Coolant Temp Sensor Cause No Start

I had my vw shop replace the fuel pump and it was free since there was a fuel pump recall that affected my model. now it starts but when accelerator is touched even slightly it splutters and carries on and stalls, like its getting to much fuel or. - Coolant temp sensor reads normal 80 - 90C, 2. So your low coolant (antifreeze) light came on and your coolant level is low. 8 volts or below. When a coolant temperature sensor fails (open circuit / no continuity) the high / infinite resisitance will cause the ECU to falsely read the max low temperature of -40 degrees F. It is likely that the problem may be a loose, corroded, or faulty connection and not a problem with the sensor itself. injector pulse is present during crank but disappears after cranking engine 3 pin ect connector is damaged cannot find a pinout for ect connector no pulse occurs with ect disconnected. Posted: Wed Aug 24, 2016 7:22 pm Post subject: rough cold idle/start, coolant temp spikes, and surging idle '84 Vanagon GL Wolfsburg with 2. It screws into the intake manifold by the Thermostat. A cold engine requires more fuel. the coolant temp. Coolant temp sensor troubles. My question is where is it at in my 98 contour se? I see there's one sensor near the engine that goes into the coolant hose that has two wires but someone said that's not the one. I don't know what software he is using (anyone have any ideas?) but I do know that an OBD2 reader can be got off ebay very cheap. The engine light intermittently goes on advising me to check the engine coolant. A coolant sensor is capable to give a temperature feedback from neg 40 degrees to above 280 degrees. Coolant Level Sensor (CLS) - The CL sensor monitors the level of the coolant in the radiator surge tank. Sensor Input Voltage High 24 Fuel Temp. And though high heat can be caused by numerous things, it's the job of the EOT sensor and the engine coolant temp sensor to detect these conditions and let you know about it before things get to that critical stage. This decreasing resistance now lets more of the 5 Volts to pass thru' the sensor onto ground. A coolant temperature sensor is a vital part of an automobile engine's cooling system. If you start having trouble starting your vehicle after it has reached its normal operating temperature, this is usually a very good sign that you need to have the coolant temperature sensor checked. You may need a coolant sensor, butiof that’s what were causing the no start condition you’d be experiencing it in the morning too. I suspect the coolant sensor he’s referring to is the one that provides the engine temp sensor to the ECU to get the proper metering for the engine’s temp condition. The engine does not need to be run until the coolant temp comes to normal. Often this code causes the Check Engine light to come on and off in cold temperatures. Another telltale sign of your coolant temperature sensor not functioning properly is if your engine is overheating frequently. This sensor is responsible for causing a computer malfunction which can cause the check engine light to come on. Looking for a new clutch Looking to quiet down/remove rasp from 4cyl exhaust Coolant temp sensor 2. See here for a step-by-step guide on how to diagnose and fix check engine light code P0118. now it starts but when accelerator is touched even slightly it splutters and carries on and stalls, like its getting to much fuel or. The good rule of thumb here is to get the Air Temperature at 100° F below the Coolant Temperature readings after warmup. Most (ECT) sensors operate using electrical resistance to measure the temperature of the coolant. Fuel Temperature Sensor (FTS) - The thermistor FT sensor monitors fuel temperature and is mounted on the fuel distribution block. I'm in agreement with the previous answer. The Engine Coolant Temperature Sensor (“ECT” for short) is an analog sensor which, as it’s name says, measures the temperature of the coolant and feeds this data to the on-board computer. also could this the trans. With no air in the system, the temperature started flickering again once up to temperature (it has only done this behaviour in the high 70s/80s, but not all the time - sometimes it sticks as if the car is simply underheating). The car may not pass emissions testing. A coolant temperature sensor is a vital part of an automobile engine's cooling system. The water coolant temperature sensor seemed ok, did not check to be bad. I plugged it in and the car wouldn't start. Can a bad coolant temp sensor cause engine flooding? Problem: 96 Saturn SC2 starts up fine, but bogs down after ignition and requires some gas to keep it alive. Typically the temperature readings should be 10 degrees more or less than the vehicle's ambient temperature depending on the outside temperature and the temperature of the engine. Do you know of how to get rid of moles fast and easy? The best methods of how to get rid of mice in your house. Replace crank sensor,fuel pump checked fuel injectors,after a few attempts to start,security light is on, will leave it alone for awhile,starts right up. If I remember right on the Celect N14 the only immediate shut downs are low oil pressure, low coolant, and high coolant temperature. The sensor works best above 600F, so modern cars have a heater element to bring it into operation faster, to reduce emissions and improve gas mileage. If you would like to see more technical Pelican Technical Article: BMW E30 Coolant Temp Sensor Replacement Page 1 of 12. Just making sure its likely this sensor (on the head, not rad) before i swap her out. After 10-20 seconds of the gas being slightly stepped on, it idles 'unsteady'. Disconnecting coolant temp sensor will start but runs cooling fan & drains its power. With a lab scope a coolant temperature sensor is measured from an engine in a warming up stage. p1299 is head temp sensor code, CHT(cylinder head temp) sensor Not related to coolant temp sensor(ECT) You need to ask for a head temp sensor, if you ask for a temp sensor you will always get the ECT(engine coolant temp) sensor from a parts guy Google: 2010 ford Ranger 2. This will then translate to how the engine runs. Leave the bleeder screw alone. 1L engine is located under the air conditioning compressor. With AutoZone's great selection of coolant temperature sensors, you can easily find the perfect sensor for your exquisite ride to avoid overheating, even on the hottest of days. This is a given, since the engine is running a rich fuel mixture or is in open-loop mode. Could a bad cylinder head temperature sensor cause hard starting from cold ? About 5 days ago I came out of the gym and got in my car, it has been parked for about 2 hours, As soon as I put my key in ignition the temp gauge needle went right into red, then bounced to the bottom, I started the engine and the temp gauge shot into red, then bottom, then red, then bottom, as I started driving the. Any other thoughts? (Drove car into garage one day - - next morning cranking but not even attempting to start. not sure if the temp sensors etc, would cause a no start issue. No the o2 sensor will not cause a no start problem. This sensor resolved my issues on a 2003 f150 XLT 4. Could my Engine Coolant Temp Sensor Cause my car to rev up to almost 2600/3000 Rpm Sitting Idle in 1st Gear waiting to turn. The temperature marked on the thermostat is a temperature at which the thermostat should start to open While discussing coolant changes, Tech A says that the old coolant can simply be poured down the drain. The cooling fan(s) should come on at approximately 92 °C to reduce coolant temperature. Code P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Open Problem. The fans don't come on when the engine is at full temperature either. DTC P0116 diagnostic will not execute unless: there are no IAT (Intake Air Temperature) DTCs (P0112 or P0113) sensor faults, there are no engine coolant sensor high or low input faults (P0117 or P0118), the ignition off timer has not failed (DTC P1683), and the startup IAT is greater than a calibrated value. If we add to the car’s makeover a new radiator of different design, a different cooling fan, and a new Water Temp gauge—then it will be a very good idea to verify accuracy of the new water temp gauge. A coolant temperature sensor is a vital part of an automobile engine's cooling system. You may need a coolant sensor, butiof that's what were causing the no start condition you'd be experiencing it in the morning too. No still no joy,although i t seems the garage i used to use have bodged the wiring on the coolant temp sensor,removed the original electrical connector and connected with spade crimps! Starting to wander if because of this,the terminals could be shorting. Start the engine and allow it to run at idling speed. Basically, the ECT is a thermistor which changes its resistance based on the coolant's temperature it's connected to. Will a faulty engin coolant temp sensor cause no start on 2001 Chevy blazer? Yes it sure can. This sensor resolved my issues on a 2003 f150 XLT 4. I would suspect a faulty sensor, but it was replaced. On this Passat the temp reading goes from cold start up (cold engine), to normal 190F as the thermostat opens. The coolant temperature sensor can be purchased at most (if not all) auto parts stores (depending on your make and model regarding immediate availability. A no-start condition is one of the most frequently encountered engine problems. The coolant temp sensor is pretty cheap, no harm in replacing it if it makes you feel better. The engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. no models or model years listed. The coolant cap must be screwed in place - Crimp the both connectors to two wire ends and isolate the open metal sorface with shrink tube - push crimp connectors on the sensor spades and see for no short circuit and tight fitnent. A/C Condenser Fan Relays No. If pushing on the sensor had an effect i would be leaning towards the electrical connection to the sensor. TT (Mk2) Discussion - Can faulty temperature sensor cause a no start!!! - I have an ongoing problem with my mk2 tt 3. And yes, when the blue temp sensor is out of whack, the DME goes full rich and will flood the car on cold start-up. first of all check the plug of the ECT(engine coolant temp) sensor, it used to slacken and corrode, if it's ok put a new genuine sensor, as it's not expensive and even if it works they used to loose qualities in time and mixes up the management, it might be the cause of both your issues together, this sensor is more important than it seem for. This decreasing resistance now lets more of the 5 Volts to pass thru' the sensor onto ground. However, most people don't realize that the temperature sensor may be malfunctioning. A coolant temperature sensor is a vital part of an automobile engine's cooling system. The conditions for setting this code are: engine running at least 40 seconds and no code 21 or 22 (TPS errors) present, and coolant temperature is at least 118 deg F (48 deg C), and. If, after sufficient time has passed, the sensor still reports that the engine is not warm enough for closed-loop fuel control, the ECM interprets this as a fault in the sensor or cooling system and sets a Detected Trouble Code (DTC). Now the needle on the dash (for NORMAL) is on the N (tachometer cluster) or the L (on non-tachometer cluster). phishfood4311 · Registered. I would check the coolant temperature resistance at that temperature, since it has greater relevance. And though high heat can be caused by numerous things, it's the job of the EOT sensor and the engine coolant temp sensor to detect these conditions and let you know about it before things get to that critical stage. It was definitely the ENGINE CYLINDER HEAD TEMP SENSOR NOT to be confused by the ENGINE COOLANT SWITCH/SENSOR as other peeps may have suggested. I have looked on ebay and the temp sensors pictured have two pins. This means that the ability to write new posts and access various member features will go away. (I believe the securing clip won't go on properly/will break if the sensor is not inserted all the way). The root cause of the issue pointed back to the Chevrolet coolant temperature sensor. I tried unplugging the temp. The readings from this sensor are then fed back to the Engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing. Then slowly add clear, drinkable water to the system until the level of the coolant mixture has reached the base of the radiator neck or the level indicator on the surge tank. Everything went fine, other than a little trouble getting the metal bracket that holds the wire & hoses in place off and out of there. 2002 and older vehicles had a bad coolant temp sensor from the factory that VW updated. Next problem, brake light switch. 3 Jul 2017 If you look down at the gauge, and see the coolant temperature needle is in the red, pull the car over, put it in park, and—unless you see lots of 29 Jun 2018 But a faulty engine coolant temperature (ECT) sensor can cause havoc on an Once the car is warm, it switches to relying on the oxygen sensors for a engine may misfire and run. For your reference there's a switch sensor that is actually on the radiator, near the lower hose. both cooling fans turn on at full speed about 5-10 seconds. This code is thrown when the resistance coming from the coolant temp sensor does not change as the vehicle warms up. • Engine coolant temperature sensor • The sensor for the intake manifold air temperature • The sensor for the intake manifold pressure • Speed/timing sensors • Throttle position sensor At engine start-up, the ECM determines the top center position of the number 1 cylinder from the speed/timing sensors. The coolant temperature (black) sensor seems a bit low if the temperature actually was 64 degrees Celsius. Could a defective coolant temperature sensor cause hard starting when an automotive engine is cold? I have a 1992 Ford Escort with a 1. 2002 V40 Coolant Temp Sensor issue Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. I would start by popping the I would start by popping the hood open, and checking your coolant level. Because high engine oil temperature can be lethal to many of your 7. 12C engine coolant temp when the engine is warm, around 90C. Jeep Grand Cherokee P0118 Symptoms. I've replaced the coolant temperature sensor twice thinking that maybe it was a defective new part from AutoZone. He did not bled it till he saw bubbles in the raidiator but said that my head casket may have a pin hole in it that it could be why the low coolant light keep coming on anyway told me to try out the sensor and see if it will go back on so far i have done 400 miles on the new sensor and it has not come on yet. This happens if the engine is extremely hot. This particular coolant temp sensor fits most current model VW and Audi models (listed below). i have a bad coolant temp sensor, not sender. I pull the code P0380: P0380 - Glow Plug/Heater Circuit 'A' Malfunction. One sensor (2 wire) is for the ECM. The combination 4-pin sensor is located on the coolant outlet on the side of the cylinder head. Your engine is pretty hot stuff, but if it gets too hot, you're going to start to have problems. If the EGT sensor(s) are unplugged and an attempt is made to turn the key on or start the engine the PCM will disable the starter and not allow the engine to crank. I checked all the hoses, fuel pressure, mass air sensor, and coolant temp sensor. Japanparts Coolant Temperature Sensor - null Select a new country:. its got a single wire going to it spade connection looks like most temps sensors. The readings from the (ECT) sensor are sent back to the engine control unit (ECU). I have heat and there is ample coolant in the engine. Sensor Input Voltage Low 25 No Active Codes. Could overheated engine cause coolant temp sensor to go bad?. Code 43 is set when: Voltage at Knock Sensor is above 4. The computer in every fuel-injected car must know two things before it can figure out the correct cold-start air/fuel mixture: the engine coolant temperature and the outside air temperature. WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. Nitrogen , Jul 4, 2019. You will have to explain to me how the battery will fail due to "no coolant" as there are OTHER DTCs and OTHER driver warnings for incorrect coolant inlet-outlet temperatures (and BICM cell group temp probes as well) that are designed mitigate any potential damage via "reduced propulsion power" if necessary. If the ecm is "seeing" a high temp then it will lean out the fuel sent to the injectors, causing a hard start when cold. You may need a coolant sensor, butiof that's what were causing the no start condition you'd be experiencing it in the morning too. Yes, a bad Coolant Temperature Sensor could cause a no start or hard start situation. Should test normally open unless heated to 200 to 220 degrees (my estimate) if its closed at room temp it may need replaced. Until the engine reaches operating temperature the computer is in "barefoot" mode. To confirm, you could run your vehicle through an emissions test. With a lab scope a coolant temperature sensor is measured from an engine in a warming up stage. 1 for AC one for the ECU and the other one im not sure of. Most (ECT) sensors operate using electrical resistance to measure the temperature of the coolant. coolant sensor (or sensor circuit) can cause a variety of cold performance problems as well as emission failures. If I park in the shade or raise the hood it restarts soon. why does my coolant temp sensor cause high idle? If the sensor is plugged in when I start it, it idles above 2000 rpm. feeding it coolant but it does not want to keep it even though the cold level in the res is at the bottom when I checked the car cold. The good rule of thumb here is to get the Air Temperature at 100° F below the Coolant Temperature readings after warmup. In later 940s, the coolant fan is controlled by either the high and low pressure air conditioning sensors on the condensor outlet and the ECU block temp sensor: there is no independent radiator fan sensor. There was also a check engine light, but that went away on its own too. 1 for AC one for the ECU and the other one im not sure of. If the reading is not way lower than 2000ohm, you have a broke coolant temperature sensor. 1) Have a look at the 01-Engine, Measuring Value Block Group [004] field [3], this will display the engine coolant temperature, value comes from the G62-Coolant Temp Sensor. The coolant temperature sensor plays an important role in monitoring the performance of the coolant and takes measurements of the temperature. I have a new sensor, if you need me to snap a pic of it if it will help your search. You should perform these tests in sequence, unless otherwise stated. I've replaced the coolant temperature sensor twice thinking that maybe it was a defective new part from AutoZone. Sensor Input Voltage Low 16 Coolant Level Sensor Input Voltage High 17 Throttle Valve Position Sensor Input Voltage High 18 Throttle Valve Position Sensor Input Voltage Low 21 TPS Input Voltage High 22 TPS Input Voltage Low 23 Fuel Temp. P0117 ECT Sensor Circuit Low Input OBD-II Trouble Code Technical Description. Press the key again to unlock the screen. I think if the sensor is not fitted correctly you'll be spewing coolant from that point. 84 Chevy pickup coolant sensor 6 cly location? Faulty engine coolant temp sensor. Code P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Open Problem. It is not uncommon for the coolant temperature sensor to fail and send a permanently cold signal to. Does anyone know if a faulty coolant temperature sensor would be a possible cause for the car not starting (1999 with 1. The car may not pass emissions testing. The readings from this sensor are then fed back to the Engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing. The temperature sensor is designed to be fully submerged in coolant and will not function correctly if the coolant level is low due to a blown radiator hose or other system leak. Start with the radiator cap and the radiator filler neck. The first fault code listed below "P1281 - Performance Malfunction in Cooling System" more commonly is related to a bad thermostat. The Engine Coolant Temperature Sensor (“ECT” for short) is an analog sensor which, as it’s name says, measures the temperature of the coolant and feeds this data to the on-board computer. If you have to remove the throttle body, no need to drain the cooling system as the factory service manual suggests, simply insert a bolt or stopper into the small coolant line that attaches to the throttle body (keeping the radiator cap in place) and you'll only lose a little bit of coolant, replace it when finished. Jump to Latest Follow 1 - 5 of 5 Posts. Changing the Engine Head Temperature Sensor has exorcised all of my car's gremlins in one fell swoop. I pull the code P0380: P0380 - Glow Plug/Heater Circuit 'A' Malfunction. P0117 ECT Sensor Circuit Low Input OBD-II Trouble Code Technical Description. Worked great. Difficulty in hill inclines. So my engine coolant temperature light has been on for the past 4 days thing is radiator is full with antifreeze,coolant reservoir is at the full mark when warm,car doesnt have steam coming out anywhere, no over heating,and heat blows hot what can it be? i bought a new coolant temp sensor cause thats all i can think of thats causing the light to come on but havent installed it yet due to the. Before the automated systems in vehicles, this was the sole purpose of the choke. Technically speaking, you can remove the sensor, take it to your kitchen and heat it on your pot of water. 0 powerstroke. A bad engine coolant temperature sensor affects engine performance: It may cause a constant lean air/fuel mixture, causing the. 9L VP44 Electronic Troubleshooting & Repair Manual. My temps hover within 199-209 when warmed up (5. Cadillac SRX P0118 Symptoms. Bad Coolant Temperature Sensor Symptoms. The coolant temperature sensor is what tells the car's computer what the engine's running temperature is. If you feel little to no heat from the heater, then it’s a pretty good indication that the thermostat is the problem, and not a wiring issue. The computer uses a coolant temp sensor that is separate from the coolant sensor for the dash gauge/light. I suspect the coolant sensor he's referring to is the one that provides the engine temp sensor to the ECU to get the proper metering for the engine's temp condition. A bad coolant temperature sensor is something that is really easy to diagnose without using a multimeter. I have had start /run problems with bad ECu sensor never an overheat A bad ecu temp sensor if always showing cold would keep comp. The O2 sensor can be used to correct small discrepancies between the aim AF mixture and the actual AF mixture, but does not play a large role in determining the amount of fuel to inject. The water coolant temperature sensor seemed ok, did not check to be bad. 15 Oil or Coolant Temp. Automotive engines rely on electronic devices, such as oxygen sensors, to help a car to efficiently. The readings from this sensor are then fed back to the Engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing. Do not remove the radiator cap when the engine is hot! Inspect for warped belts and leaking hoses. Figure 2 Step Up Resistor ECT Circuit. Clean contact pins with a solvent to remove tarnish marks (this may cause a resistance). With AutoZone's great selection of coolant temperature sensors, you can easily find the perfect sensor for your exquisite ride to avoid overheating, even on the hottest of days. No Start Condition SYMPTOM PROBABLE CAUSE SYMPTOM Little or No Cold Air External temp. The water temp sensor (THW) that signals the ECU what the coolant temp is is the same fitted to all Starlet EP8* and EP9* series engines with the exception of the Glanza V. make sure there is proper resistance if you bench test it. With a lab scope a coolant temperature sensor is measured from an engine in a warming up stage. The ECT sensor resistance will appear high when the coolant temperature is low and vice versa. I tried unplugging the temp. Out of shear blind luck, I decided to replace one sensor, the engine coolant temp sensor(it may be the engine temp sensor in the runner, may make a difference). No more stalling, surging, hesitating or hard starts. com theres a temp sender and a temp sensor I'm guessing its the temp sensor? Thanks for anyones help. Coolant Temperature Sensor Circuit Engine Difficult to Start or Will Not Start (No Exhaust Smoke QSB 5. 12C engine coolant temp when the engine is warm, around 90C. I have been reading on here recently that the Engine coolant temp sensor could be the culprit. It is installed into a water jacket at the front of the cylinder block. I don't feel like replacing the coolant sensor just yet (should be able to just test the current one), so I'm going to see what trouble codes show up when connected to the computer. I replaced the thermostat, coolant temperature sensor, and gasket. Don't buy the sender for the gages. These crystals can attach to the internal cooling system parts and cause problems on the long term. Sensor Input Voltage High 24 Fuel Temp. could that cause my tranny to not lockup the torque converter? 93 grand cherokee 46rh trans could bad coolant sensor cause this? - JeepForum. air charge temp sensor reads the outside air to mix up the right fuel gas ratio will make the vehicle real hard to start. I do not know what effect the coolant temp sensor has on the 6. This is why the fans go on. The computer is calculating an air/fuel mixture that is too lean. There was also a check engine light, but that went away on its own too. In worse cases, it would not start at all. The water coolant temperature sensor seemed ok, did not check to be bad. Apparently the crankshaft sensor is unlikely to be the cause and neither the heater plugsthis from someone who knows these cars quite well. If the fan does not come on then you could be over heating and when your on decel the light will come on while the overheated coolant goes by the sensor the shuts off because the coolant has cooled enough to shut it off. You can usually locate your coolant temperature sensor on or near the thermostat housing. 3 GoWesty engine. With a lab scope a coolant temperature sensor is measured from an engine in a warming up stage. In worse cases, it would not start at all. neither should give you any driveabilty problems especially not being able to rev over 2krpm. Start the engine and allow it to run at idling speed. TT (Mk2) Discussion - Can faulty temperature sensor cause a no start!!! - I have an ongoing problem with my mk2 tt 3. sensor is what cause fan to run at certain temperature. Seems to be an issue with the air temp sensor, the coolant sensor or the ecm, as these are all connected. I discovered disconnecting the electrical lead to the temperature sensor in the air cleaner box allows the car to restart and perform normally. The ECT works by changing its internal resistance according to coolant temperature and therefore also changing the voltage drop across itself. Everything went fine, other than a little trouble getting the metal bracket that holds the wire & hoses in place off and out of there. The water temp sensor (THW) that signals the ECU what the coolant temp is is the same fitted to all Starlet EP8* and EP9* series engines with the exception of the Glanza V. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. 1) Have a look at the 01-Engine, Measuring Value Block Group [004] field [3], this will display the engine coolant temperature, value comes from the G62-Coolant Temp Sensor. As an engineer this raises a couple questions: 1. 12C engine coolant temp when the engine is warm, around 90C. Though high idle may be caused by a bad coolant sensor, there may be another cause of this. I tried doing a search on this, but that stupid new google search goes through every forum and it gives too many results :/ sorry if this is a repost. Ensure the coolant level is at the proper level. Car low on power but will reach 80mph on level roads. Also, your sure its your water temp light? not your charge pressure light or hydraulic temp light? Some machines used 1 warning light for multiple functions, I can't say for Case for sure. The car will start and drive fine, but when kicked, hit, or a door slammed, then temp will spike all the way up and the engine will stall. First time it's happened. So he is gonna get another one from Vauxhall and fit it to see if that sorts it. On 1993-95 vehicles, terminal 2 (ground) is brown, and terminal 4 (signal) is blue/white. if all is good. I would like to be able to get the coolant temp so I can build an alarm based on coolant temp. In worse cases, it would not start at all. The fans seem to run but they are running slower and quieter then I remember, the oil is clean, and there is no sign of coolant in it. Running the KOEO self test will run the main fan (pass side) and the aux fan (drive side) briefly at the start of the test. My coolant temp sensor is on perminantly however the temperature is where is should be i have replaced the sensor to no evail. / can the coolant temperature sensor cause my AC I don't have an answer,but my 2005 f150 has the same problem. See here for a step-by-step guide on how to diagnose and fix check engine light code P0118. 7 liter engine 6 cylinder. One of the first symptoms associated with a problem with the coolant temperature sensor is poor fuel economy. If you start having trouble starting your vehicle after it has reached its normal operating temperature, this is usually a very good sign that you need to have the coolant temperature sensor checked. no models or model years listed. the coolant temp. Can a bad coolant temp sensor cause the car to not start? So i replaced alot of stuff over the past month on my 240sx. If you are experiencing coolant loss in the form of a leak, refer to the “Coolant Loss” symptom on this site. Have your computer codes pulled for starters, then start testing. When a coolant temperature sensor fails (open circuit / no continuity) the high / infinite resisitance will cause the ECU to falsely read the max low temperature of -40 degrees F. check to see if there is debris blocking it or keeping it from closing. For instance if the sensor has an open in the wiring or the sensor itself the ECU will see that the engine is -60 degrees farenheit and will richen the mixture way too much. And yes, a bad coolant temperatue sensor can cause starting problems, but so can many other things. If you have to remove the throttle body, no need to drain the cooling system as the factory service manual suggests, simply insert a bolt or stopper into the small coolant line that attaches to the throttle body (keeping the radiator cap in place) and you'll only lose a little bit of coolant, replace it when finished. Lower Your Coolant Temperature High temperatures can cause lots of problems. This is why the fans go on. The coolant temp sensor is pretty cheap, no harm in replacing it if it makes you feel better. This code is thrown when the resistance coming from the coolant temp sensor does not change as the vehicle warms up. The computer then uses this data to maintain optimum driveability especially while the engine is warming up and until it reaches operating temperature. mini: the engine thermostat housing had poor solder contacts in coolant temperature sensor which caused a no start, or hard, long crank start of a cold engine. when this sensor went bad on my engine i was not running rich, i just could not start the engine when it was already warm because it was being flooded. -If the contacts on the NTC coolant temperature sensor are tin-plated then replace with a new NTC sensor with gold-plated contacts. The coolant temperature gauge and LED on all 1983-1991 Vanagons are comprised of four main components: 1) The gauge and LED itself in the dashboard 2) The coolant temperature sensor on the thermostat housing on the engine a. The diagnostic procedure for detecting a bad coolant temperature sensor is relatively a quicker task. I replaced the thermostat, coolant temperature sensor, and gasket. I used some regular teflon tape. Engine Watchdog TM1 is an Audible Engine Temperature & Low Oil Pressure Protection Alarm which monitors and displays your true engine temperature. Typically the temperature readings should be 10 degrees more or less than the vehicle's ambient temperature depending on the outside temperature and the temperature of the engine. Most (ECT) sensors operate using electrical resistance to measure the temperature of the coolant. I logged it too with VagCom and seems to be a correct measure compared with the cluster needle too. Quite clearly the resistor mod is a dangerous idea, a temperature gauge that rises to 90c normally is fine but one that stops there no matter how hot the coolant becomes is actually worse than. As a result, the engine would not start as easily as it should. With AutoZone's great selection of coolant temperature sensors, you can easily find the perfect sensor for your exquisite ride to avoid overheating, even on the hottest of days. All of the previously mentioned topics can affect the operating temperature of the engine coolant. My temps hover within 199-209 when warmed up (5. vibration, overheat, rough feeling idle, fan speed sensor code. 2000 corolla crank no start need to know if coolant temp sensor disconnected will cause no injector pulse. On all 1993 and later engines, the coolant temperature gauge sensor is integrated into the coolant temperature sensor for the ECM. make sure there is proper resistance if you bench test it. The coolant temperature sensor can be purchased at most (if not all) auto parts stores (depending on your make and model regarding immediate availability. So as a coolant temp sensor fails, its resistance to ground is increased, and the subsequent result is an increased temperature sent to the PCM. Have to check that out tomorrow. I don't feel like replacing the coolant sensor just yet (should be able to just test the current one), so I'm going to see what trouble codes show up when connected to the computer. This is a 7$ part. Changed the CTS but no lucky. If, after sufficient time has passed, the sensor still reports that the engine is not warm enough for closed-loop fuel control, the ECM interprets this as a fault in the sensor or cooling system and sets a Detected Trouble Code (DTC). This is the job of the water pump. The state of California requires that this warning be posted for people purchasing products that reside in California. Because high engine oil temperature can be lethal to many of your 7. This article does not cover any type of overheating issue. now it's not working at all!when i have driven for a while i notice erratic shifting in the gears & some loss of power. It has the most affect on mixture. when this sensor went bad on my engine i was not running rich, i just could not start the engine when it was already warm because it was being flooded. This Meyle Coolant Temperature Sensor - 4 pin (Mfg#034919369C) fits Audi 100, Audi 200, Audi 80, Audi 90, Audi C4 A6, Audi Coupe Q. injector pulse is present during crank but disappears after cranking engine 3 pin ect connector is damaged cannot find a pinout for ect connector no pulse occurs with ect disconnected. The engine coolant temperature (ECT) sensor test is simple and can help you fix your car faster. Before the car even starts the ECU will check the coolant temp, if it's a cold start, the ECU will enrich the fuel mixture to warm the car up quickly. Also on rockauto. Have your computer codes pulled for starters, then start testing. If your coolant temperature consistently runs higher than 100 °C, it's time to start looking for problems. I have found some good info relating to voltage divider circuits for coolant temperature errors,P0118 - Engine coolant temperature (ECT) sensor -high input - OBD2 Trouble Codes So I will be following some of the relevant suggestions. I unplug my coolant temp sensor and my car runs better than with it unplugged, why? 10 Answers. Just one comment, all VAG cars with a temperature gauge have a dual sensor engine coolant temperature sensor, so, if this is not working as expected, either the gauge could show wrong temperature or the engine ECU could be getting wrong temperature signal, one sensor feeds the gauge and one sensor feeds the engine ECU. Sensor Input Voltage Low 16 Coolant Level Sensor Input Voltage High 17 Throttle Valve Position Sensor Input Voltage High 18 Throttle Valve Position Sensor Input Voltage Low 21 TPS Input Voltage High 22 TPS Input Voltage Low 23 Fuel Temp. also could this the trans. Replacing the Chevrolet Coolant Temperature Sending Unit. Well, you've pretty well got the symptoms downnumber one cause of loss of heat is low coolant--you've confirmed bothI would not condemn temp sensor- it appears to be doing its job, reading liquid at times it is coolest and steam at time it is hottestI'd get after you fill it up with coolant (radiator and not just reserve tank)- that temp doesn't swing until coolant gets low again. Every time the engine would kill, the light would go out at that exact moment. I do not know what effect the coolant temp sensor has on the 6. Could a bad cylinder head temperature sensor cause hard starting from cold ? About 5 days ago I came out of the gym and got in my car, it has been parked for about 2 hours, As soon as I put my key in ignition the temp gauge needle went right into red, then bounced to the bottom, I started the engine and the temp gauge shot into red, then bottom, then red, then bottom, as I started driving the. As I drove away from the mechanic the temp gauge showed the engine heating up short of where it normally is, and then malfunctioned during the drive. Unplug the coolant temperature sensor while the engine is running.