Hello I've got a 2000 town and country with a 3.3 I had a code p0118 so i changed the temp sensor and I still have the code. I have a auto exray scan tool and it wont reset the code. What else can I try to reset? I tried taking the battery post off and that didn't work either. Thanks alot
Hi Kev2 thanks for the reply no other codes, what should the voltage be? I had a A C problem the compressor came on but no fans. With this code does the fans stay on? It was low on gas but know i'm thinking since the fans are running all the time that's why the A C is working. Does this code effect the gauge also? Hey buddy any light you can shine an this problem is great this is the wife's ride. Oh and by the way if you have kids Happy Fathers Day!
this code will affect the fans, A/C, and gauge. sensor has 2 wires- unplug and check harness wires- I added the wire colors to confirm TN/BLK - sensor signal- post voltage @5v BK/LB - ground - check for any unexpected vo;tage and then confirm grnd. connect sesnor what is voltage on the ground BK/LB wire? PS: will your scanner read ALL codes? Esp the manufactures specific the P0999 and above?
Hi Kev thanks for the reply I hope your fathers day went well. I checked the voltage like you said, unplugged it was 5.01 with the engine off, I plugged it in and with engine off it was 5.01, with the engine running it is 5.00 both plugged in and unplugged. You said to confirm ground I'm not sure what you meant so I went from the neg on the plug to batt positive and it was 13.00 volts. I hope this is what you wanted also the engine light is off just with the key on and when you start the engine the light comes on. I'm not sure what all this meter will read its a code scout 2500 auto xray. Thanks alot Ron.
Hay Kev I looked up the code scout 2500 autoxray scanner they said it would scan the manufactures specific codes and will also erase.
the scan tool wont clear code?get in contact with scan tool company.code will clear itself after so many ignition start ups if fault is not seen.P0118 means pcm sees over 3.9 volts on the signal wire.can be caused by a bad ect/open signal wire/open ground or a connector contact issue at the ect.being you have 5 volts on signal wire at the ect that would rule out open signal wire.Do you have data stream on scan tool?if so does it read ect volts or temperature?do this take a tpin or something to backprobe the ect connector while it is connected....take neg meter lead to neg battery terminal now backprobe one of the ect wires at connector with connected and touch the pos meter to this tpin now do the same to other wire....what readings did you get?if you had data stream some checks we can do.
What I am thinking- always easy simple first- we are getting rhe reference 5v at the wire. good- I think we need to double check the connector- thinking is the voltage is NOT getting to sensor- wire contacts etc OR the sensor is bad - I think what Auto joe suggested is - using a pin as a probe to pierce the wire - confirm the 5v with the probe - then pkug in harness to ECT - what is the voltage then? It should drop below the 3.9v - shake the connector- wiggle wires - to confirm contact.
No I am not trying to verify 5 volt feed. If you understand how a thermistor circuit works and pcm voltage sensing circuit you would understand. I need exact voltage measurement like I explained above please. Thanks
Thanks guys for your help I took a hair pin and put my positive lead on the tan with black strip at the plug and I put my neg lead on the batt the voltage was 5.03 with the key on engine not running and the plug on the sensor. Then I put the neg lead on the black with white strip on the plug and the positive lead from my meter to batt positive and the voltage was 12.10 with the key on engine not running and the plug on the sensor.
Then I put the neg lead on the black with white strip on the plug and the positive lead from my meter to batt positive and the voltage was 12.10 with the key on engine not running and the plug on the sensor. do this take a tpin or something to backprobe the ect connector while it is connected....take neg meter lead to neg battery terminal now backprobe one of the ect wires at connector with connected and touch the pos meter to this tpin now do the same to other wire....what readings did you get?
Hi autojoe I put my neg meter on batt neg and the positive on the bk/lb the volts is .021 then I put the pos on the lb/blk the volts is 5.03
if you would have had 5 volts on each wire backprobed key on then open ground.being you have under 100mv ground to ground voltage drop on ground circuit and a 5 volt feed on thermistor signal wire at thermistor you either have a bad thermistor or a connector issue.with neg meter hooked to battery negative terminal and pos meter hooked to thermistor wire backprobed at connector start van and monitor the voltage on the signal wire on meter.engine cold should have 2.5-4.5 volts and engine hot .5-1.5 volts.wiggle connector and see if the signal voltage changes.check the ect connector terminals.the voltage should be high engine cold and be pulled to ground and lower as coolant temperature increases.you should never see 5 volts on signal wire with it connected....engine cold...should be under 5 volts.
Hi autojoe thanks for the info I replaced the connector and bingo no code and for now all is well thanks again Ron.
thanks for letting us know the fix.glad you got it fixed.
Your welcome this site was a big help, you helped save me alot of money lol. Thanks again Ron
there is NO code that says change a component. THIS code is for a WIRING problem on the ECT sensor circuit- you could install 100 sensors and it will not help. you need to check the wiring from the sensor to the PCM. what is the voltage on the sensor wires- plugged in and unplugged Any other issues - something NOT working- cruise - AC? other codes - can you read codes P0999 and up?