What to do about codes ?????
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Pro
Joined: Jun 2001
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From: Summerville SC
What to do about codes ?????
99 FRC, 6spd, twin flow intake, otherwise stock. Started getting the "ENGINE" light, car runs fine, although my wife is worried about the light. The codes are P0113 and P1111 which are... Intake Air Temperature (IAT) Sensor Circuit High Voltage and IAT Sensor Circuit Intermittent High Voltage. What do I do about these? Will they affect anything? Can I make the Check Engine light quit coming on? :confused: Thanks in advance, Jake
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Re: What to do about codes ????? (ChasNMe)
ChasNME
Do the basic checks first. Check the plug on the sensor. Remove the plug, check for moisture, dirt and make sure it is plugged in all of the way.
It could also be a bad sensor. You can check the sensors resistence with a Meter. It will vary with the air temperature. There is a chart in the tech manual that shows the readings vs temperature i.e. 75 degrees = XXXX Ohms, 60 degrees= XXXX ohms ect ect.
I am at work and my book is at home or I would post the entire chart.
Do the basic checks first. The sensor is located on the plastic air bridge assembly that is attached to the top of your radiator shroud. The two wire plug and sensor is on the drivers side. You can also remove the sensor from the intake and make sure it is not dirty, oil soaked (if you installed a oil gause filter).
Good luck
Bill
Do the basic checks first. Check the plug on the sensor. Remove the plug, check for moisture, dirt and make sure it is plugged in all of the way.
It could also be a bad sensor. You can check the sensors resistence with a Meter. It will vary with the air temperature. There is a chart in the tech manual that shows the readings vs temperature i.e. 75 degrees = XXXX Ohms, 60 degrees= XXXX ohms ect ect.
I am at work and my book is at home or I would post the entire chart.
Do the basic checks first. The sensor is located on the plastic air bridge assembly that is attached to the top of your radiator shroud. The two wire plug and sensor is on the drivers side. You can also remove the sensor from the intake and make sure it is not dirty, oil soaked (if you installed a oil gause filter).
Good luck
Bill
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Re: What to do about codes ????? (Bill Curlee)
Woops, I forgot to answer the other part of your question.
WILL IT HURT ANYTHING?
I think the IAT plays a part in determining your air fuel ratio, but I know that it effects your timing. How much, I dont know. You can still drive it but it may mot be at the peak performance level.
Bill
WILL IT HURT ANYTHING?
I think the IAT plays a part in determining your air fuel ratio, but I know that it effects your timing. How much, I dont know. You can still drive it but it may mot be at the peak performance level.
Bill
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From: Summerville SC
Re: What to do about codes ????? (Bill Curlee)
thanks bill, i will check when renee gets home
what if i find nothing, though? ie - everything looks good
can you post the resistance readings later or email me?
thanks, jake
jakereneej@comcast.net
what if i find nothing, though? ie - everything looks good
can you post the resistance readings later or email me?
thanks, jake
jakereneej@comcast.net
Melting Slicks
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From: Central NJ
Re: What to do about codes ????? (ChasNMe)
The wires leading to the sensor are infamous for breaking inside the insulation. They are a little short from the factory, and do eventually break. I'd bet that replacing the plug pigtail and soldering it in will get rid of your problem. The wires fail much more often than the sensor.
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Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Re: What to do about codes ????? (NJVetteGuy)
I agree :iagree: .. Check that first. The factory manual says (ignition OFF) to remove the plug from the sensor and using an ohm meter measure the wiring harness plug terminals C1-24 to C2-24 and you should read 0-5 ohms. If you read infinite then you have a break in the wires back to the PCM. If it reads good, I would suspect the sensor. Try this: Using the same ohm meter read the sensor when it is cold. Use a hair dryer and blow hot air on the sensor element. you will/should see the resistance readings change smoothly as the temp increases and smoothly as the temp decreases. If that happens then the sensor is probably good. Like previously stated I have not seen many IAT sensors go bad.
There was not a chart in the manual that I could find. Sorry.
There was not a chart in the manual that I could find. Sorry.
