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Posted: 08/07/08
05:38 PM
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I have a 1997 Jeep Cherokee that keeps spiting out a P0113 Intake Air Temperature Circuit High Input. I recently installed a Edge Trail Jammer kit. The light was on before that though. I replaced the sensor and tried it with out the chip hooked up with no luck. Any advice?
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mudb8-
Moderator
| Posts: 3112
| Joined: 08/07
Posted: 08/07/08
05:48 PM
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it may not have reset,
I don't think the trailjammer modifies the intake air temp reading..
I had a diode to mod the temp at one time, it caused the thing to quit completely untill I threw it away. what a joke....
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ftgiles
Guru
| Posts: 1250
| Joined: 05/08
Posted: 08/08/08
07:44 AM
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High voltage detected from a sensor indicates a break in continuity. Causes are a bad sensor, a bad connector, or a bad wire.
The sensors are just a varible resistor in the path to ground. The resistance is measured by the PCM and used as an input reference.
Since the IAT sensor is new, lets assume it tests out ok. You should always test the sensor before replacing it though.
Unplug the IAT sensor connector.
The PCM is located on the left front inner fender.
Located on the PCM are three connectors. They have a collored clip ring, black, white, and gray. Unplug the black one. These are the "A" cavities. A-15 is the pin for the IAT. A-15 is in the middle row, they are numbered, look close.
Test the A-15 pin and the C-2 pin on the IAT sensor connector (BK/RD wire) with an ohm meter. There should be no resistance (100% continuity, less than 1 ohm).
Test the A-4 pin and the C-1 pin on the IAT sensor connector (BR/YL wire) with an ohm meter. There should be no resistance (100% continuity, less than 1 ohm).
Also, inspect the IAT connector to make sure there is a good connection to the IAT sensor. You might need to slightly twist the IAT terminals to make a good connection.
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ftgiles
Guru
| Posts: 1250
| Joined: 05/08
Posted: 08/08/08
08:14 AM
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A note on testing. Use a paperclip to probe the connectors. The probes on testers are too thick to fit down in the connectors. Have someone help you so you can make sure good contact is being made.
After you plug the IAT connector back on, test A-15 and the negative battery terminal. You should see resistance. The resistance should be 5-10k ohms for a cold engine and a 80 degree day. More ohms if it's cooler, less ohms if it's warmer.
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