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-   -   Two Codes HELP (http://www.jeepgarage.org/f5/two-codes-help-23865.html)

swing4terps 05-31-2011 09:37 PM

Two Codes HELP
 
Got the ole check engine light today. Checked the DTC and got two codes that aren't on the listing in the Troubleshoot forum.

P0508 and P0688?

Any help appreciated. Thanks.

robpp 05-31-2011 09:44 PM

Re: Two Codes HELP
 
P0508-IDLE AIR CONTROL VALVE SENSE CIRCUIT LOW







For a complete wiring diagram Refer to Section 8W.



When Monitored:
Engine running. Battery voltage greater than 10 volts. IAC motor operating.

Set Condition:
The PCM senses a short to ground or battery voltage on any of the Linear Idle Air Control (LIAC) control circuits for 2.75 seconds while the IAC motor is active. One Trip Fault. Three good trips to turn off the MIL.


Possible Causes

(K61) IAC CONTROL CIRCUIT SHORTED TO GROUND

(K961) IAC SIGNAL CIRCUIT OPEN

(K961) IAC SIGNAL CIRCUIT SHORTED TO GROUND

(K61) IAC CONTROL CIRCUIT OPEN

IAC MOTOR

PCM

P0688-AUTO SHUTDOWN RELAY SENSE CIRCUIT LOW







For a complete wiring diagram Refer to Section 8W.



When Monitored:
With ignition key on. Battery voltage greater than 10 volts.

Set Condition:
No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault. Three good trips to turn off the MIL.


Possible Causes

(A924) FUSED B+ CIRCUITS

(A142) ASD RELAY OUTPUT CIRCUIT OPEN

ASD RELAY

PCM

robpp 05-31-2011 09:46 PM

Re: Two Codes HELP
 
IAC = Idle Air Control

swing4terps 05-31-2011 09:49 PM

Re: Two Codes HELP
 
Thank you sir.

robpp 05-31-2011 09:51 PM

Re: Two Codes HELP
 
have you touched the throttle body?

swing4terps 06-01-2011 07:13 AM

Re: Two Codes HELP
 
No. I was messing around with my lights/the battery and didn't disconnect the negative. Hoping that had something to do with it. My 3rd startup will be this afternoon after I leave work, so hopefully they'll be gone.


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