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  #1  
Old 05-31-2011, 09:37 PM
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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.
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Old 05-31-2011, 09:44 PM
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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
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Old 05-31-2011, 09:46 PM
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Re: Two Codes HELP

IAC = Idle Air Control
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Old 05-31-2011, 09:49 PM
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Re: Two Codes HELP

Thank you sir.
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Old 05-31-2011, 09:51 PM
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Re: Two Codes HELP

have you touched the throttle body?
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Old 06-01-2011, 07:13 AM
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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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