Thread: P1685
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Old 04 Apr 2009, 03:35 pm
CREWZIN CREWZIN is offline
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Join Date: Sep 2001
Posts: 27,758
Default Re: P1685

Welcome to the forum. From PT D0-It-Yourself.net:

P1685 Skim Invalid Key - The engine controller has received an invalid key from the SKIM.

I would not mess with the SKIM. The issue with the SKIM may be tied to the faulty TCM. The TCM is integrated into one module, called the PCM.

SKIM Operation

When the ignition switch is moved to the RUN position, the SKIM transmits an RF signal to the transponder in the ignition key. The SKIM then waits for a response RF signal from the transponder in the key. If the response received identifies the key as valid, the SKIM sends a “valid key” message to the PCM over the PCI bus. If the response received identifies the key as invalid or no response is received from the transponder in the ignition key, the SKIM sends an “invalid key” message to the PCM. The PCM will enable or disable engine operation based upon the status of the SKIM messages. It is important to note that the default condition in the PCM is “invalid key.” Therefore, if no response is received by the PCM, the engine will be immobilized after two (2) seconds of running.

I do not think it's the transponder key. When the faulty TCM/PCM is replaced it may very well resolve the issue with the SKIM. If the issue still exists after the installation the dealer will troubleshoot it with a DRB III scan tool.
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