2003 Dodge Dakota Club Cab Logo
Anonymous
Anonymous Posted on Jun 24, 2011
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I have a 2003 dodge dakota. 4.7l. I get codes p0685 and p0688. No start no spark. Relay is good. But voltage drops when using a voltage meter on one of the grounds in the pdc. Any live wire and that ground has power drop. Is that normal? Or is. there a short in that ground? If it is any place I should start looking?

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  • Posted on Jun 24, 2011
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P0685 DODGE - Auto Shutdown Relay Control Circuit Failure
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)

Possible causes - ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech notes Check all the ECM fuses, if the fuses are OK try replacing the ASD relay. P0685 DODGE Description Short or open in Auto Shutdown (ASD) relay circuit

P0688 DODGE - Auto Shutdown Relay Control Circuit Low
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)

Possible causes - ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech notes Check all the ECM fuses, if the fuses are OK try replacing the ASD relay. P0688 DODGE Description The Front Control Module (FCM) has detected the supply voltage below an acceptable value

  • 4 more comments 
  • Anonymous Jun 24, 2011

    This means the relay may look good, but is shorting or stuck in the open position, thus needs to be replaced.

  • Anonymous Jun 24, 2011

    Its not the relay. Replaced that and it didn't work. That leaves a short. Could it be in the pdc itself. Seems to keep voltage in the wiring harness.

  • Anonymous Jun 24, 2011

    It could be. I would start by grounding the control wire from the ASD relay at the Powertrain Control Module connector. Also try test the ASD relay operation with the ATM tests found in a compatible scan tool. If you can get access to a scanner, you can run an ATM test to see if everything is working. In addition, you can look for other PCM data that causes it not to ground the ASD relay. Check the cam/crank sensor signal and missing or erratic patterns.

  • Anonymous Jun 24, 2011

    Turn the ignition off.Disconnect the PCM harness connector.Disconnect the IPM C4 harness connector. Measure the resistance of the ASD Output circuit between the IPM harnessconnector and the PCM harness connector.Is the resistance below 5.0 ohms?

  • Anonymous Jun 24, 2011

    NOTE: Inspect the ASD Relay fuse located in the IPM. If the ASD Relay fuse is open, repair the cause of the open first before continuing. Inspect the ASD Relay Output circuit for a short to ground for the cause of the open fuse.NOTE: Diagnose P685 - Auto Shutdown Relay Control Circuit first if set along with this DTC.

    With the DRBIII, erase the DTC.Attempt to start the engine. If the engine will not start, crank the engine for at least15 seconds. It may be necessary to repeat several times.Does the DTC reset?

  • Anonymous Jun 25, 2011

    Jumped the relay ground. Started right up. But heard a buzzing coming from the idle air control. Could it be bad and the pcm is kicking in the auto shutdown? Or should I still look for a short?

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