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Home >> Hummer >> 2010 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0335 To DTC P1381 >> DTC P0685 or P0690 >> Circuit/System Verification

Circuit/System Verification

NOTE: If you were sent here from Engine Cranks But Does Not Run, proceed to Circuit/System Testing.
  1. Engine running, command the engine controls ignition relay ON and OFF with a scan tool while observing the following engine controls Ignition Relay Control Circuit Status parameters:
    • Engine Controls Ignition Relay Control Circuit Low Voltage Test Status
    • Engine Controls Ignition Relay Control Circuit Open Test Status
    • Engine Controls Ignition Relay Control Circuit High Voltage Test Status

      Each parameter should toggle between OK and Not Run or Not Run and OK.

  2. Ignition ON, view the DTC information with a scan tool. DTC P0685 or P0690 should not set.
  3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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