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Home >> Chevrolet >> 2011 >> Chevy Express G2500, Van Cargo Extended, 6.6 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.6L (LGH) - DTC P0016 Through DTC P11DC >> Diagnostic Information and Procedures >> DTC P064C >> Testing >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector X2 at the K34 glow plug control module.
  2. Ignition ON, verify that a test lamp illuminates between the Run/Crank Ignition 1 Voltage circuit terminal 33 and ground.
    • If the test lamp does not illuminate repair the open or high resistance in the Run/Crank Ignition 1 Voltage circuit.
  3. Verify that a test lamp illuminates between the Run/Crank Ignition 1 Voltage circuit terminal 33 and the Signal Ground circuit terminal 10
    • If the test lamp does not illuminate repair the open or high resistance in the Signal Ground circuit.
    • If the test lamp illuminates, replace the K34 glow plug control module.
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