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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 P0640 >> Testing >> Circuit/System Testing

Circuit/System Testing

NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector at the E24 intake air heater.
  2. Ignition ON, test for less than 2 V between the Intake Air Heater Switch On/Off Signal circuit terminal 2 and ground.
    • If greater than the specified value, test the Intake Air Heater Switch On/Off Signal circuit for a short to voltage. If the circuit tests normal, replace the K34 glow plug control module.
    • If less than the specified value, replace the E24 intake air heater.
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