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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System & Fuel System - 6.6L (LLY) - Troubleshooting & Diagnosis) >> Fuel Heater Inoperative >> Circuit/System Testing

Circuit/System Testing

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Check the Water in Fuel lamp for proper operation. Refer to Water-in-Fuel Lamp Always On .

  1. Disconnect the fuel heater harness connector from the fuel DFCM housing.
  2. Turn ON the ignition with the engine OFF.
  3. Probe the fuel heater ignition 1 voltage circuit with a test lamp connected to a good ground.
    • If the test lamp did not illuminate repair the open or short to ground on the ignition 1 voltage circuit.
  4. Probe the fuel heater ground circuit at the DFCM housing with a test lamp connected to battery voltage.
    • If the test lamp did not illuminate repair the open in the ground circuit.
  5. If all circuits test normal, test the fuel heater thermostatic switch for proper operation. Refer to Component Testing in this diagnostic.
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