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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 Always On >> Circuit/System Testing

Circuit/System Testing

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  1. Inspect the water-in-fuel lamp for proper operation. Refer to Water-in-Fuel Lamp Always On .
  2. Disconnect the fuel heater harness connector from the fuel DFCM housing.
  3. Connect a DMM and test for continuity between the terminals of the fuel heater element.
  4. Observing the Fuel Temperature parameter with a scan tool.
    • If the fuel temperature is more than 15.5°C (60°F) and continuity is present, the thermostatic switch is stuck ON. Replace the DFCM.
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