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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 >> Component Testing

Component Testing

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  1. Remove the fuel filter from the DFCM housing.
  2. Remove the DFCM housing from the vehicle.
  3. Connect a DMM between the ignition 1 voltage circuit and the ground circuit of the fuel heater.
  4. Cool the thermostatic switch of the fuel heater with ice or refrigeration.
  5. Observe the DMM for continuity.
    • If the thermostatic switch does not turn and complete the circuit when the temperature is between -8.4°C to +15.4°C (+16.9°F to +59.8°F) replace the DFCM housing.
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