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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L (LMM) - DTC P029D To DTC P1448 >> DTC P0640 >> Circuit/System Testing
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Circuit/System Testing

IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Disconnect the IA heater
  2. Turn ON the ignition. Test the IA heater command 1 circuit terminal 2 for less than 12 volts.
    • If greater than 12 volts, test the command 1 circuit for a short to voltage. If the circuit tests normal, replace the glow plug control module.
  3. If the command 1 circuit tests normal, replace the IA heater.
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