LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2011 >> Chevy Express G2500, Van Cargo Extended, 6.6 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.3L - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0128 >> Circuit/System Verification

Circuit/System Verification

  1. If the ignition has been OFF for 8 hours or more, the ECT and the IAT, should be within 6°C (11°F) of each other and also the ambient temperature. Turn ON the ignition, with the engine OFF, and use a scan tool to observe the IAT and the ECT sensor parameters.
  2. Use the scan tool to verify the proper operation of the engine cooling system fans.
    3. WARNING:

    Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine, fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at any time. Flammable antifreeze could cause a serious fire.

  3. Turn OFF the ignition.
  4. Inspect the cooling system surge tank for the proper engine coolant level. Refer to Cooling System Leak Testing , and Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac N Fill) , Cooling System Draining and Filling (Static Fill Diesel) .
    5. NOTE:

    A critical analysis of the operation of the thermostat is necessary to properly diagnose these DTCs.

  5. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis .
  6. Operate the vehicle with the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
scientia non olet · About LEMON Manuals