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Home >> Chevrolet >> 2012 >> Cruze LS, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P00B7 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the DTC information with a scan tool. DTC P00B3 00, P00B4 00, P0117 00, P0118 00, P0480 00, P0481 00, P0597 00, P0598 00, or P0599 00 should not be set.
  2. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. Refer to Cooling System Draining and Filling (GE-47716 Fill) , Cooling System Draining and Filling (Static Fill) , and Loss of Coolant .
  3. Verify the engine cooling fan operates. Refer to Cooling Fan Inoperative .
    4. NOTE:

    Depending on ambient temperature, it may take up to 4 min for the temperature to decrease less than the specified value.

  4. Engine idling for 15 min with the A/C OFF.
  5. Command the Engine Coolant Thermostat Heater to 100% with a scan tool. Increase the engine speed to 3 000 RPM. Observe the scan tool ECT sensor parameters. The temperature should decrease to less than 85°C (185°F).
  6. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
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