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Home › Saturn › 2007 › Sky Red Line, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls & Fuel - 2.0L - DTC P0010 To P0304 › DTC P0125 or P0128 › Circuit/System Verification

Circuit/System Verification

    CAUTION: 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.
  1. Turn OFF the ignition.
  2. Inspect the cooling system surge tank for the proper engine coolant level. Refer to Cooling System Leak Testing and Draining and Filling Cooling System (GE-47716) or Draining and Filling Cooling System (2.4L LE5 Only) .
  3. If the ignition has been OFF for 8 hours or greater, the intake air temperature (IAT), the IAT 2 and the ECT should be within 9°C (16°F) of each other and also the ambient temperature. Ignition ON, observe the scan tool IAT Sensor, IAT 2 Sensor and the ECT Sensor parameters. Compare those sensor parameters to each other and also to the ambient temperature to determine if the ECT sensor is skewed colder.
  4. Engine running, observe the ECT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F) depending on the current ambient temperature and the vehicle operating conditions.
  5. Use the scan tool to verify the proper operation of the engine cooling system fans.
    6. IMPORTANT: A critical analysis of the operation of the thermostat is necessary to properly diagnose these DTCs.
  6. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis .
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