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Reason:Engine Oil Rifle Pressure 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the engine oil pressure circuit. Effect:None on performance. Circuit Description:An engine oil pressure switch or oil pressure sensor is used by the engine control module (ECM) to monitor the lubricating oil pressure. For engines with an oil pressure switch, the switch is normally closed when the engine is not running and open when oil pressure is present. For engines with an oil pressure sensor, the ECM will detect a low signal voltage at operating conditions when the oil pressure...

Reason:Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at accelerator pedal position number 1 circuit. Effect:The engine will operate in Limp Home mode. Circuit Description:The accelerator position sensor is a Hall effect sensor attached to the accelerator pedal. The accelerator position sensor varies the signal voltage to the engine control module (ECM) as the accelerator pedal is depressed and released. Low signal voltage is received by the ECM when the accelerator pedal is at 0 percent. A high signal voltage is received by the ECM when the accelerator...

Reason:Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at accelerator pedal position number 1 signal circuit. Effect:The engine will operate in Limp Home mode Circuit Description:The accelerator position sensor is a Hall effect sensor attached to the accelerator pedal. The accelerator position sensor varies the signal voltage to the engine control module (ECM) as the accelerator pedal is depressed and released. Low signal voltage is received by the ECM when the accelerator pedal is at 0 percent. A high signal voltage is received by the ECM when the...

Reason:Engine Oil Rifle Pressure 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage or open circuit detected at the engine oil pressure circuit. Effect:None on performance. Circuit Description:An engine oil pressure switch or oil pressure sensor is used by the engine control module (ECM) to monitor the lubricating oil pressure. For engines with an oil pressure switch, the switch is normally closed when the engine is not running and open when oil pressure is present. For engines with an oil pressure sensor, the ECM will detect a low signal voltage at operating conditions when...

Reason:High Engine Temperature (HET) Shutdown Relay Driver Diagnostic Has Dectected An Error – Condition Exists Effect:The high engine temperature shutdown lamp will not turn on. Circuit Description:The high engine temperature shutdown lamp will indicate when the engine has reached a most severe level high coolant or intake manifold temperature. Fault Code 151 or 155 will trigger the high engine temperature shutdown lamp. Component Location:Refer to the OEM service manual for lamp location Conditions for Running the Diagnostics:This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault Codes:The...