Trouble Code: 135
PID: P100
SPN: 100
FMI: 3/3
LAMP: Orange
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Reason:
A high signal voltage has been detected in the engine oil pressure circuit.
Impact:
No impact on performance.
Circuit Description:
The Engine Control Module (ECM) supplies a 5-volt power to the engine oil pressure sensor through the sensor supply circuit. The ECM also provides a ground to the sensor via the sensor return circuit. The engine oil pressure sensor sends a signal to the ECM through the engine oil pressure sensor signal circuit. This sensor signal voltage varies based on the pressure in the oil line. The ECM detects a low signal voltage when the oil pressure is slightly low during operation and a high signal voltage when the engine speed is high or the oil temperature is low.
Component Location:
The engine oil pressure sensor is located at the outlet of the oil filter head.
Conditions to Run the Diagnostic:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions to Set the DTC:
The ECM has detected that the engine oil pressure signal voltage is too high.
Action if DTC is Active:
- The ECM immediately illuminates the amber CHECK ENGINE light when the diagnostic runs and fails.
- The engine oil pressure indication defaults to preset values.
Conditions to Clear DTC:
- To verify the repair, perform a key cycle, start the engine, and let it idle for one minute.
- The DTC status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
- The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
- The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
The oil pressure sensor shares supply and return cables in the engine wiring harness with other sensors. Opens and shorts in the engine wiring harness can cause multiple trouble codes to be active. Check for multiple errors before troubleshooting error code 135.
Possible causes for this error code are:
- Open return circuit in the harness, connectors, or sensor.
- Signal circuit shorted to sensor power or battery voltage.