SPN 100 - FMI 3 (Fault Code 135)

SPN 100 - FMI 3 (Fault Code: 135)
ISC and ISL CM2150 - Engine Oil Rifle Pressure 1

Fault Code: 135
PID(P), SID(S): P100
SPN: 100
FMI: 3/3

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. No engine protection for oil pressure.

Circuit Description:
The ECM provides a 5 volt supply to the engine oil pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The engine oil pressure sensor provides a signal to the ECM on the engine oil pressure sensor signal circuit. This sensor signal voltage changes, based on the pressure in the oil rifle. The ECM will detect a low signal voltage at operating conditions when the oil pressure may be slightly lower. The ECM will detect a high signal voltage during high engine speeds or operating conditions when the oil temperature is low.

Component Location:
The engine oil pressure sensor is located on the left side of the engine block.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The ECM detects that the engine oil pressure signal voltage is greater than 4.75-VDC for more than 16 seconds.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value of the engine oil pressure reading is used.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk:

  • Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
  • The oil pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 135, check for multiple fault codes.

Possible causes of this fault code include:
• Open return circuit in the harness, connectors, or sensor
• Signal circuit shorted to sensor supply or battery voltage.

Read More:
SPN 974 - FMI 4 (Fault Code 134)
SPN 91 - FMI 4 (Fault Code 133)


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