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FAULT CODE 135

Oil Pressure Sensor Circuit

Printable Version  Printable Version

Overview

CODE REASON EFFECT
Fault Code: 135
PID: P100
SPN: 100
FMI: 3
LAMP: Yellow
SRT: 00-087		 High voltage detected at oil pressure sensor signal pin 7 of the sensor harness connector. No engine protection for high oil pressure.

Oil Pressure Sensor Circuit

Circuit Description

The oil pressure sensor is used by the electronic control module (ECM)
to monitor the lubricating oil pressure. The ECM monitors the voltage on the signal pin and converts this to a pressure value.

Component Location

  • M11 – The oil pressure sensor is located on the engine block to the right of the ECM.
  • 1994 N14 – The oil pressure sensor is located on the engine block near the pan rail on the fuel pump side of the engine.
  • 1991 N14 – The oil pressure sensor is located on the engine block above the fuel supply pump.

Shop Talk

Does the fault occur only in cold weather? If so, allow the oil to warm up and see if the fault goes inactive.

Cautions and Warnings

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3824775 – breakout cable
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3822917- female Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3824775 – breakout cable.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the oil pressure sensor.
STEP 1A. Inspect the oil pressure sensor and the sensor harness connector pins. No damaged pins
STEP 1B. Read the fault codes. Fault Code 135 active
STEP 1C. Check the oil pressure sensor supply voltage. 4.75 to 5.25 VDC
STEP 1C-1. Check the oil pressure sensor supply voltage.
STEP 1C-2. Measure the voltage out of the ECM.
STEP 1D. Check the oil pressure sensor signal voltage. 0.40 to 0.60 VDC
STEP 1D-1. Check for a short circuit from pin to pin.
STEP 1D-2. Check for continuity in the sensor harness.
STEP 1D-3. Check ECM response.
STEP 1D-4. Check ECM pin resistance.
STEP 2. Check the sensor harness.
STEP 2A. Inspect the sensor harness. No damaged pins
STEP 2B. Read the fault codes. Fault Code 135 active
STEP 2C. Check for a short circuit from pin to pin. More than 100k ohms
STEP 2D. Check for continuity in the sensor circuit. Less than 10 ohms
STEP 3. Check for an ECM response.
STEP 3A. Check for the appropriate ECM response. Fault Code 135 inactive, Fault Code 141 active
STEP 3B. Check ECM signal pin resistance. Less than 100k ohms
STEP 4. Clear the fault codes.
STEP 4A. Disable the fault code. Fault Code 135 inactive
STEP 4B. Clear the inactive fault codes. All fault codes cleared

Guided Step 1 – Check the oil pressure sensor.

Guided Step 1A – Inspect the oil pressure sensor and the sensor harness connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness from the oil pressure sensor.
  • Flush and clean the connector pins using electronic contact cleaner, Part Number 3824510.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the sensor harness. Refer to Procedure 019-201 or 019-202.
  • Replace the sensor harness. Refer to Procedure 019-043.
  • Replace the oil pressure sensor. Refer to Procedure 019-066.
  • Install the appropriate connector seal if it is damaged or missing.
    Refer to Procedure 019-201 or 019-202.

Guided Step 1B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for one minute.
  • Read the fault codes using INSITE™ electronic service tool.
OK NOT OK
Fault Code 135 active Repair complete.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3824775 – breakout cable.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3824775 – breakout cable.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
Guided Step 1C – Check the oil pressure sensor supply voltage.

Conditions

  • Disconnect all pressure and temperature sensors and the coolant level sensor or shorting plug from the sensor harness.
  • Turn keyswitch ON.

Action

  • Install oil pressure sensor breakout cable, Part Number 3824775, between the sensor and the sensor harness connector.
  • Measure the supply voltage from pin A to pin B of the breakout cable.
OK NOT OK
4.75 to 5.25 VDC Does not meet specifications.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3824775 – breakout cable.
Guided Step 1C-1 – Check the oil pressure sensor supply voltage.

Conditions

  • Disconnect all pressure and temperature sensors and the coolant level sensor from the sensor harness.
  • Connect sensor harness connector to the ECM.

Action

  • Install breakout cable, Part Number 3824775, to the oil pressure sensor harness connector.
  • Measure the supply voltage from pin A to pin B of the breakout cable.
  • Note: Do not connect the sensor to the breakout cable.
OK NOT OK
4.75 to 5.25 VDC

  • Replace the oil pressure sensor. Refer to Procedure 019-066.
 Does not meet specifications.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
Guided Step 1C-2 – Measure the voltage out of the ECM.

Conditions

  • Disconnect the sensor harness connector from the ECM.
  • Turn keyswitch ON.

Action

  • Using test lead, measure the voltage from pin 22 to pin 13 at the sensor port of the ECM.
OK NOT OK
4.75 to 5.25 VDC

  • Replace the sensor harness. Refer to Procedure 019-043.
 Replace the ECM. Refer to Procedure 019-031.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3824775 – breakout cable.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.
Guided Step 1D – Check the oil pressure sensor signal voltage.

Conditions

  • Disconnect all pressure and temperature sensors and the coolant level sensor or shorting plug from their connectors on the harness.
  • Connect the sensor harness connector to the ECM.
  • Turn keyswitch ON.

Action

  • Install oil pressure sensor breakout cable, Part Number 3824775, between the sensor and the sensor harness connector.
  • Measure the signal voltage from pin C to pin B of the breakout cable.
OK NOT OK
0.40 to 0.60 VDC Does not meet specifications.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 1D-1 – Check for a short from pin to pin.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Disconnect all pressure sensors and the coolant level sensor or shorting plug from their connectors.

Action

  • Measure the resistance from pin 22 to all other pins in the ECM sensor connector.
  • Measure the resistance from pin 7 to all other pins in the ECM sensor connector.
  • Measure the resistance from pin 13 to all other pins in the ECM sensor connector.
OK NOT OK
More than 100k ohms Repair or replace the sensor harness.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 1D-2 – Check for continuity in the sensor harness.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the oil pressure sensor from the sensor harness.
  • Disconnect the sensor harness connector from the ECM.

Action

  • Measure the resistance from pin 22 of the sensor harness connector to pin A of the sensor connector.
  • Measure the resistance from pin 7 of the sensor harness connector to pin C of the sensor connector.
  • Measure the resistance from pin 13 of the sensor harness connector to pin B of the sensor connector.
OK NOT OK
Less than 10 ohms Correct pin-to-pin wiring or an open circuit.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.
Guided Step 1D-3 – Check ECM response.

Conditions

  • Disconnect sensor harness connector from the ECM.
  • Turn keyswitch ON.

Action

  • Install Part Number 3822917, as a jumper wire, between ECM sensor harness port pin 7 and pin 13.
  • Read the fault codes.
OK NOT OK
Fault Code 135 inactive, Fault Code 141 active Fault Code 135 active

  • Replace the ECM. Refer to Procedure 019-031.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.
Guided Step 1D-4 – Check ECM pin resistance.

Conditions

  • Turn keyswitch OFF.
  • Disconnect sensor harness connector from the ECM.

Action

  • Measure the resistance from pin 7 to pin 13 in the ECM port; use test lead, Part Number 3822917.
OK NOT OK
Less than 100k ohms

  • Replace the sensor. Refer to Procedure 019-063.
 Greater than 100k ohms

  • Replace the ECM. Refer to Procedure 019-031.

Guided Step 2 – Check the sensor harness.

 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
Guided Step 2A – Inspect the sensor harness.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Flush and clean the connector pins using electronic contact cleaner, Part Number 3824510.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the sensor harness. Refer to Procedure 019-203.
  • Replace the sensor harness. Refer to Procedure 019-043.
  • Replace the ECM. Refer to Procedure 019-031.
  • Replace the o-ring on the 28-pin connector if it is damaged or missing. Refer to Procedure 019-203.

Guided Step 2B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for one minute.
  • Read the fault codes using INSITE™ electronic service tool.
OK NOT OK
Fault Code 135 active Repair complete.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2C – Check for a short circuit from pin to pin.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.
  • Disconnect all pressure sensors and the coolant level sensor or shorting plug from their connectors on the harness.

Action

  • Measure the resistance from pin 22 of the sensor harness connector to all other pins in the connector.
  • Measure the resistance from pin 7 of the sensor harness connector to all other pins in the connector.
  • Measure the resistance from pin 13 of the sensor harness connector to all other pins in the connector.
OK NOT OK
More than 100k ohms Replace the sensor harness. Refer to Procedure 019-043.

Guided Step 2D – Check for continuity in the sensor circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the oil pressure sensor from the sensor harness.
  • Disconnect the sensor harness connector from the ECM.

Action

  • Inspect wiring from ECM to oil pressure sensor; refer to wiring diagram.
  • Measure the resistance from pin A to pin 22.
  • Measure the resistance from pin C to pin 7.
  • Measure the resistance from pin B to pin 13.
OK NOT OK
Less than 10 ohms Correct pin-to-pin wiring, or repair or replace sensor harness.

Guided Step 3 – Check for an ECM response.

 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
Guided Step 3A – Check for the appropriate ECM response.

Conditions

  • Disconnect the sensor harness connector from the ECM.
  • Turn keyswitch ON.

Action

  • Install Part Number 3822917, as a jumper wire, between ECM sensor harness port pin 7 and pin 13.
  • Read the fault codes using INSITE™ electronic service tool.
OK NOT OK
Fault Code 135 inactive, Fault Code 141 active Replace the ECM. Refer to Procedure 019-031.

 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822917 – female Deutsch/AMP/Metri-Pack test lead.
Guided Step 3B – Check ECM signal pin resistance.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the sensor harness connector from the ECM.

Action

  • Measure the resistance from pin 7 of the ECM sensor port to pin 13 of the ECM sensor port; use test lead, Part Number 3822917.
OK NOT OK
Less than 100k ohms Replace the ECM. Refer to Procedure 019-031.

Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

  • Connect all the components.

Action

  • Start the engine and let it idle for one minute.
  • Verify Fault Code 135 is inactive.
OK NOT OK
Fault Code 135 inactive Return to the troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all the steps have been completed and checked again.

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • Connect all the components.

Action

  • Erase the inactive fault codes using INSITE™ electronic service tool.
OK NOT OK
All fault codes cleared Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting charts
Last Modified:  08-Sep-2004
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