FAULT CODE 141

Oil Pressure Sensor Circuit

Overview

CODE REASON EFFECT
Fault Code: 141
PID: P100
SPN: 100
FMI: 4
LAMP: Yellow
SRT: 00-087

Low voltage detected at oil pressure sensor signal pin 7 of the sensor harness connector.

No engine protection for oil pressure.

Oil Pressure Sensor Circuit

SMALL | MEDIUM | LARGE

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

If Fault Code 143 or 415 is not present, the problem is not base engine related.

Cautions and Warnings


 CAUTION 

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

 CAUTION 

To reduce the possibility of damaging the 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 this test lead when taking a measurement:
Part Number 3824775 – breakout cable.

 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 3822917 – female Deutsch/AMP/Metri-Pack test lead.

 CAUTION 

To reduce the possibility of pin and harness damage, use this 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.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check for multiple fault codes.  
  STEP 1A. Read the fault codes. Fault Codes 123, 145, 154, 213, 222, 352, and 422 are not active
STEP 2. Check the oil pressure sensor.  
  STEP 2A. Inspect the oil pressure sensor and the sensor harness connector pins. No damaged pins
  STEP 2B. Read the fault codes. Fault Code 141 active
  STEP 2C. Check the oil pressure sensor supply voltage. 4.75 to 5.25 VDC
  STEP 2C-1. Check the oil pressure sensor supply voltage.
  STEP 2C-2. Measure the voltage out of the ECM.
  STEP 2D. Check the oil pressure sensor signal voltage. 0.40 to 0.60 VDC
  STEP 2D-1. Check for a short circuit from pin to pin.
  STEP 2D-2. Check for continuity in the sensor harness.
  STEP 2D-3. Check ECM response.
  STEP 2D-4. Check ECM signal pin to return pin resistance.
STEP 3. Check the sensor harness.  
  STEP 3A. Inspect the sensor harness and the ECM connector for damaged pins. No damaged pins
  STEP 3B. Read the fault codes. Fault Code 141 active
  STEP 3C. Check for a short circuit to ground. More than 100k ohms
  STEP 3D. Check for a short circuit from pin to pin. More than 100k ohms
  STEP 3E. Check for correct pin-to-pin wiring between sensor and ECM and for continuity between sensor and ECM. Less than 10 ohms
  STEP 3F. Clear and check the fault codes. No reoccurrence of Fault Code 141
STEP 4. Check for an ECM response.  
  STEP 4A. Check for the appropriate ECM response. Fault Code 141 inactive, Fault Code 135 active
  STEP 4B. Check ECM signal pin resistance. Replace the ECM
STEP 5. Clear the fault codes.  
  STEP 5A. Disable the fault code. Fault Code 141 inactive
  STEP 5B. Clear the inactive fault codes. All fault codes cleared


Guided Step 1 – Check for multiple fault codes.

Guided Step 1A – Read the fault codes.

Conditions

  • Turn keyswitch ON.

Action

  • Read the fault codes using INSITE™.
OK NOT OK

Fault Codes 123, 145, 154, 213, 222, 352, and 422 are not active

Possible sensor failure, a short circuit to ground in the sensor positive (+) 5 VDC common supply, or a short circuit from pin to pin.

Fault Code Multiple A


Guided Step 2 – Check the oil pressure sensor.

Guided Step 2A – 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 019-065.
  • Install the appropriate connector seal if it is damaged or missing. Refer to Procedure 019-201 or 019-202.

Guided Step 2B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for 1 minute.
  • Read the fault codes using INSITE™.
OK NOT OK

Fault Code 141 active

Repair complete.

 CAUTION 

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

 CAUTION 

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

 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 3822917 – female Deutsch/AMP/Metri-Pack test lead.

Guided Step 2C – Check the oil pressure sensor supply voltage.

Conditions

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

Action

  • Install the 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.
SMALL | MEDIUM | LARGE
OK NOT OK

4.75 to 5.25 VDC

Does not meet specifications.

 CAUTION 

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

Guided Step 2C-1 – Check the oil pressure sensor supply voltage.

Conditions

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

Action

  • Install the oil pressure sensor breakout cable, Part Number 3824775, between the sensor and the sensor harness connector.

Note: Do not connect the sensor to the breakout cable.

  • Measure the supply voltage from pin A to pin B of the breakout cable.
SMALL | MEDIUM | LARGE
OK NOT OK

4.75 to 5.25 VDC

  • Replace the oil pressure sensor. Refer to Procedure 019-065.

Does not meet specifications.

 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 3822917 – female Deutsch/AMP/Metri-Pack test lead.

Guided Step 2C-2 – Measure the voltage out of the ECM.

Conditions

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

Action

  • Measure the voltage between pin 22 and pin 13 of the ECM sensor port.
SMALL | MEDIUM | LARGE
OK NOT OK

4.75 to 5.25 VDC

  • Repair the sensor harness. Refer to Procedures 019-203.
  • 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 this test lead when taking a measurement:
Part Number 3824775 – breakout cable.

 CAUTION 

To reduce the possibility of pin and harness damage, use this 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 this 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 2D – Check the oil pressure sensor signal voltage.

Conditions

  • Connect sensor harness connector to ECM.
  • Disconnect all pressure sensors except the oil pressure sensor from the sensor harness.
  • Disconnect the coolant level sensor or shorting plug from the sensor harness.
  • Turn keyswitch ON.

Action

  • Install the 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.
SMALL | MEDIUM | LARGE
OK NOT OK

0.40 to 0.60 VDC

Does not meet specifications.

 CAUTION 

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

Guided Step 2D-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 this test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

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

Conditions

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

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 open circuit.

  • Repair harness. Refer to Procedure 019-203.
  • Replace harness. Refer to Procedure 019-043.

 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 2D-3 – Check ECM response.

Conditions

  • Disconnect sensor harness connector from the ECM.
  • Install Part Number 3822917, as a jumper wire, between ECM sensor harness port pin 22 and pin 7.
  • Turn keyswitch ON.

Action

  • Read the fault codes using INSITE™.
SMALL | MEDIUM | LARGE
OK NOT OK

Fault Code 141 inactive, Fault Code 135 active

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 2D-4 – Check ECM signal pin to return 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 sensor port; use test lead, Part Number 3822917.
OK NOT OK

Less than 100k ohms

  • Replace the sensor. Refer to Procedure 019-065.

More than 100k ohms

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


Guided Step 3 – Check the sensor harness.

 CAUTION 

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

Guided Step 3A – Inspect the sensor harness and the ECM connector for damaged pins.

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 3B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for 1 minute.
  • Read the fault codes using INSITE™.
OK NOT OK

Fault Code 141 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 3C – Check for a short circuit to ground.

Conditions

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

Action

  • Measure the resistance from pin 7 of the sensor harness connector to engine block ground.
  • Measure the resistance from pin 22 of the sensor harness connector to engine block ground.
SMALL | MEDIUM | LARGE
OK NOT OK

More than 100k ohms

Repair or replace the sensor harness.

  • Repair the sensor harness. Refer to Procedure 019-203.
  • Replace the sensor harness. Refer to Procedure 019-043.

 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 3D – Check for a short circuit from pin to pin.

Conditions

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

Action

  • 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.
  • Measure the resistance from pin 22 of the sensor harness connector to all other pins in the connector.
SMALL | MEDIUM | LARGE
OK NOT OK

More than 100k ohms

Repair or replace the sensor harness.

  • Repair the sensor harness. Refer to Procedure 019-203.
  • Replace the sensor harness. Refer to Procedure 019-043.

 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 3E – Check for correct pin-to-pin wiring between sensor and ECM and for continuity between sensor and ECM.

Conditions

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

Action

  • Measure the resistance from pin 22 of the sensor harness connector at the ECM to pin A of the sensor harness.
  • Measure the resistance from pin 7 of the sensor harness connector at the ECM to pin C of the sensor harness.
  • Measure the resistance from pin 13 of the sensor harness connector at the ECM to pin B of the sensor harness.
OK NOT OK

Less than 10 ohms

Repair or replace sensor harness.

Guided Step 3F – Clear and check the fault codes.

Conditions

  • Connect all the components.

Action

  • Start the engine and let it idle for 1 minute.
  • Snap the accelerator pedal.
  • Read the fault codes with the service tool.
OK NOT OK

Fault Code 141 inactive

Fault Code 141 active


Guided Step 4 – Check for an ECM response.

 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 damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.

Guided Step 4A – 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 22 and pin 7.
  • Read the fault codes using INSITE™.
SMALL | MEDIUM | LARGE
OK NOT OK

Fault Code 141 inactive, 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 4B – Check ECM signal pin resistance.

Conditions

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

Action

  • Measure the resistance from pin 7 to pin 13 in 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 5 – Clear the fault codes.

Guided Step 5A – Disable the fault code.

Conditions

  • Connect all the components.

Action

  • Start the engine and let it idle for 1 minute.
  • Verify Fault Code 141 is inactive.
OK NOT OK

Fault Code 141 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 5B – Clear the inactive fault codes.

Conditions

  • Connect all the components.

Action

  • Erase the inactive fault codes using INSITE™.
OK NOT OK

All fault codes cleared

Troubleshoot any remaining active fault codes.

Repair complete

Appropriate troubleshooting charts

Last Modified:  16-Oct-2003