Posted on by

Electronic Control System Gas Plus Engines – FAULT CODE 142 – L Gas Plus

High Engine Oil Pressure – Over Pressure

Overview

High Engine Oil Pressure – Over Pressure

CODE REASON EFFECT
Fault Code: 142
PID: P100
SPN: 100
FMI: 16
LAMP: Amber
SRT: 

Engine Oil Pressure High — Warning. Pressure is above the engine protection limit.

None on performance.

Engine 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. The oil pressure value is used by the ECM for the engine protection system.

Component Location

The oil pressure sensor is located in the engine block, on the fuel system side.

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.

The L Gas Plus uses only a pressure sensor.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the fault codes.  
  STEP 1. Read the fault codes. Fault Code 142 active?
STEP 2. Check the oil pressure sensor accuracy.  
  STEP 2A. Check the sensor accuracy. Sensor reading is correct?
STEP 3. Clear the fault codes.  
  STEP 3A. Disable the fault code. Fault Code 142 inactive?
  STEP 3B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the fault codes.

Guided Step 1A – Read the fault codes.

Conditions

  • Turn keyswitch ON
  • Connect the INSITE™ electronic service tool.

Action

Use INSITE™ electronic service tool to read the fault codes.

Fault Code 142 active?
YES NO
No Repair No Repair

Guided Step 2 – Check the oil pressure sensor accuracy.

Guided Step 2A – Check the sensor accuracy.

Conditions

  • Connect a mechanical oil pressure gauge to the engine
  • Connect INSITE™ electronic service tool to the vehicle datalink.

Action

  • Start the engine and compare the oil pressure reading on the service tool monitor screen to the reading on the mechanical oil pressure gauge. The pressure sensor displays in absolute, add atmospheric pressure to gauge reading.

Note: If necessary, increase the engine rpm’s to make it easier to see differences in the readings.

Sensor reading is correct?
YES NO
No Repair

Replace the sensor if electronic service tool reading differs from mechanical gauge reading. Refer to Procedure 019-155.

Guided Step 3 – Clear the fault codes.

Guided Step 3A – Disable the fault code.

Conditions

  • Connect all components
  • Turn keyswitch ON.

Action

  • Start the engine and let it idle for one minute.
  • Verify that Fault Code 142 is inactive.

Note: If the fault was at a particular speed, run the engine at that speed to verify the problem is corrected.

Fault Code 142 inactive?
YES NO
No Repair

Repeat the troubleshooting steps. If the fault code remains active, refer to the Lubricating Oil Temperature Above Specifications troubleshooting symptom chart in Section TS of the Troubleshooting and Repair Manual C Gas, C Gas Plus, and L Gas Plus Engines, Bulletin 3666206.

Guided Step 3B – Clear the inactive fault codes.

Conditions

  • Connect all components
  • Turn keyswitch ON.

Action

  • Use INSITE™ electronic service tool to erase the inactive fault codes .

All fault codes cleared?
YES NO
No Repair

Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting charts
Last Modified:  28-Sep-2004
Avatar photo

Published by Jack

Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.