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Electronic Control System Gas Plus Engines – FAULT CODE 111

Internal ECM Failure

Overview

Internal ECM Failure

CODE REASON EFFECT
Fault Code: 111
PID: S254
SPN: 629
FMI: 12
LAMP: Red
SRT: 

Engine control module critical internal failure – bad intelligent device or component. Error internal to the ECM related memory hardware failures or internal ECM voltage supply circuits.

Engine possibly will not start or run.

Internal ECM Failure
SMALL | MEDIUM | LARGE

Circuit Description

The ECM is a computer that is responsible for engine control, diagnostics, and user features.

Component Location

The ECM is located on the side of the engine, next to the ignition control module (ICM).

Shop Talk

This fault code can only be caused by an internal ECM problem. Repairs to the ECM are not possible.

Cautions and Warnings

 CAUTION 

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

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the ECM.  
  STEP 1A. Check for fault codes. No active fault codes?
  STEP 1B. Check the power supply. Constant +12 VDC power supply to the ECM?
  STEP 1C. Calibrate the ECM. ECM calibrated successfully?
STEP 2. Clear the fault codes.  
  STEP 2A. Disable the fault code. Fault Code 111 inactive?
  STEP 2B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the ECM.

Guided Step 1A – Check for fault codes.

Conditions

  • Connect all components.

Action

  • Turn the keyswitch OFF and wait five seconds. Start the engine and let idle for one minute.

Fault Code 111 active?
YES NO
No Repair No Repair

 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 1B – Check the power supply.

Conditions

  • Turn keyswitch ON.

Action

  • Inspect the power supply to the ECM.
  • Check the OEM connector as a possible source of an intermittent power supply.

Is there a constant +12 VDC power supply to the ECM?
YES NO
No Repair

Intermittent power supply to the 31 pin OEM connector.

Refer to the OEM service manual.

 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 – Calibrate the ECM.

Conditions

  • Turn keyswitch ON
  • Connect all components.

Action

Did the ECM calibrate correctly?
YES NO
No Repair

Call for authorization prior to replacing the ECM.

Replace the ECM. Refer to Procedure 019-031.

Repair complete

Guided Step 2 – Clear the fault codes.

Guided Step 2A – 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 111 is inactive.

Is Fault Code 111 inactive?
YES NO
No Repair

Call for authorization prior to replacing the ECM.

Replace the ECM. Refer to Procedure 019-031.

Repair complete

Guided Step 2B – Clear the inactive fault codes.

Conditions

  • Connect all components
  • Connect INSITE™ electronic service tool
  • Turn keyswitch ON.

Action

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

All fault codes cleared?
YES NO
No Repair No Repair
Repair complete
Appropriate troubleshooting charts
Last Modified:  13-Jul-2004
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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.