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Electronic Control Module Critical Internal Failure – Bad Intelligent Device or Component
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Overview
Electronic Control Module Critical Internal Failure – Bad Intelligent Device or Component
| CODE | REASON | EFFECT |
| Fault Code: 111 PID: S254 SPN: 629 FMI: 12/12 LAMP: Red SRT: |
Electronic Control Module Critical Internal Failure – Bad Intelligent Device or Component. Error internal to the electronic control module (ECM) related to memory hardware failures or internal ECM voltage supply circuits. |
Engine may not start. |
 ISB, ISC, and ISL Electronic Control Module
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Circuit Description
The ECM has internal diagnostics that continuously run and check the internal memory.
Component Location
The ECM is located on the fuel system side of the engine. Refer to Procedure 100-002 for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
This fault code is triggered when the internal ECM diagnostics detect a read or write error internal to the module.
Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
The ECM will turn off the red STOP 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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
This fault code can only be caused by an internal ECM problem. Repairs are not possible for the ECM.
Refer to Troubleshooting Fault Code t05-111
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