Cummins M11 Code 342 is the Cummins M11 CELECT (1990-94) diagnostic sheet for Fault Code 342, a red-lamp ECM calibration fault (PID S253, FMI 12). This 2-page PDF, published by TruckFaultCodes.com (Copyright 2017), gives the circuit description, component location and the full troubleshooting chart. It applies to both M11 and N14 CELECT engines that share this fault-code table.
Cummins M11 Code 342 document details
| Brand | Cummins |
| Model coverage | M11 and N14 CELECT (1990-94) |
| System / Group | ECM calibration |
| Fault code | 342 |
| PID / SPN / FMI | PID S253, FMI 12 |
| Warning lamp / SRT | RED lamp, SRT 00-606 |
| Pages | 2 |
| File size | 0.2 MB |
| Format / Language | PDF, English |
Document table of contents
- Circuit description
- Component location
- Shop talk
- Troubleshooting steps
Applicable truck models
This sheet covers Cummins M11 CELECT and N14 CELECT (1990-94) engines used in Class 8 highway tractors and vocational trucks of that era. The ECM is bolted to the left side of the engine. Confirm the engine dataplate and calibration against your service data on the Cummins official support site before ordering parts.
The electronic control module (ECM) is the computer responsible for engine control, diagnostics, and driver features, and it is bolted to the left side of the engine. The extract lists an internal ECM failure or an uncalibrated ECM as the possible causes, and it instructs the technician to replace the ECM when more than three inactive counts are stored. The troubleshooting steps confirm whether calibration has been downloaded into the ECM, cycle the key switch and idle the engine for one minute to see whether the code goes inactive, then count the inactive events before clearing codes with the diagnostic tool.
Who needs this Cummins M11 Code 342 manual
Heavy-duty technicians and workshop owners chasing a stored red-lamp Cummins fault code on an M11 CELECT engine use this ECM calibration sheet to follow the factory calibration and inactive-count checks instead of guessing. Keep it beside your INSITE or generic diagnostic tool when confirming the repair and clearing the inactive counts.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Cummins DTCs
- Cummins M11 CELECT (1990-94)
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