This Cummins Code 351 document is a troubleshooting procedure for Fault Code 351 on CM2150 engines, focused on injector power supply voltage. It explains the circuit description, fault conditions, diagnostic steps, connector checks, resistance checks, validation, and code clearing with INSITE™ electronic service tool.
Official Cummins Code 351 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB with CM2150; ISC and ISL with CM2150 are also referenced in the injector power supply section |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Year unknown; Last Modified: 20-Jul-2010 and 01-Dec-2010 |
| Pages | 9 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 351 – Injector Power Supply – Bad Intelligent Device or Component
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the ECM power supply.
- Guided Step 3 – Validate the occurrence of this fault code.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 DTC group. The extract also names ISC and ISL with CM2150 under the injector power supply description, but the file information identifies the main coverage as ISB6.7 CM2150. The procedure is for Fault Code 351, PID S251, SPN 627, FMI 12, where the ECM measured injector boost voltage is low and the amber CHECK ENGINE lamp is commanded. For official manufacturer information, visit Cummins official website.
Who needs this Cummins Code 351 manual
Workshop owners, diesel technicians, and fleet mechanics need this manual when diagnosing low injector power supply voltage, possible low power, engine misfire, or a no-start condition on covered CM2150 engines. It is useful when checking ECM battery supply, ECM ground circuits, injector-related active faults 322, 323, 324, 325, 331, and 332, and when deciding whether ECM replacement authorization is required.
The procedure directs the technician to inspect ECM power supply connectors and fuses for loose connectors, corroded pins, bent or broken pins, pushed back or expanded pins, moisture, damaged seals, debris, wire insulation damage, and damaged locking tabs. It then uses resistance measurements between ECM battery supply pins and battery positive connections, and between ECM ground pins and engine block ground. The document also instructs the technician to operate the engine at idle or high idle with no load, read fault codes through INSITE™ electronic service tool, verify whether Fault Code 351 reoccurs, disable the fault code, and clear inactive fault codes after repair.
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