Cummins fault code 476 is a yellow-lamp diagnostic trouble code for the Cummins ISM CM570 (1999-02) engine platform, documented in this 4-page troubleshooting PDF covering the electronic air compressor governor. The manual gives the circuit description, component notes and the full step-by-step test sequence a technician follows to diagnose and clear the fault.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570, ISX CM570 and Signature CM570 (1999-02) |
| System / Group | ISM CM570 (1999-02) / DTCs |
| Fault code / DTC | 476 |
| Identifiers | PID S089 · SPN 1351 · FMI 3/3 |
| Warning lamp | YELLOW |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
| Source | TruckFaultCodes.com fault code library, Copyright 2017 |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Fault Code Verification and Reset
Cummins fault code 476 circuit description
The electronic air compressor governor is a device used by the electronic control module (ECM) to control the output of the air compressor. High voltage can be caused by a short circuit to battery or a short circuit to another wire in the harness. Voltage is required at the electronic air compressor governor to turn the compressor off. No voltage turns the compressor on. The ISM CM570 diagnostics in this file are indexed as PID S089, SPN 1351 and FMI 3/3, so it slots directly into the wider set of ISM CM570 fault codes on the platform.
Applicable truck models and engines
The procedure applies to Cummins ISM, ISX and Signature engines built on the CM570 (1999-02) electronic control module, fitted to a wide range of Class 7 and Class 8 on-highway trucks. Because component locations vary by chassis, the document repeatedly directs the technician to the OEM troubleshooting and repair manual for exact positions. Verify engine and calibration data against the official Cummins engine support resources before ordering parts.
Who needs this Cummins fault code 476 manual
Heavy-duty truck technicians, fleet maintenance teams and independent workshop owners use this reference when a yellow warning lamp and this DTC appear on the diagnostic tool, or when validating a repair on an ISM CM570 engine.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download the full document.
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