Cummins fault code 489 is a yellow-lamp diagnostic trouble code for the Cummins ISM CM570 (1999-02) engine platform, documented in this 6-page troubleshooting PDF covering the auxiliary speed input error. 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 | 489 |
| Identifiers | PID P191 · SPN 191 · FMI 1/18 |
| Warning lamp | YELLOW |
| Pages | 6 |
| 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 489 circuit description
The auxiliary speed input is a frequency signal from an auxiliary speed or pressure pickup. It is sent to the electronic control module (ECM) and is used to control the engine speed. Auxiliary reference speed is based on the throttle position. The auxiliary speed governor controls engine speed based on a measured auxiliary speed or pressure. The ISM CM570 diagnostics in this file are indexed as PID P191, SPN 191 and FMI 1/18, 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 489 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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