This Cummins fault code 496 PDF is the official Sensor Supply Voltage Circuit troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID S221, SPN 1043, FMI 11/11 and the Yellow warning lamp. It is a step-by-step diagnostic flow, not a general manual, and it takes a technician from symptom to confirmed repair on this specific code.
Cummins fault code 496 explained
The ECM supplies the camshaft engine position sensor with positive 5 VDC, and if the supply line is damaged the sensors will not work correctly. The camshaft engine position sensor is on the intake side of the engine block, on the cylinder head to the right of the ECM. Low voltage on the positive 5-VDC supply line is caused by a short circuit to ground, a short between a supply and a return line, a failed sensor, or a failed ECM power supply.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Sensor Supply Voltage Circuit |
| Fault identifiers | Fault Code 496, PID S221, SPN 1043, FMI 11/11, Yellow lamp |
| Source / Revision | TruckFaultCodes.com, Copyright 2017 |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Fault code verification and clearing
Applicable truck models
This chart applies to on-highway trucks and equipment built on the Cummins ISM, ISX and Signature CM570 (1999-02) engines with the CM570 electronic control module. Because component and battery locations vary by chassis maker, the document repeatedly refers you to the OEM manual for exact positions. For engine specifications and dealer support, see the official Cummins engine site.
Who needs this Cummins fault code 496 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Sensor Supply Voltage Circuit correctly instead of guessing at parts. It pairs with a diagnostic scan tool and standard shop meters.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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