Cummins M11 code 412 is the Cummins troubleshooting document for the Datalink Circuit – Vehicle fault (PID S250, FMI 3, SRT 00-608). The vehicle data link lets the service tool communicate with the ECM and other onboard electronic devices over the SAE J1587 protocol through an OEM harness connector. It sets a yellow warning lamp and lists the exact conditions, causes, and step-by-step checks a technician follows.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins M11 CELECT electronic engines built 1990 to 1994 |
| System / Group | M11 CELECT (1990-94) |
| Fault identifiers | PID S250, FMI 3, SRT 00-608 |
| Warning lamp | Yellow |
| Pages | 4 |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop Talk
- Step-by-step troubleshooting steps
- Fault code clearing and verification
Trucks covered by Cummins M11 code 412
This procedure applies to Cummins M11 CELECT electronic engines built 1990 to 1994. The procedure carries the Cummins fault identifiers PID S250, FMI 3, SRT 00-608 for reference and repair-time tracking. It is set by electromagnetic induction, shorted or reversed data link wires, or improper voltage on the vehicle data link, and typical effects include intermittent or lost communication on the vehicle data link. For engine specifications and dealer support, see the official Cummins website.
Who needs this Cummins M11 code 412 manual
Heavy-truck technicians, fleet maintenance teams, and workshop owners diagnosing this fault use it to confirm the code before replacing parts. During diagnosis the vehicle data link connector may be a 2-pin Packard, 6-pin Deutsch, or 8-pin AMP type, and interference sources are eliminated before wiring is condemned. The step-by-step tree starts by reading active and inactive codes with the diagnostic tool, then inspects the harness and connector pins for bent, corroded, pushed-back, or expanded pins, flushing them with electronic contact cleaner Part Number 3824510 before any component is condemned. Test leads run around the bulkhead are used to isolate a faulty OEM harness, and the code is rechecked and cleared once the repair passes.
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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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