This starter solenoid lockout relay guide covers Cummins Fault Code 474 (PID S052, SPN 1321, FMI 2) on the M11 CELECT Plus. The 6-page yellow-lamp document explains the ECM-driven driver that isolates the starter while the engine runs.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | M11 CELECT Plus (1995-98) |
| System / group | Starter Solenoid Lockout Relay Driver Circuit |
| Fault code | 474 |
| PID / SPN | S052 / SPN 1321 |
| FMI | 2 |
| Diagnostic lamp | Yellow |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
| Source | Cummins fault code reference (TruckFaultCodes.com, 2017) |
Document table of contents
- Circuit description
- Component location
- Shop talk diagnostic notes
- Step-by-step troubleshooting
- Fault verification and clearing codes
solenoid lockout relay tests
The driver circuit is an ECM-controlled solenoid that electrically isolates the starter motor relay when the engine is running. Shop talk notes that if pin 8 of the actuator harness is not wired and Code 474 is active, the ECM should be recalibrated, and if the fault persists the ECM is replaced; it stresses that this fault applies only to automotive applications, not industrial ones. Troubleshooting begins by disconnecting the relay from the solenoid harness connector pins, inspecting for bent, corroded, or moisture-damaged pins, and measuring relay resistance against the OEM specification.
Applicable truck models
Coverage is the automotive Cummins M11 CELECT Plus (1995-98); the document notes it does not apply to industrial applications. Confirm application type and resistance values on the official Cummins website.
Who needs this solenoid lockout relay manual
Technicians diagnosing starter-isolation faults or verifying automotive-versus-industrial calibrations on M11 CELECT Plus trucks use this chart.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Cummins DTCs
- Cummins M11 CELECT Plus (1995-98)
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