The SPN 974 FMI 4 document is a Detroit DD Series diagnostic trouble code guide covering the remote accelerator pedal circuit failed low condition and its step-by-step troubleshooting. This 1 page PDF is compiled from the TruckFaultCodes.com Detroit fault codes reference (© 2017) for the DD Series (EPA 2007-Current) / DTCs set. It is written for workshop diagnostics rather than general reading.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) engines |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Diagnostic trouble code | SPN 974/FMI 4 — Remote Accelerator Pedal Circuit Failed Low |
| Publication no. | Not stated (TruckFaultCodes.com DTC reference) |
| Year / Revision | © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 974 FMI 4 document sections
- Fault code identification: SPN 974/FMI 4 — remote accelerator pedal circuit failed low
- Confirming whether the unit is equipped with a remote accelerator pedal
- Disconnecting the remote throttle switch and CPC connector #3
- Measuring resistance between CPC connector #3 pin 4 and the remote throttle switch (1k ohm threshold)
- Repairing the wire or replacing the remote throttle switch
Applicable truck models covered
The SPN 974 FMI 4 fault applies to trucks fitted with Detroit DD Series (EPA 2007-Current) engines and the associated Common Powertrain Controller and Motor Control Module modules, covering all model years. The procedure references Common Powertrain Controller, remote throttle switch, CPC connector and remote accelerator pedal, and works through measuring resistance across the remote throttle switch circuit, then repairing the wire or replacing the switch. Confirm the engine and emissions configuration against the vehicle build before ordering parts; verify current procedures on the Detroit Diesel official site.
Who needs this 974 FMI 4 manual
This reference suits Detroit-certified technicians and fleet workshop owners diagnosing the remote accelerator pedal circuit failed low condition on DD Series engines. Every troubleshooting step and decision branch from the original PDF is preserved so the on-vehicle diagnosis can be followed in sequence, and the document names the exact connectors, pins and modules involved. Use it alongside a Detroit-compatible scan tool such as DDDL or DDRS.
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