SPN 974 FMI 2 is the Detroit DD Series diagnostic sheet that explains remote accelerator pedal supply voltage out of range on GHG14 engines. This code can appear when the remote accelerator pedal is programmed ON and the remote pedal circuit is shorted to power or ground. The sheet has the technician confirm the unit is actually equipped with a remote accelerator pedal, then turn the ignition ON, disconnect the remote throttle switch and measure the supply voltage from CPC4 connector #3 pin 4. A reading above 4.5 volts points to a short to power, while a low reading points to an open wire back to the switch. This DiagTechPro library page outlines what the 1 page PDF contains before you download it.
SPN 974 FMI 2 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | Remote accelerator pedal supply |
| Fault code (SPN / FMI) | 974 / 2 |
| Fault type | Remote accelerator pedal supply voltage out of range |
| Emissions platform | GHG14 |
| Source | TruckFaultCodes.com (Copyright © 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI reference)
- Fault description and affected circuit
- Step-by-step troubleshooting procedure
- Parameter configuration and connector checks
- Circuit repair instructions
Applicable truck models and engines
This fault sheet applies to Detroit DD Series engines built to the GHG14 emissions platform. It is used with the Detroit diesel diagnostic tool, and with ServiceLink where module configuration must be confirmed. Detroit publishes these fault codes through TruckFaultCodes.com, and the same SPN can appear on more than one module, so confirm the reading before ordering parts. For engine coverage and official service literature, see the Detroit official support site.
Who needs the SPN 974 FMI 2 sheet
Fleet technicians and Detroit-certified workshops troubleshooting this Remote accelerator pedal supply fault need this sheet to follow the correct checks instead of guessing at parts. It also references the OEM literature for schematic detail and the A&I manual for correct Common Powertrain Controller (CPC4) configuration, so it fits workshops verifying a remote-throttle build.
The complete 1 page PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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