This Detroit throttle position abnormal troubleshooting sheet documents fault code SPN 3464/FMI 18, Intake Throttle Position Abnormal Rate of Change, on Detroit DD Series engines. It commands the intake throttle valve to set positions and checks the actual response with a diesel diagnostic tool. The monitored parameter is the throttle valve, with a 25% derate.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | DD Series diesel engines (DD13, DD15, DD16), EPA 2007 and newer |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 3464 / FMI 18 |
| Emission tier | GHG14 |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Detroit throttle position abnormal table of contents
- Fault code identification: SPN 3464, FMI 18
- Description: MIL lamp, 25% derate and cold-weather note
- Steps 1-3: tool connection and SPN 51 fault check
- Steps 4-6: command ITV to 20%, 90% and 50% and compare
- Steps 7-10: harness inspection and motor resistance test
- Step 11: reviewing extended data for valve icing
Applicable truck models
This GHG14-tier procedure applies to Detroit DD Series diesel engines and covers the intake throttle valve motor and harness. The sheet warns that extreme cold (valve icing) can set the code erroneously, so extended fault data must be reviewed. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit throttle position abnormal manual
Technicians investigating an erratic intake throttle response will use this sheet to command test positions and rule out valve icing before replacement. It suits workshops that must document cold-weather false sets.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download. It is offered for reference alongside your Detroit diesel diagnostic tool. DiagTechPro catalogues Detroit fault-code documents so technicians can locate the exact SPN and FMI they are chasing without paging through a full engine service manual. Each entry lists the page count, file size and emission tier up front, and links to the closely related codes shown below so a diagnosis can move quickly from one fault to the next.
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