This Detroit intake throttle valve troubleshooting sheet documents fault code SPN 3464/FMI 31, Intake Air Throttle Control Electrical Fault, on Detroit DD Series engines. It confirms the fault, then measures ITV harness resistance to ground and back to the MCM. The monitored parameter is the throttle valve, with a 10% 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 31 |
| Emission tier | EPA10 / GHG14 |
| Publication no. | Detroit Power Service Literature (via TruckFaultCodes.com, © 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Detroit intake throttle valve table of contents
- Fault code identification: SPN 3464, FMI 31
- Steps 1-3: confirm the fault with key-cycle sequence
- Steps 4-5: disconnect the ITV and MCM 120-pin connectors
- Steps 6-7: pin 4 and pin 5 resistance to ground (1k ohm)
- Steps 8-9: pin 4/5 resistance to MCM pins 100 and 101
- Decision: repair wiring or replace the throttle valve
Applicable truck models
This procedure applies to Detroit DD Series diesel engines certified to EPA10 and GHG14 standards. It checks the intake throttle harness pins against MCM pins 100 and 101, with removal covered in Power Service Literature. See Detroit’s official service literature portal for the authoritative Detroit repair procedures.
Who needs this Detroit intake throttle valve manual
Technicians chasing an intake-throttle electrical fault will use this sheet to trace shorts to ground and open wiring before replacing the actuator. It suits workshops working on Detroit emissions air-handling faults.
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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