This SPN 51 FMI 3 reference documents the Detroit DD Series intake air throttle circuit failed high fault and its harness voltage checks. It is part of the DiagTechPro truck manuals library and preserves the original TruckFaultCodes.com Detroit fault-code library (Copyright 2017).
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-current) engines; the same fault-code procedure is also filed under the Detroit Series 60 (DDEC VI, EPA 2007) group. |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 51 / FMI 3 |
| Source | TruckFaultCodes.com Detroit fault-code library (Copyright 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault description and engine reaction
- Multiple-code open-circuit check
- Throttle harness voltage measurements
- Sensor supply diagnosis
Diagnostic steps in the SPN 51 FMI 3 document
When companion codes on SPN 3563 and SPN 411 accompany this fault, the document repairs an open circuit at Motor Control Module (MCM) 120-pin connector pin 117. If only this code is present, the intake throttle valve connector is disconnected and, with the ignition on, voltage is measured between harness pins 2 and 3 and expected to read between 4.5 and 5.5 volts before checking the sensor supply to ground.
The Intake air throttle circuit failed high condition on Detroit DD Series trucks is read and cleared with DiagnosticLink (formerly DDDL); the SPN and FMI pair identifies the exact circuit and failure mode. Confirm the code is active and capture freeze-frame data before running the pinpoint tests, then clear it and road-test the truck to verify the repair has held.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-current) engines; the same fault-code procedure is also filed under the Detroit Series 60 (DDEC VI, EPA 2007) group. For factory service data, parts and warranty information, consult Detroit’s official DD engine support.
Who needs the SPN 51 FMI 3 manual
It is for DD Series technicians verifying the throttle sensor supply voltage when the circuit reads high.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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