The SPN 1071 FMI 3 document is a Detroit DD Series diagnostic trouble code guide covering the fan control solenoid circuit short to power condition and its step-by-step troubleshooting. This 3 pages 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 1071/FMI 3 — Fan Control Solenoid Circuit Short to Power |
| Publication no. | Not stated (TruckFaultCodes.com DTC reference) |
| Year / Revision | © 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
SPN 1071 FMI 3 document sections
- Fault code identification: SPN 1071/FMI 3 — a short to power
- Turning the ignition OFF and disconnecting the fan control solenoid connector
- Turning the ignition ON and measuring voltage at pin 1 (11.5 volt threshold)
- Repairing the short to power to MCM 120-pin connector pin 33, or replacing the fan control solenoid
Applicable truck models covered
The SPN 1071 FMI 3 fault applies to trucks fitted with Detroit DD Series (EPA 2007-Current) engines and the associated engine control modules, covering all model years. The procedure references fan control solenoid, Motor Control Module, 120-pin connector and short to power, and works through measuring voltage at the fan control solenoid connector, then repairing the short or replacing the solenoid. 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 1071 FMI 3 manual
This reference suits Detroit-certified technicians and fleet workshop owners diagnosing the fan control solenoid circuit short to power 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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