This SPN 84 FMI 3 reference documents the Detroit DD Series vehicle speed sensor circuit failed high fault on the EPA10 GHG14 calibration. 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 84 / FMI 3 (EPA10 GHG14) |
| Source | TruckFaultCodes.com Detroit fault-code library (Copyright 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault description and monitored parameter
- Circuit failed high overview
- Harness resistance measurements
- VSS replacement decision
Diagnostic steps in the SPN 84 FMI 3 document
The description block lists the monitored parameter as Vehicle Speed Sensor with a 2-second duration and MIL lamp. Troubleshooting disconnects the VSS and measures resistance from CPC connector #3 pin 13 to VSS pin 1 and pin 14 to VSS pin 2; readings above 3 ohms indicate an open. A final check across CPC #3 pins 13 and 14 above 10 K ohms replaces the sensor, otherwise a harness short is repaired.
The Vehicle Speed Sensor 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 84 FMI 3 manual
This page is for DD Series technicians who need the enabling conditions and exact pin resistance targets for a high speed-sensor circuit reading.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Related manuals library
