This SPN 70 FMI 2 reference covers a Detroit DD Series park brake switch J1939 signal that is erratic, intermittent or incorrect across sources #1, #2, or #3. 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 70 / FMI 2 |
| Source | TruckFaultCodes.com Detroit fault-code library (Copyright 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Erratic park-brake data overview
- Battery and CAN pre-checks
- CPC configuration review
- ServiceLink module diagnostics
Diagnostic steps in the SPN 70 FMI 2 document
The technician checks for a Common Powertrain Controller battery-voltage code (SPN 168) and a Motor Control Module SPN 625 FMI 9 fault, repairing the Controller Area Network line first if present. When only the J1939 error remains, the document confirms CPC configuration after any reprogramming and uses ServiceLink to identify configured modules and their communication status.
The J1939 park brake switch signal from source #1, #2, or #3 data erratic, intermittent or incorrect 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 70 FMI 2 manual
It is for DD Series technicians whose park-brake datalink value is intermittently wrong rather than fully missing.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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