This SPN 70 FMI 19 reference covers a Detroit DD Series erratic J1939 park brake switch signal reported from source #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 19 |
| Source | TruckFaultCodes.com Detroit fault-code library (Copyright 2017) |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Park brake switch fault overview
- Battery and CAN pre-checks
- CPC configuration review
- ServiceLink module diagnostics
Diagnostic steps in the SPN 70 FMI 19 document
The technician first 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 where needed. If only the J1939 error remains, the document reviews CPC configuration after reprogramming and then uses ServiceLink to confirm which modules are configured and their communication status.
The J1939 park brake switch signal from source #1, #2, or #3 is erratic 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 19 manual
It is aimed at DD Series technicians tracing an unstable park-brake datalink signal across multiple reporting sources.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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