SPN 3236 FMI 9 is the Detroit DD Series fault-code procedure for an exhaust mass signal not available over the CAN bus. This 1-page diagnostic PDF documents the fault, its monitored circuit on the Controller Area Network (CAN) exhaust mass flow signal, and the exact troubleshooting steps a technician follows to confirm and repair the failure.
Official document details
| Brand | Detroit |
| Model coverage | DD Series (EPA 2007-Current); Series 60 DDEC VI |
| System / Group | DD Series / DTCs |
| SPN (fault code) | 3236 |
| FMI (failure mode) | 9 |
| Emission family | GHG14 calibration |
| Source | Detroit Power Service Literature (Copyright © 2017) |
| Pages | 1 |
| File size | 0.22 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN 3236, failure mode 9)
- Troubleshooting steps
- Module reprogramming check
- Powertrain CAN diagnosis reference
Applicable truck models
This procedure applies to Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) range and the equivalent Series 60 (DDEC VI) platform, as fitted to Freightliner and Western Star trucks. Confirm the GHG14 emission family matches the truck before following the steps; full model and coverage data is published on the Detroit official website.
Who needs this SPN 3236 FMI 9 manual
Diesel technicians, fleet workshops and mobile mechanics diagnosing an exhaust mass flow signal missing on the CAN bus of GHG14 Detroit engines need this reference to test the circuit correctly with a diesel diagnostic tool instead of replacing parts by guesswork.
SPN 3236 FMI 9 repair steps explained
The procedure first asks whether the ACM2.1, MCM2.1 or CPC4 has been recently reprogrammed; if so, the codes are cleared and the vehicle released when they do not return. Otherwise the technician turns the ignition off, disconnects the diagnostic tool, waits five minutes for all modules to power down, then powers the ignition back on and reconnects a diesel diagnostic tool. If any fault codes are active, the technician follows the full SPN 625/FMI 9 procedure for further Powertrain CAN troubleshooting per Detroit Power Service Literature.
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