SPN 3242 FMI 10 is the Detroit DD Series fault-code procedure for a failed diesel oxidation catalyst inlet temperature sensor. This 2-page diagnostic PDF documents the fault, its monitored circuit on the diesel oxidation catalyst (DOC) inlet temperature sensor, 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) | 3242 |
| FMI (failure mode) | 10 |
| Emission family | EPA07 calibration |
| Source | Detroit Power Service Literature (Copyright © 2017) |
| Pages | 2 |
| File size | 0.26 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN 3242, failure mode 10)
- Troubleshooting steps
- Upstream Motor Control Module connection checks
- Sensor replacement and parked regeneration
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 EPA07 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 3242 FMI 10 manual
Diesel technicians, fleet workshops and mobile mechanics diagnosing a failed DOC inlet temperature sensor on EPA07 Detroit engines need this reference to test the circuit correctly with a diesel diagnostic tool instead of replacing parts by guesswork.
SPN 3242 FMI 10 repair steps explained
The technician disconnects the DOC inlet temperature sensor and inspects the connector for damaged, bent, spread or corroded pins, then checks the upstream Motor Control Module (MCM) connections: the Aftertreatment Device (ATD) harness 10-pin connector pin 6, the VIH 31-pin connector pin 18, and the MCM 120-pin connector pin 89. If damage is found the connectors are repaired; if everything is sound, the sensor is replaced and a parked regeneration is performed using DDDL, following Detroit Power Service Literature.
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