SPN 3242 FMI 7 is the Detroit DD Series (EPA 2007-current) diagnostic fault sheet for the DOC inlet temperature signal not responding condition on the DOC inlet temperature sensor circuit. It notes that the ACM2.1 detected no temperature shift on the DOC inlet temperature sensor and points to an intermittent wiring concern, then uses the SCR and DPF voltages service routine to wiggle-test the signal and check the harness. The sheet is written for heavy-duty technicians who pull this diagnostic trouble code with a diesel diagnostic tool and need the confirmed factory step order rather than guesswork.
SPN 3242 FMI 7 document details
| Brand | Detroit (Detroit Diesel) |
| Model coverage | DD13, DD15 and DD16 — DD Series (EPA 2007-current) |
| System / Group | DOC inlet temperature sensor / DTCs |
| Fault code | SPN 3242 / FMI 7 |
| Emissions platform | GHG14 |
| Source | TruckFaultCodes.com fault-code reference (© 2017) |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 3242, FMI 7
- DOC inlet temperature signal not responding
- Intermittent wiring concern note
- SCR and DPF voltages service routine wiggle test
- Harness inspection and repair
Applicable truck models
This DOC inlet temperature signal not responding procedure applies to Detroit DD13, DD15 and DD16 engines built on the DD Series (EPA 2007-current) aftertreatment platform (GHG14 calibrations) and is cross-listed for Series 60 DDEC VI (EPA 2007) installations that share the same DOC inlet temperature sensor. Removal and installation callouts refer to Detroit Power Service Literature, and the Detroit Customer Support Center (800-445-1980) is the authoritative escalation point. Full model and engine coverage is confirmed on the Detroit Diesel official website.
Who needs this SPN 3242 FMI 7 manual
Workshop owners, mobile diesel technicians and fleet maintenance teams reach for this manual the moment a scan tool reports SPN 3242/FMI 7. It keeps the diagnosis on the manufacturer’s confirmed path, which shortens repair time and avoids replacing a good DOC inlet temperature sensor. The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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