This Detroit DEF doser heater document is the factory troubleshooting sheet for fault code SPN 4353 / FMI 4 on GHG14 engines, where the diffuser heater circuit has failed low. It sets the MIL and CEL lamps and walks a technician from the SCR ADS Self-check through a resistance measurement across the DEF Doser Valve heater.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD-Series (DD13, DD15, DD16) and Series 60 (DDEC VI) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 4353 / FMI 4 |
| Fault name | DEF Doser Valve diffuser heater circuit failed low |
| Emissions platform | GHG14 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
| Source | TruckFaultCodes.com (© 2017); Detroit Power Service Literature |
Detroit DEF doser heater sections covered
The two-page procedure moves from confirming the fault to a connector and resistance inspection, ending in a repair-or-replace decision.
- Fault code header: SPN 4353, FMI 4, MIL and CEL lamps
- Connect the diesel diagnostic tool and perform SCR ADS Self-check
- Cycle ignition and repeat the self-check to confirm the fault
- Disconnect the DEF Doser Valve connector and inspect the pins
- Measure resistance across the heater (5 to 10 ohms)
- Repair the short to ground at pin 3 / ACM2.1 pin 22, or replace the valve
Applicable truck models
This sheet applies to Detroit DD-Series (DD13, DD15 and DD16) and Series 60 DDEC VI engines running the GHG14 aftertreatment package with the ACM2.1 control module. Component names and pin numbers match the Detroit SCR dosing system; full removal steps live in Detroit Power Service Literature at the Detroit Diesel official website.
Who needs this Detroit DEF doser heater manual
Any diesel technician chasing an active MIL and CEL on a GHG14 truck needs this DEF doser heater manual to test the circuit before condemning the valve. It saves guesswork by giving the exact self-check, ohm range and pin locations.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download. For workshop reference, Detroit documents the matching component removal and installation steps for SPN 4353 / FMI 4 in Power Service Literature, and technicians should keep the wiring pin numbers shown in this sheet on hand while testing on the bench.
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