This DEF doser valve heater sheet documents Detroit fault code SPN 4353 / FMI 3 on GHG14 engines, where the diffuser heater circuit has failed high. The fault turns on the MIL and CEL lamps, and the procedure isolates a short to battery from a failed heater element.
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 3 |
| Fault name | DEF Doser Valve diffuser heater circuit failed high |
| Emissions platform | GHG14 |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
| Source | TruckFaultCodes.com (© 2017); Detroit Power Service Literature |
DEF doser valve heater sections covered
The two-page flow confirms the fault with the SCR ADS Self-check, then uses a resistance check to split a wiring short from a bad component.
- Fault code header: SPN 4353, FMI 3, MIL and CEL lamps
- Connect the diesel diagnostic tool and perform the SCR ADS Self-check
- Cycle ignition and repeat the self-check to confirm the fault
- Disconnect the connector and inspect for bent, spread or corroded pins
- Measure resistance across the heater (5 to 10 ohms)
- Repair the short to battery (12 volts) at pin 3 / ACM2.1 pin 22, or replace the unit
Applicable truck models
The steps cover Detroit DD-Series (DD13, DD15 and DD16) and Series 60 DDEC VI engines on the GHG14 platform with the ACM2.1 aftertreatment control module. Removal instructions for the doser are published in Detroit Power Service Literature, available through the Detroit Diesel official website.
Who needs this DEF doser valve heater manual
This doser valve heater manual is for the technician who reads SPN 4353 / FMI 3 and needs to prove whether the wiring or the heater is at fault. The measured ohm range and pin map keep the diagnosis factory-accurate.
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 3 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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