SPN 4358 FMI 5 is the Detroit Diesel diagnostic trouble code set when the DEF metering unit doser heater circuit fails open on DD Series (EPA 2007-current) engines. This 2-page troubleshooting sheet lists the fault definition, the relevant monitor or note data, and a numbered diagnostic routine that ends in the correct wiring or component repair. It is drawn from TruckFaultCodes.com (© 2017) and applies to the EPA10 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — DEF doser heater circuit |
| Suspect parameter (SPN) | SPN 4358 |
| Failure mode (FMI) | DEF doser heater circuit failed open |
| Emissions calibration | EPA10 |
| Verification | pin voltage checks |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format / language | PDF / English |
SPN 4358 FMI 5 table of contents
The DEF metering unit doser heater connector is disconnected and inspected for bent, spread or corroded pins. With the ignition on, voltage is measured between pin 2 on the harness side and ground – greater than 11.75 volts is required, or the wire to ACM2 pin 39 is repaired. Voltage on pin 1 between 2.25 and 2.50 volts calls for replacing the doser heater; otherwise the wire between pin 1 and ACM2 pin 16 is repaired.
- Fault code header
- Troubleshooting steps 1 to 5
- Doser heater connector pin inspection
- Pin-2 supply voltage check (11.75 volts)
- Pin-1 voltage decision (heater versus wire)
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the DEF metering unit doser heater circuit. The SPN 4358 FMI 5 procedure applies to Detroit DD Series (EPA 2007-current) engines running the EPA10 calibration, and the same code index is cross-referenced under the Detroit Series 60 (DDEC VI, EPA 2007) fault-code set. For engine identification and warranty details, see the Detroit Diesel official site.
Who needs this 4358 FMI 5 manual
It is written for technicians resolving an open doser-heater circuit on the DEF metering unit of Detroit DD Series trucks. The voltage thresholds separate a failed heater element from a broken wire to the aftertreatment control module.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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