Detroit DEF pump circuit faults set a DEF dosing derate on DD Series (EPA 2007-current) engines, and this Detroit Diesel sheet documents the high-side circuit diagnosis for the EPA10 and GHG14 calibrations. 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 / GHG14 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — DEF pump circuit |
| Suspect parameter (SPN) | SPN 4375 |
| Failure mode (FMI) | DEF pump circuit failed high |
| Emissions calibration | EPA10 / GHG14 |
| Dash lamps | MIL, CEL |
| Engine reaction | 25% derate |
| Verification | SCR air pressure test |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format / language | PDF / English |
Detroit DEF pump circuit table of contents
Diagnosis begins by running the SCR catalyst air-pressure system check for a 60-second duration to see whether the fault becomes active; if it does not, the check is repeated three times, cycling the ignition between each test. When the fault confirms, the DEF pump harness connector is disconnected and inspected for bent, spread or corroded pins. If the pins are good, the sheet calls for repairing the short to battery (12 volts) between pin 2 of the connector and pin 20 of the ACM 120-pin connector.
- Fault code header and copyright
- Description: monitored parameter, lamps and derate
- SCR air-pressure system check (60-second, repeated three times)
- Troubleshooting steps 1 to 7
- Short-to-battery wiring repair at pin 2
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the DEF pump feed circuit for the airless dosing system. The Detroit DEF pump circuit procedure applies to Detroit DD Series (EPA 2007-current) engines running the EPA10 / GHG14 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 Detroit DEF pump circuit manual
It suits diesel technicians chasing a DEF dosing derate on EPA10 and GHG14 Detroit DD Series engines. The air-pressure verification method and the pin-2 wiring repair let a shop confirm the fault and fix it in one visit.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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