The DEF coolant valve circuit fault sheet is the official Detroit DD Series diagnostic for a DEF coolant-valve short to battery, stored under SPN 3363 FMI 3 for EPA10, GHG14 calibrations. It records the monitored parameter DEF Coolant Valve, dash lamps MIL, CEL, engine reaction Derate 10%, verification by Output Component Test, exactly as published by TruckFaultCodes.com (© 2017).
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series diesel engines (EPA 2007-current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN 3363 / FMI 3 |
| Fault condition | Diesel Exhaust Fluid (DEF) Coolant Valve Circuit Failed High |
| Monitored parameter | DEF Coolant Valve |
| Dash lamps | MIL, CEL |
| Engine reaction | Derate 10% |
| Verification | Output Component Test |
| Emissions calibration | EPA10, GHG14 |
| Source / Publisher | TruckFaultCodes.com |
| Year / Revision | 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN 3363, FMI 3
- Description and monitored parameter
- Typical enabling conditions
- Troubleshooting steps
- Component inspection and repair verification
DEF coolant valve circuit troubleshooting steps
The sheet has the technician connect the diesel diagnostic tool, run the Output Component Test and repeat it three times while cycling the ignition, then inspect the harness connector and repair a short to battery (12 volts) between pin 1 and pins 8 and 34 of the ACM 120-pin connector.
Applicable truck models
This code sheet applies to trucks powered by Detroit DD Series diesel engines built to the EPA10, GHG14 emissions calibration; always match the SPN 3363 FMI 3 listing to the vehicle’s own engine family before repair. Confirm the emissions family on the vehicle emissions label, because aftertreatment and dosing hardware differs between the EPA07, EPA10 and GHG14 builds and a mismatched procedure can send you to the wrong component. For engine coverage and dealer service information, see the Detroit Diesel official website.
Who needs this DEF coolant valve circuit manual
Fleet technicians and independent workshops that service Detroit DD Series engines use this DEF coolant valve circuit reference to confirm the code, its enabling conditions and the correct repair before replacing parts. It is written for the mechanic making the repair decision, not the driver, and pairs with the wiring diagrams and component removal procedures Detroit publishes in Power Service Literature.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Related manuals library
