The Detroit DEF coolant valve fault sheet is the official Detroit DD Series diagnostic for a DEF coolant valve open circuit, stored under SPN 3363 FMI 5 for EPA10, GHG14 calibrations. It records the monitored parameter DEF Coolant Valve, dash lamps MIL, CEL, engine reaction Derate 10%, verification by Engine Idle (1 minute), 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 5 |
| Fault condition | Diesel Exhaust Fluid (DEF) Coolant Valve Circuit Failed Open |
| Monitored parameter | DEF Coolant Valve |
| Dash lamps | MIL, CEL |
| Engine reaction | Derate 10% |
| Verification | Engine Idle (1 minute) |
| Emissions calibration | EPA10, GHG14 |
| Source / Publisher | TruckFaultCodes.com |
| Year / Revision | 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification: SPN 3363, FMI 5
- Description and monitored parameter
- Typical enabling conditions
- Troubleshooting steps
- Component inspection and repair verification
Detroit DEF coolant valve troubleshooting steps
The sheet has the technician disconnect the DEF coolant valve connector, inspect the harness for bent, spread or corroded pins, then measure voltage and resistance between the DEF coolant valve harness connector and the ACM (ACM2) using the table for the fitted DEF tank size, repairing the wiring or replacing the valve as the results direct.
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 5 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 Detroit DEF coolant valve manual
Fleet technicians and independent workshops that service Detroit DD Series engines use this Detroit DEF coolant valve 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.
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