Detroit SCR NOx efficiency is measured by the aftertreatment control module, and this Detroit Diesel sheet documents the very-low-reading fault on DD Series (EPA 2007-current) GHG14 engines. This 3-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 GHG14 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — SCR conversion efficiency |
| Suspect parameter (SPN) | SPN 4364 |
| Failure mode (FMI) | SCR conversion efficiency very low |
| Emissions calibration | GHG14 |
| Dash lamps | MIL |
| Engine reaction | 25% derate |
| Verification | parked regeneration |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format / language | PDF / English |
Detroit SCR NOx efficiency table of contents
After repairing any DEF quality fault, the sheet confirms DEF concentration at 28-36% with a refractometer, then checks all DEF lines for kinks, cracks and leaks. The dosing unit is unbolted from the exhaust (hoses and connector left attached) and a DEF quantity test must dispense 108-132 mL (3.7-4.5 oz.). A parked regeneration then verifies that the conversion reading rises and stays above 85% (0.85) before the truck is released.
- Fault code header and description (derate and verification)
- Troubleshooting steps 1 to 10
- DEF concentration, line and quantity checks
- Charted parameters and parked regeneration
- Release criteria and support escalation
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR catalyst and DEF dosing unit. The Detroit SCR NOx efficiency procedure applies to Detroit DD Series (EPA 2007-current) engines running the 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 SCR NOx efficiency manual
It is written for aftertreatment technicians on GHG14 Detroit DD Series trucks where the conversion reading has dropped far enough to derate the engine. The 108-132 mL dosing window and 85% regeneration target give a clear yardstick for judging the dosing unit and catalyst.
The full 3-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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