REDUCTANT Dosing Valve Functional Check
The functional check monitors the movement of the injector needle. When the injector needle reaches its upper position (injector open, begin of injection period) a discontinuity in the slope of the dosing valve current occurs.
This functional check monitors the presence of this discontinuity. If it does not occur the injector is either stuck open or stuck closed. In both case the system cannot be operated and will be shut down.
REDUCTANT INJECTION FUNCTIONAL CHECK OPERATION
| DTCs | P208E - Reductant Injection Valve Stuck Closed (Bank 1 Unit 1) |
| Monitor Execution | Once per injection stroke |
| Monitor Sequence | P208E is inhibited by active P2047, P2048 or P2049 |
| Sensors/Actuators OK | Reductant pump motor, Reductant pressure sensor |
| Monitoring Duration | 50 injection strokes for fault detection |
TYPICAL REDUCTANT INJECTION FUNCTIONAL CHECK MALFUNCTION THRESHOLDS
| No calibration thresholds available, fault information is sent directly from power stage |