REDUCTANT Pump Motor Functional Check
The functional check monitors the Pump Motor Speed Deviation. This test is run if the commanded pump speed is within normal operating range, i.e. duty cycle 6 to 30 %. In this test if the internal RPM measurement of the Reductant Pump Motor speed is not matching the commanded speed within a certain percentage, a fault is detected and the system is shut down for this key cycle.
The functional check of the PMC will detect a fault, turn off the pump and transmit the duty cycle that corresponds to the chart above. If there are multiple faults then the one with the highest priority shall be transmitted.
REDUCTANT PUMP MOTOR CONTROL (NORMAL) FUNCTIONAL CHECK OPERATION
| DTCs | P204C - Reductant Pressure Sensor Circuit Low P204D - Reductant Pressure Sensor Circuit High P208B - Reductant Pump Control Range/Performance P20FF - Reductant Control Module Performance P214E - Reductant Pump "A" Current Too High P21CB - Reductant Control Module Supply Voltage Low P21CC - Reductant Control Module Supply Voltage High U040F - Invalid Data Received from Reductant Control Module |
| Monitor Execution | Continuous |
| Monitor Sequence | P208A, P208C, P208D must complete |
| Sensors/Actuators OK | Reductant pump pressure sensor, Reductant injector |
| Monitoring Duration | 5 sec for fault detection |
TYPICAL REDUCTANT PUMP MOTOR CONTROL (NORMAL) FUNCTIONAL CHECK MALFUNCTION THRESHOLDS
| P204C: Voltage < 0.2V P204D: Voltage > 4.85V P208B: > 300 RPM error P20FF: Reductant PMC temperature > 130C OR internal error reported in PMC P214E: Reductant PMC current > 12A P21CB: Reductant PMC voltage < 6V P21CC: Reductant PMC voltage >16V U040F: Reductant PMC duty cycle <4% or >96% or invalid OR Reductant pump feedback duty cycle <5% or >31% |