Circuit description
The Cold Start Emission Reduction Strategy (CSERS), which shortens the time necessary for the catalyst to warm up after cold start, is used in this vehicle. The CSERS consists of related ignition timing and increased engine idle speed in calibrated time. This monitor detects estimated exhaust gas temperature which has not reached the target value, ignition timing from the ECM, and engine idle speed failure.
| DTC No. | DTC detection conditions | Suspected parts |
|---|---|---|
| P050A | From the cold engine condition, the engine speed not reach the target engine speed within 7 seconds. (2 trips detection logic) |
|
| P050B | Despite abrupt warming control of the catalyst, ignition timing is not retarded for 7 seconds (to delay ignition timing). (2 trips detection logic) |
MONITOR STRATEGY
| Related DTCs | P050A: Cold start emission reduction strategy functional check P050B: Cold start emission reduction strategy functional check |
| Required Sensors/Components (Main) | Throttle body |
| Required Sensors/Components (Related) | Intake air flow meter ASSY Vacuum sensor E.F.I. water temperature sensor |
| Frequency of Operation | Once per driving cycle |
| Duration | 7 seconds |
| MIL Operation | 2 operation cycle |
| Sequence of Operation | None |