Intrusive WASTEGATE Monitoring (2014)
The intrusive wastegate monitor operates on the same principles and has the same entry conditions as the intrusive VGT monitor. It runs once the VGT monitor completes, using the same commanded VGT position (85%) and an EGR valve position up to 10%). The wastegate is commanded to 5% open for 2 seconds, then 95% open for 2 seconds. The minimum and maximum EBP values are saved and compared to a threshold. If the desired separation in EBP pressure isn't achieved, a fault is detected.
WASTEGATE MONITOR
| DTCs | P1249 - Wastegate Control Valve Performance |
| Monitor Execution | Once per driving cycle |
| Monitor Sequence | VGT, then wastegate |
| Sensors OK | ECT, MAP, VS |
| Typical Monitoring Duration | 4 Seconds for full wastegate monitoring |
TYPICAL WASTEGATE MONITOR ENTRY CONDITIONS
| Entry Condition | Minimum | Maximum |
| Engine speed for learning | 500 rpm | 760 rpm |
| Pedal position allowed for learning | 0.5% | |
| Engine coolant temperature for learning | 70 deg C | 124 deg C |
| Fuel quantity allowed for learning | 20 mg/stoke | |
| Vehicle speed for learning | 3 mph | |
| Loop counts after brake cycle | 800 counts | |
| Barometric Pressure | 67 kPa | 102 kPa |
| Time since start | 120 seconds |
TYPICAL WASTEGATE MONITOR MALFUNCTION THRESHOLDS
| Response from 5% wastegate position to 95% wastegate position in 2 seconds results in a change in exhaust backpressure of 2.0 kPa or greater at sea level or 1.25 kPa at 8000 feet. |