EGR System Monitor
Operation
EGR SYSTEM MONITOR OPERATION
| DTCs | P0401 (insufficient flow), P0402 (excessive flow) |
| Monitor execution | Once per driving cycle |
| Sensors components OK | MAP, MAF, TP, ECT, IAT, Barometric pressure, Back-up power |
| Monitoring Duration | 3 s |
Enable conditions
EGR SYSTEM MONITOR ENABLE CONDITIONS
| Parameter | Minimum | Maximum |
|---|---|---|
| Engine coolant temp. | 55 (131) °C (°F) | 110 (230) °C (°F) |
| Idle switch on duration time | 1 s | |
| Battery voltage | 10.47 V | |
| Engine speed | 1500 rpm | 4000 rpm |
| Vehicle speed | 50 (31) km/h (mph) | |
| Engine speed change | 172 rpm/s | |
| MAP sensor change | 4.95 kPa | |
| EGR operation time | 30 s | |
| Time from engine start | 240 s | |
| Time from switch change (AC, PSS, P/N position switch, ABS, Electric load) | 6.4 s | |
| F/C mode | On | |
| IAT | -8 (17.6) °C (°F) | |
| Barometric pressure | 74.5 kPa | |
| EGR circuit continuity | No DTC | |
| Misfire | No DTC | |
Typical malfunction thresholds
EGR SYSTEM MONITOR TYPICAL MALFUNCTION THRESHOLDS
| P0401: MAP difference between EGR on & off < 2.2 - 5.3 kPa (according to Engine speed) |
| P0402: MAP difference between EGR on & off < 11 - 25 kPa (according to Engine speed) |