| P0400 |
EGR flow malfunction |
- EGR valve incorrectly fitted or loose
- EGR pipe blocked
- EGR valve stuck open/closed
- EGR valve failure
|
Refer to the visual inspection table. Check EGR valve fitment, pipework, etc. For EGR valve circuit tests, Refer to Pinpoint Test A . |
| P0405 |
EGR valve drive circuits low voltage |
- EGR valve power supply circuit open circuit
- EGR valve to ECM drive circuit pair; (EGR valve pins 1/4; 6/3) open circuit, high resistance
- EGR valve failure (stepper motor open circuit)
|
For EGR valve circuit tests, Refer to Pinpoint Test A . |
| P0406 |
EGR valve drive circuits high voltage |
- EGR valve to ECM drive circuit pair; (EGR valve pins 1/4; 6/3) short circuit to ground or high voltage
- EGR valve failure (stepper motor short circuit)
|
For EGR valve circuit tests, Refer to Pinpoint Test A . |