P1386

P1386

Knock Control Test Pulses - Signal Implausible

Diagnosis conditions
- Time elapsed after engine start-up > 10 seconds
- Engine speed less than 5,600 rpm
- Knock control active
- Engine load greater than 45 %

Possible fault cause
- DME control module faulty

Affected terminals
-

Diagnosis/troubleshooting

NOTE:
- When a fault is stored, the ignition angle is retarded for all cylinders in the range in which knock control is active.
- Knock control adaptation is inactive.

NOTE: If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.