312002010 - S013 ENGINE RUMBLING
| Test results | ||||
 | There is a low frequency noise coming from the engine whose intensity varies with the number of revs |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
| Carry out a road test to check the conditions in which the noise occurs. | End of diagnosis | The noise is heard when braking. | Move on to Step 1 | |
| 1 | BRAKE SERVO VACUUM VALVE CHECK | All OK | Problems encountered | Operation |
| Check the condition of the one-way valve on the brake servo vacuum pipe. | End of diagnosis | Brake servo valve faulty. | Replace the brake servo valveOp. 3330D20 |