323001367 - S013 ENGINE RUMBLING

There is a low frequency noise coming from the engine, which varies in intensity with the rpm.

		TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Carry out a road test to check the conditions in which the noise occurs	Move on to Step 1	1. The noise is heard when braking2. The noise is heard when steering	1. Move on to Step 12. Move on to Step 3
1	BRAKE SERVO VACUUM VALVE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the one-way valve on the brake servo vacuum pipe	Move on to Step 2	Brake servo valve fault	Replace the brake servo valve.
2	HYDRAULICALLY ASSISTED STEERING PUMP CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine running, turn the steering wheel to the end of travel in both directions	End of diagnosis	Pump noise	Replace hydraulically assisted steering pump.