Quote:
Originally Posted by Daim
Reving the engine won't change the steering force as it is SPEED sensitive and not REV sensitive  It gets a signal Al via the ABS sensors or better said a speed output and then will alter the pressure. |
A failing pump will not put out enough pressure at idle engine speed, but will usually be able to develop pressure at higher engine speeds.
If you rev the engine and the steering force becomes lighter, this proves the pump is dying.