Quote:
Originally Posted by Newbie Tony
Hi everyone
My 2003 XC90 D5 has thrown the fault code ECM 6805 a few times over the last few months. I've replaced the front engine pad (rear was and still is ok), and an elbow out of the VNT governor which had perished and normal service had resumed. Just for info I have today checked the control valve, engine pads and hoses, all pipework between the vacuum pump and control valve and VNT governor including the T pieces with a vacuum pump and gauge and all of that is holding pressure with my vacuum test pump.
I've connected the gauge directly to the outlet nipple on the vacuum pump that feeds the turbo side, and I'm only getting a reading of 15inhg. I believe the figure should be around 28. I've noticed that having connected my gauge, I go in and start the car and get out and walk back round and I can still see the gauge rising slowly up to 15inhg.
I'm thinking I have a problem with the vacuum pump itself but am not sure what exactly. I've read of two problems: leaking oil seals and perished o rings on the brake servo side. I have the quick connector on the bigger hose to the brake servo and it appears ok as do the hoses on the brake servo side of the pump. I'm stumped so any help would be greatly appreciated.
Cheers
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Have you actually tested the pump itself with nothing connected to it ?? ie , just the vacum gauge connected to the big vacuum port on the pump . Yes should be close to 28 in/hg