sepulchrave Posted June 14, 2007 Report Posted June 14, 2007 After three years of superb reliability I have finally come up against something new. The engine will stop immediately and completely at random intervals. When I did a VAG-COM autoscan I had a whole plethora of faults never seen before: Address 01 ------------------------------------------------------- Controller: 021 906 256 Q Component: MOTOR PMC HS Quote
Guest wolfie Posted June 14, 2007 Report Posted June 14, 2007 it's to the right of the oil filter/cooler above the starter motor mounted on the block, held in place by a 5mm Allen bolt, if its the OE part the bolt is locktited in place and can be BITCH to shift! not easy to get at either! also I 'm lead to believe it's not a cheap part! did you have the engine running when the engine speed sensor fault showed up? Quote
28vr6 Posted June 15, 2007 Report Posted June 15, 2007 Those faults all look like they're related to the main electrical plug at the rear right (viewed from front) of the engine block either dodgy connection or water has got in, try wriggling it when running and see if anything changes, if it does inspect it broken / cut wires Quote
sepulchrave Posted June 15, 2007 Author Report Posted June 15, 2007 Thanks for the tips guys, I had noticed that the multi-way connector was stained by water from the failed thermostat housing, although I replaced that a long time ago. I will check that corrosion has not affected the connections inside. The engine will not start if the speed sensor fault is showing, I believe that the PCM cuts the engine as soon as it detects this fault to prevent possible engine damage and that this is the reason the car cuts out. I guess that the speed sensor is some form of hall effect trigger (basically a transistor if memory serves) which is a semiconductor. Probably about Quote
Guest wolfie Posted June 15, 2007 Report Posted June 15, 2007 I've not read of anyone testing it? but with the engine not running apparently both the engine speed sensors and Camshaft Position sensor will show up as faults! Quote
sepulchrave Posted June 19, 2007 Author Report Posted June 19, 2007 Well, It looks like the fault was with the crank position or engine speed sensor as VAG-COM reported. My sensor was Bosch part number 0 261 210 108 which has been superseded by 0 261 210 107. Easy replacement from under the front of the car using an Intermotor pattern part:Intermotor Part number 18791 - Quote
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