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Dmitri: Why do you keep saying remove the ECU instead of just remove the fuse in the red S26/S102 fuse holder above the ECU (for say, 10 minutes or whatever to drain down anything in the capacitors). Are you thinking that there is a connection issue with the 55 pin T55 connector?
Had the car read today with a non Vag-com system today. Didn't plan on it but the guy swore that vag-com was basic and his lap top run system was much better so i thought i may as well give it a go!
The readings came up suggesting a fault with the wiring to the ECU temp sensor as in intermittant shorting/earthing. I was sceptical as the vag-com had shown nothing towards this, but to confess not to have checked what the temp reading was
I pulled back the insulating boot expecting another dead end and found that the two wires were twisted over each other and somehow both wires insulation had worn off and the bare wires touching and had been for some time by the look of the wire. Until i can get that length of loom and plug to solder in i have taped the wires with insulation tape. Not had time to go out in the car yet though.
Am i right in thinking this could cause my running fault???
Yep! The fuelling would be rich if the sensor tells the ecu the car is cold rather than at running temp!
It will depend on what information the ecu sees from that sensor. It does fit in with our "Its on the car" theory and in principle with fuel delivery problems. It would basically be getting too much fuel if the temp sensor info was not accurate.
A messed up G62 coolant temp sensor (the one the ECU uses to determine fueling requirements) would definitely cause running issues, e.g. running rich because the ECU thinks the engine is still cold when in fact it has warmed up to 87 C.
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I have a slack-ish morning tomorrow so will take it out for a blast!! But to be honest, its been 5 years now of finding stuff it could be so i'm not getting my hopes up too much
Had the car read today with a non Vag-com system today. Didn't plan on it but the guy swore that vag-com was basic and his lap top run system was much better so i thought i may as well give it a go!
No. The 2 wires to it had twisted over eachother where a new sensor had tightened in a new position ans as a result the insulation had worn off both wires allowing the bare wires to touch intermittantly then permamently!!!!
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Might these wires shorting and not (as it started as an intermittent fault) of damaged the ECU at all??
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