Year of Manufacture *: 2008 Engine Size and Code *: 1968cc ( Optional ) Scanner Used: VCDS
This may be useful
This is a customer I have not seen for a while. He called to say that the vehicle had just cut out at a junction and non restart
AA relayed to a local garage and they came up with 6 codes, checked all fuses, swapped a few parts including new fuel filter and 2 days later gave up, it was then relayed on to me
005121 EGR Valve (N18) Short to ground 012546 Motor for Intake Manifold flap (V157) No signal 012545 Motor for Intake Flap (V157) Open or short to ground 000581 Solenoid Valve for boost pressure control (N75) Short to ground 006422 Relay for coolant After Run (J151) Short to ground 005377 Fuel pump relay (J17) Short to ground
I also checked all the fuses but could not see any blown.
Checking with the customer, he then told me he had a scan a few months back as the MIL came on and he thinks it was for the Intake Manifold Flap
I then checked on Vivid all the fuses to see if there was any one common to most of the faults (components)........Fuse 34 (10 amp)
Went back to the car again and this time pulled the fuse out and when held up to the light it had a hair line gap, replaced fuse, cleared all codes and this time fuel pump primed and it started
5 minutes later it stopped with fuse blown again. The customer agreed to change the Intake Manifold Flap valve. The cars now been running fine for a few days
Lesson learned, just because the fuses look ok, they may need a closer inspection (should have gone to spec savers)
Peter
PS: This time I got the Throttle Valve from Camberley PIE 7.14393.26.0 £253.95 retail £194.97 trade
Don't you think,Peter, that these fault code descriptions are very misleading? A 'short to ground' is suggested in 5 of your 6 codes.The fault turned out to be the very opposite of this i.e. an open in the positive supply.
Hi David. The Fault codes are not misleading, If you think about it, If the circuit has lost the feed or +ve supply, There is nothing left apart from a Negative or a Ground. ??
i,e .... The Ecu can only see that the circuit has gone to ground, It has no +ve reference. ??
I think you're interpreting it incorrectly. The short to ground is saying an electrical short, ie. the control unit is seeing a low voltage and thinks the positive is being shorted to earth. A short to positive is when the control unit sees higher than normal voltage.
Hope that makes sense. Matt
edit: sorry was typing the same time as Tony. Hopefully you can gather some explanation from us =)
Thanks Tony and Matt your explanations,helpful indeed.Clearly it was the inlet manifold throttle motor that was shorting to ground(blowing fuse 34),the other components simply had their supply voltage missing.The engine ECU does not know why the voltage is missing.
>>> this time pulled the fuse out and when held up to the light it had a hair line gap <<<
I find quickest & best way of testing fuses is with a old style 4 watt bulb test pencil, with the circuit live touch on both side of fuse, if one side fails to light you have found the fault. saves pulling fuses & you can quickly run through all the fuses if need be.
on May 19, 2011, 1:01 pm