Posted by Ian Slattery on September 29, 2011, 8:35 pm
Year of Manufacture *: 2006 Engine Size and Code *: z12xep ( Optional ) Scanner Used: tech 2 ( Optional) Fault Codes: p1500 p1523 p1526
Car came in with no throttle response. Codes p1500 throttle control motor failure p1523 motor failure p1526 lower limits not learned. p1526 would not clear p1523 and p1500 came back on start up. Check wiring to throttle body 5v feed and earth, two good signals from position sensor.
The motor wires had 3.5v to each one. Checked codes on vaux tis,Replace throttle body On replacing the throttle body it didn't fix the car. Checked the feeds and earths to the ecu ok. Fitted new ecu and the car was fixed. Refitted original throttle body to put new one on a large shelve. Road Tested and went home happy.
Came in this morning and the cars battery was flat, the cars has been in the garage for 4 days with no battery problems. Jumped started car and drove out. put battery on charge for a couple of hours but it didn't take a charge. Jump started car again with battery pack and origonal fault returned.
On asking the owner again on how the fault occurred there was no mention of a flat battery, stopped at a shop and on starting fault occurred.
So my questons are am i missing something on the wiring, should i have left the new throttle body on because the old one is spiking the ecu or jump starting. A new battery is now fitted. Sorry for the long post
>>>>they say vaux policy on warranty claims are they have to be proved.
In there words they have to get a donor car to borrow the ecu off to prove the fault.<<<<
You can understand them having to prove the fault, but wasn't this a permanent fault? Why on earth should a dealer have to use a donor vehicle to prove such a fault? And how long did it take them?
WRT your fault I had a Corsa Z12XEP in a few years back with the same symptoms after another garage had already fitted a pedal sensor. My conclusion was the Throttle body driver in the ECU was at fault which could have been caused by a faulty throttle body. I suggested trying a throttle body first (just in case) as I would be recommending changing it along with ECU anyway. New TB and then new ECU fixed it. I often recommend the suspect driven component is changed as a precaution when I have diagnosed a faulty ECU. (e.g. for ign primary driver fault I would also recommend new coil).
Back to dealer warranty policy, I recently had a Corsa Easytronic with a clutch problem, I had fitted a new Easytronic control module 9 months previous and now it would not actuate the clutch!!! Live data was showing moving of the clutch but I could not see if any actual movement of the pressure plate was taking place. I advised box out in order to check mechanical condition of the clutch components and while it was out the garage fitted a new clutch.
The car then came back to me for bleeding and programming. it took a lifetime to bleed it, but then could not complete the "touch point adaptation" programming. On checking for fluid pressure none was being generated by the integral master cylinder, although live data was showing clutch movement. there is no sensor in the bell-housing so this movement is calculated and based on master cylinder piston movement. I concluded a module fault and was advised by Vauxhall parts that I would have to book it in to the dealer.
It took two weeks and a lot of phone calls for them to confirm fault and fit new module. They should have been able to diagnose that in less than an Hr!!
Hi Mike Totally agree with you. I warned the owner on refitting the old TB. I even used the ford coil as a example. So lesson learned, I should have insisted.
Vaux had the car 4 weeks and fitted a new ecu under warranty. So i probably got away with one there. It doesn't come close to the time i've spent proving new parts are faulty when its no fault of mine.
I wanted to pay for and fit the new ecu myself and send in a warranty form so the ecu could be bench tested. If they found a fault caused by myself then i wouldn't get a refund.
They told the owner of the car the same story of borrowing an ecu off another car to prove the fault.
on October 28, 2011, 9:55 pm, in reply to "