137 replies to this topic

[slindborg]

ahh, the S word, on a harness.... that'll be the problem

[G-Bob]

Has the EGR been checked?  I had similar problems when my egr stopped working.

 

Also, Does the car have it's undertrays in place?

[Goldfinger]

Interesting ...No I have not checked the EGR yet although the OBD showed this as working ??

 

I believe that the undertrays are in place correctly, if they are not on correctly does this cause an issue? 

[Goldfinger]

OK this car is officially a piece of crap.......

the only thing the petrol in the tank might be good for is .............................

 

To recap 

 

I have done the following 

Taken apart the soldering job that was done by a previous owner having a hissy fit with the var for which I can totally endorse and sympathise. Re cut and re-soldered all connections and have continuity tested joints and can confirm that all of the wires are now have electric continuity

I have removed the coil pack and cleaned all of the coils, I dont really think it can be this as there are no issues with starting the car but as a process of elimination....

I have cleaned and dosed with contact cleaner any visible connectors including but not limited to;-

 

ECU connectors

Throttle body connectors

EGR valve connector. (Not replaced this yet)

Small connector block on the sensor/ECU on the coil pack

Removed and cleaned the connector on the ECU on the front right hand side of the bonnet area

Checked and continuity tested all fuses where I can find them

removed and soaked the relays in the boot.

 

I have tried wherever possible to "push together " the female connectors but I have to say I am not convinced that I have managed to get all of these tightly together as some of them for the ECU for example I am convinced that I am going to damage them not repair them !!!!

 

I have today replaced the accelerator pedal 

I have run an OBD diagnostic and tried a re-set the code shows

P1271

P1275 and interestingly I have a new code P1635 which is the 5v differential code across the ECU according to threads

 

When I re-set the codes the p1635 goes off so long as the connector on the Throttle Body remains on if I disconnect the TB connector then the re-set will continue to show 3 faults and will not clear to 2. I suspect that I have an issue in the TB and I have a replacement part arriving thanks to Pidgeon and Acid. (who have been very helpful.

 

So short of removing the connectors everywhere and direct soldering the wires to the component part such as the TB and Throttle Pedal 

 

My next move thinking over this is to get a new ECU from somewhere and then I am dry of ideas other than to try to get a replacement loom from somewhere which is likely to come with its own set of issues and then ................................

 

Anyone have any thoughts? Also the car might be known to some of you as it has a VX220.org sticker in the back window

 

 

[Paulus H]

Someone like Liam at MMG will just fix it for you. A days cost but done. Kindly, Paul

[Pidgeon]

Do you have somewhere offroad and undercover to work on the car?  I may be able to come over one evening next week and run through a few likely fixes.

[slindborg]

have you actually unplugged the ECU connectors? This is sounding more and more like corroded ecu pins (and then worst case, corrupt ECU, but both are a new ecu job)

[Goldfinger]

Sorry yes I have removed and visually inspected connectors.

 

Actually I am suspecting a short on the throttle body and pedal sensor wiring.

 

Pidgeon I cant believe your generosity, thank you for your offer I do have a mate who is a bit of a wiring loom buff who has offered some help when I run out of talent which is about now. He lives up the road from me so to save putting you out I will let him loose and see what he can deduce, but stand by we might need your advice and help yet. Thank you very much

[speedster]

Before you rip up the wiring...Have you ruled out the ECU? You should be able to temporary swap the ECU with another. If your ECU is toasted the swapped unit should operate the throttle, the car won't start though (imobiliser recode required).

[Goldfinger]

Not sure 

 

I have a spare ECU however it produced the same error codes so I am ruling out the ECU for the moment !!!

 

 

[speedster]

Is the throttle actually operating when you press the throttle pedal, that is, is the butterfly valve (throttle plate) seen moving on visual inspection? Also have you check voltage output of the throttle position sensor?

[Goldfinger]

No the throttle butterfly is not actually operating, it is not opening and closing

The throttle position sensor shows 34% I have changed the throttle with another unit and this has not cleared the fault.

I have checked the voltage outputs and these vary up and down according to the throttle position as they should, however the throttle percentage remains at 34 %

 

[Goldfinger]

By the way is the butterfly supposed to be fully closed for normal tick over or is it slightly open?

[speedster]

Slightly open. Have you tried an alternate throttle body?

[Goldfinger]

Going to try an alternate throtle body tonight courtesy of Scott ( TheHood, many thanks indeed) I am hoping that I can zero down on things it is not: as described and then try to attack things it could be, if that makes sense.

 

So far I think I have ruled out the Throttle pedal itself as I have tried a different one and had no sucees. However this does not rule out the 5v circuit to the TPP Sensor itself, The TB and MAC and the ECU. Finally the wiring and any associated short circuit to power or ground within the loom and or connectors. I think I am going to need someone with better diagnostic equipment than the multi meter I have at my disposal

 

Ultimately I am in a slow process and I would like a quick fix.

[slindborg]

unplug the pedal, does the throttle still read 34%?

[FLD]

Buy an op-com.  Seriously!  They are about 15 quid on ebay and worth every penny for issues like this.  There is a throttle diagnostic tool that shows pedal input / tb output etc that will be useful

[Goldfinger]

Hi I have an OBD reader and using Easy OBD software 

What are you using as my software only tells the throttle response which varies from 33-34%

 

Hope that this helps

[FLD]

Hi I have an OBD reader and using Easy OBD software 

What are you using as my software only tells the throttle response which varies from 33-34%

 

Hope that this helps

 

OP-COM software.  Its vauxhall (opel) specific and has loads of useful funtionality such as the throttle load test.

[Goldfinger]

As an update last week all pedal sensor circuits were tested for continuity from pedal connector to the ECU to the throttle boday. All circuits showed continuity. So I sent the ECU for test. Result was that there was substantial water ingress and damage to the ECU and the ECU pins. On test the water damage was found to throw the pedal APP sensor fault

 

Waiting for the ECU to be returned which has been rebuilt and resealed and tested, so fingers crossed this has now resolved the problem.