Vectra C 1.8 - Abs

Honest John Back Room » Technical matters
View Threaded
Sat 10 Aug 2013 23:09
Vectra C 1.8 - Abs - alfapat
Abs front left abs sensor replaced due to fault showing,checked resistance of front sensors to evaluate fault , both the same fault will not clear
Reply | Report as offensive | Link
Sat 10 Aug 2013 23:44
Vectra C 1.8 - Abs - elekie&a/c doctor

It is not possible to check the resistance of these abs sensors as they are electronic.If there is a fault showing on the left front after sensor replacement,then the fault is either with the hub/wheel bearing,wiring or main control unit.

Reply | Report as offensive | Link
Sun 11 Aug 2013 15:38
Vectra C 1.8 - Abs - alfapat

MANY THANKS FOR YOUR REPLY

are there any values I can check for on the plugs coming down to the front left sensor, this might tell me if its feeding power through.

The hub was new as it comes with the sensor , of course thats not to say its ok.

The plug under the passenger seat is that anything to do with abs please and can I do any checks there?

Any help appreciated.

Thanks in advance.

Pat

Reply | Report as offensive | Link
Sun 11 Aug 2013 16:29
Vectra C 1.8 - Abs - alfapat

tested for power coming down to both fr sensors and they both read .5 mv. , maybe of no significance.

Reply | Report as offensive | Link
Tue 13 Aug 2013 08:09
Vectra C 1.8 - Abs - alfapat

The Vectra c is a sealed unit and I have fitted one due to the fact that it showed a fault code, the resistance across it is 1380 ohms , so that's fine it produces a voltage across the terminals of 120mv while spinning the hub at 2 revolutions to 1secs according to the test I found, checked wiring to inner wing and is fine. Not sure what happens to it after that , tried getting a reading according to test from ecu plug to disconnected plug from sensor and nothing and that result is nil , the test conclusion for this is replace ecu module . I cant really believe that as IF I PRODUCE A FAULT ON DRIVERS SIDE I CAN CANCEL THAT ON THE DIAGNOSTIC BUT NOT ON THE PASSENGER SIDE. I CAN ONLY ASSUME THAT I HAVENT FOUND THE FAULT YET. (Sorry caps)

Reply | Report as offensive | Link
Tue 13 Aug 2013 11:00
Vectra C 1.8 - Abs - dieselnut

I would expect the cable from the inner wing conexion to go direct to the ABS multi-plug. So you should be able to read the 1380 ohms from the multi-plug as long as you know the correct pin no's.

Reply | Report as offensive | Link
Tue 13 Aug 2013 14:13
Vectra C 1.8 - Abs - alfapat
Yep , that will be next I think, the test should prove tha cabling is correct, the terminal numbers I have are for a nubira , daewoo, it's the closet I can find for that fault code test . Terminals 6 and 7 are supposed to be the ones I should look for but one of them is blank and so I ll have to trial and error that one , 6&7 being white and orange I believe.
Pat
Reply | Report as offensive | Link
Tue 13 Aug 2013 21:32
Vectra C 1.8 - Abs - elekie&a/c doctor

Just to clarify the infomation so far.These sensors cannot be tested with an ohms meter ,they are electronic and need a voltage applied to them to operate.The only way to check their output correctly is with an oscilloscope.Also I think you have the incorrect pin data.At the ecu multiplug,the following are the pin out for the sensors;

front left pins 19 and 20

front right pins 7 and 8

rear left pins21 and 22

rear right pins9 and 10.

Reply | Report as offensive | Link
Wed 14 Aug 2013 07:18
Vectra C 1.8 - Abs - alfapat

Ok pins on a con check are ok for 7&8

Pins 19 or 20 are the culprit , cant remember the colour of the good one untill I go out again but its now a case of where the cable is either damaged or disconnected, it looks pretty fool proof until it disappears into the wing , does this cable surface in the passenger side before it goes to the multiplug for instance? I shall have to strip this back near the multiplug to see what happens to it at the bulkhead multi[plug end also.

Reply | Report as offensive | Link
Wed 14 Aug 2013 23:21
Vectra C 1.8 - Abs - alfapat

OK I have found the problem , it was one of the wires just short of the first connector in the inner wing from the abs ecu, weird all fixed now except I had major problems clearing the codes as my diagnostic is playing up.Next thing to fix !

Reply | Report as offensive | Link
Sun 18 Aug 2013 09:43
Vectra C 1.8 - Abs - alfapat

It looks like this system is so fragile. .

I had to eventually resort to slightly twisting the pins on the abs ecu to eliminate the re-occurrance of this fault.

The faults have been affecting the canbus system and preventing coms to the other ecu monitors..

Looks like sorted now, and now the brake lights are staying on.The maf sensor has thrown a wobbly along with the lambdas !

I cant believe this car.

Reply | Report as offensive | Link
Sun 18 Aug 2013 23:05
Vectra C 1.8 - Abs - alfapat

Moving on!

If the MAF is indeed faulty I aim to check this by disconnecting the plug on MAF and hopefully notice a change, would my fault code dissappear if I replace the sensor with new, what I am trying to say if the maf is OK then maybe the fuelling will change and clear the heater codes. WHY is this happening altogether?

Reply | Report as offensive | Link
Mon 26 Aug 2013 11:54
Vectra C 1.8 - Abs - alfapat
I don't think Ifinished my story for the benefit of others , although I found a wire to the abs sensor faulty , with testing the abs ecu I had disturbed the female pins in the plug.Once fixed everything on the diagnostics cleared.
The Maf problem remains a and seems coincidental , however what I need to ask when reding live data on my diagnostics , should the amount of vol indicated read in gms/secs show more than 0.00 when using the acc ?
Reply | Report as offensive | Link
Tue 27 Aug 2013 23:43
Vectra C 1.8 - Abs - alfapat

Omitech is the diagnostic I am using,I have now fitted a new siemens maf fitted and maf sensor still not registering amount of volume of air. No codes for 6 miles to destination , car sat for 1 to 2 hrs., and went to move the car and management light on again . P0100, P0135, and P0141 repeats itself again.
The pther code what worries me is something to do with egr , code P0443.
My original problem lies with resolving the abs sensor and the plug to which I was probing, roughly, seems to affected the can bus connections to the ecu , but I cant see how they throw a problem up on their own through the ecu fault codes while the abs has no faults now.
Anyone with ideas please

Reply | Report as offensive | Link
Fri 30 Aug 2013 13:06
Vectra C 1.8 - Abs - alfapat

OK after a brilliant flash of knowledge picked up on the net I have resolved my issue,

, the fuse f15 certainly says in the book ECM fuse , but has a small footnote to say that if the brake lights are on continuously then the fuse is defective! So having spent sometime on the brake light switch to repair it as the lights are on continuously , this seemed to tie in.
So tested fuse and ok ?
Looked at the handbook again and f14 is oxygen sensor, swapped fuse And left f15 blank , all seems to be fine!!!!
Can't believe it !

Reply | Report as offensive | Link