Member Since: 06 Mar 2017
Location: Lost
Posts: 4679
Does the car drive?yµ (idµ - eAµ) ψ=mψ
16th Jan 2024 5:16 pm
oxtobyd
Member Since: 21 Feb 2023
Location: Lincolnshire
Posts: 24
Car drives with no problems at all really, other than the auto-release of the parking brake doesn't work, the gear indicator in the dash takes a few seconds to change, and likewise the reverse parking sensor is slow to activate. (all related to the XY Sensor and not being able to calibrate it I guess)
16th Jan 2024 5:35 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4679
But the EPB works fine from the switch?yµ (idµ - eAµ) ψ=mψ
16th Jan 2024 6:36 pm
oxtobyd
Member Since: 21 Feb 2023
Location: Lincolnshire
Posts: 24
yep, from the switch i can engage and disengage the park brake no problems, just won't auto release if trying to drive off in gear (which I get as the dash is to slow to recognise it's in 1st, which I'm putting down to the xy senor not calibrating, something I've tried many many times, and no difference)
16th Jan 2024 6:38 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4679
Yeah that's a calibration issue alright but it won't calibrate with a fault code logged.
Did you fit a genuine brake switch? They're very complicated little bu@@ers not like the days of old, and you'd be amazed how they can affect these cars if faulty!yµ (idµ - eAµ) ψ=mψ
16th Jan 2024 6:47 pm
oxtobyd
Member Since: 21 Feb 2023
Location: Lincolnshire
Posts: 24
I can find a note I paid £15, so that tells me it was either after market new, or used original. Maybe worth buying new original (a few new old stock ones on eBay)
16th Jan 2024 7:42 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4679
How is the suspension operating? Does it raise and lower is response to commands?
I'm just wondering if you went after C1A00-88 would it affect the other codes?
This fault (C1A00-88) is likely behind the p/s wheel arch. Once you have it off you will see the cables at the bottom of the wheel well, and they are notorious for corrosion/water ingress.
It's worth a look, as any cracked / damaged cable, or "greening" needs to be sorted out. Sometimes the damage happens right where the cables enter the connector plugs. If so you can use a jumper rather than faffing about trying to repair the connectors.
All repairs needs to be water tight though!yµ (idµ - eAµ) ψ=mψ
16th Jan 2024 7:42 pm
oxtobyd
Member Since: 21 Feb 2023
Location: Lincolnshire
Posts: 24
Suspension all works just fine, no errors etc.
When I get chance I’ll look at the near side wiring under the wheel arch liner (mines a right hand drive so just checking you mean passenger side?)
16th Jan 2024 7:54 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4679
Yep, passenger side.yµ (idµ - eAµ) ψ=mψ
16th Jan 2024 8:14 pm
oxtobyd
Member Since: 21 Feb 2023
Location: Lincolnshire
Posts: 24
Update:
Brake pedal switch changed for New old stock
Grounds behind o/s and n/s wheel arch liners checked and all good
Wiring and plugs behind o/s and n/s wheel arch liners checked and all good
Wiring around ABS all looks ok and plug pins all good
Mmm still getting the VDC Communication errors, and XY Sensor error, maybe a Can Bus issue, but stumped as to what the next course of action is. (I’ve a EPC switch coming but don’t think it’ll make any difference)
Ahhh!
21st Jan 2024 12:13 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4679
The primary fault codes refer to a wiring/connector/short to ground issue or sensor internal wiring failure, and the "U" codes are just a symptom of those faults.
So it seems that if you're 100% certain of the integrity of the wiring, and the tests you have already carried out. Then the only place left for you to go is the XY sensor itself. Not cheap, and difficult to find a used one I suspect.
The only thing I can suggest is a continuity test of the wires from the XY to the ECU/TCM taken at the plug pins before you fire the parts cannon. You'd need to test the same for all the other gearbox components (motors, solenoids, etc) as the system is interconnected.yµ (idµ - eAµ) ψ=mψ
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