AYC Troubleshooting

[Legnooms]

Got AYC Light coming on, with diag codes for Electric pump failure, RR and RL Wheel speed sensor (ABS)
When I first start car, before red AYC comes on I can thrash it down gravel road and the AYC will light up to its various levels but in a short while it stops and just get the red light.
How can I diagnose the harness etc. and is the pump failure alert likely part of the same problem as the speed sensors, or two problems?

Awhile ago I replaced the fuel tank and pinched the speed sensor loom which gave me the double rear error which was remedied by installing a new loom which doesn't appear to have any problems.. It seems unlikely that both sensors would fail at exact same time so how could I test portions of the loom to isolate the break?

 

[naughtika]

From experience your issue would be due to uneven wear on your RR and RL tires.

See if you can swap them to your front tires. Assuming they are good

 

[Legnooms]

Were your codes also (Short or Break) errors, or just system error?
I will be getting new tyres when I get the chance so that will sort that out but it seems to be indicating more of a damaged connection or something..?

 

[naughtika]

mine happened in this step.. 1. ayc light bars all lit up. 2. red ayc light came up then 3. the abs light came up

when I turned it off, the error disappeared. But after a while the same error came up.. That's when I realized it was the wear on either side were uneven

 

[Legnooms]

Ah so you didn't catch the diagnostic error codes?
In the time it's been sitting the back left Tyre has gone flat soooo Tyre replacing time anyway

 

[naughtika]

i actually did, I used evo scan to acquire them.

also different tire pressure add to the issue as well...