AYC help

[jas1]

Lovely day so went for a blast around. Went round a roundabout and the ayc light came on so drove to a petrol station filled up as usual and when ignition turned back on the warning light had gone. Drove about five miles and on it came again! Any ideas would be truly helpful.

 

[evo arm's m7960]

hi mate first thing to check is the fluid level in the boot " right hand side behind the light .

if not hopfully some one on here can tell you how to flash code it .

 

[RsvRob]

check fluid lvl and then tyre pressures as gooner8 found out lol

 

[jas1]

UPDATE
Checked fluid this morning and that is right to the max, so what next? Take it to garage to get checked over. I know you can still drive it but its not nice knowing that there is something not right somewhere>

 

[RsvRob]

as said before check tyre pressures
gooner8 had similar problem and found a very low tyre pressure had triggered the ayc light
otherwise flash the codes out
pin 1 + 4 on the obd port
probably just the pressure switch failing

 

[6.5ghost]

Another AYC problem. Bleed the system a few times and see how it goes, then new pressure switch may be. get fault code if that's no good, hope you don't get code 82( for EVO 4-6)

 

[jas1]

Tried to connect pins 1 and 4 and all I get is the alarm going off all the time!

 

[evo arm's m7960]

i would say thats not pin 1 and 4 then mate . google it to see if you can find a picture as refarence . have never tryed flash coding my self so cant help much on this :O(

 

[evo arm's m7960]

try this

 

[GG205rob]

I think the plug is the other way up to how you expect it to be, pin 1 is bottom right. I think thats on evos but cant remember for sure.

 

[micevo]

yep usual problem, be a weak pump code 81 iirc.. its the hot weather thins the oil and if pump not 100% will put light on, try disconectin your battery and then try it, should keep it off for a few days....

 

[evo arm's m7960]

hi j i belive no 1 is light green wire and no 4 is black wire . and thing these are the codes


27-6 REAR AXLE – Troubleshooting <AYC>
3. INSPECTION CHART FOR DIAGNOSIS CODE
Diagnosis
code No.
Diagnosis items Ref. page
12 Power supply voltage (valve power supply) system (open- or short-circuit) 27-7
21 FR wheel speed sensor system (open- or short-circuit) 27-7
22 FL wheel speed sensor system (open- or short-circuit) 27-7
23 RR wheel speed sensor system (open- or short-circuit) 27-7
24 RL wheel speed sensor system (open- or short-circuit) 27-7
25 Wrong-diameter tire 27-9
26 Faulty wheel speed sensor 27-10
31 Steer sensor (ST-1, ST-2, ST-N) system (open-circuit) 27-11
32 Steer sensor (ST-N) system (short-circuit) 27-11
33 Steer sensor (ST-N) system 27-12
34 Steer sensor (ST-1, ST-2) system (short-circuit) 27-12
41 TPS system (open- or short-circuit) 27-13
51 Longitudinal acceleration sensor system (open- or short-circuit) 27-13
52 Longitudinal acceleration sensor 27-14
56 Lateral acceleration sensor system (open- or short-circuit) 27-13
61 Stop lamp switch system (open-circuit) 27-14
65 ABS monitor system (open-circuit or defective ABS) 27-15
71 Proportioning valve system (open- or short-circuit) 27-15
72 Directional control valve (right) system (open- or short-circuit) 27-16
73 Directional control valve (left) system (open- or short-circuit) 27-17
81 AYC relay system (open- or short-circuit) 27-18
82 Electric pump system 27-19
83 Electric pump system 27-20


good luck buddy

 

[RogerRally]

pressure test

You could do a google search for renting an "AYC pump pressure test Gauge" from erento for £20, that will let you know if its the pump going weak on a hot day, or just a replacement pressure switch needed>
I always find a mechanical test is much better at revealing faults on a hydraulic system than electrical test codes.
hope that helps, Rog

 

[jas1]

Cheers for the input guys, got a bloke coming tomorrow to regas the air con so I might just slip him a drink and ask him to read the code for me. Lazy I know but hey ho!