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Can't clear diagnostic fault codes 


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 Post subject: Can't clear diagnostic fault codes
Posted: Sat Jan 12, 2019 2:05 pm 
Getting Side Ways

Posts: 884

Joined: 1st Apr 2005

Gallery: 4 images

Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I have tried to reset the fault codes on my EF XR6 at least 15 times, but they won't clear.

I am using the procedure according to the manual: attach bridge wire to pins A and B, turn key to On, when codes start to appear, remove the bridge wire. It should come up with code 111 to confirm it's clear, but it comes up with the codes it already had. What am I doing wrong?

Also, where are the codes stored? I have swapped ECUs three times, and it comes up with the same codes each time, so the codes can't be stored in the ECU.

Thanks for any and all help.



95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

 Post subject: Re: Can't clear diagnostic fault codes
Posted: Mon Jan 14, 2019 10:16 am 
Getting Side Ways
User avatar

Age: 58

Posts: 869

Joined: 12th Aug 2007

Gallery: 22 images

Ride: AU2 XR8 ute & 91 EA bitsa

Location: Melbourne
VIC, Australia

With the OBD1 scan tool for the EA-ED & EL, the instructions say that disconnecting it before the scan is finished in diagnostic mode will clear any fault codes. Can you try that? I'm not sure if the EF ECU will operate the same.

AFAIK the codes are stored in the ECU memory and should be cleared before each scan (or you are looking at faults that may have been fixed).



AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection

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