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ABS codes


 
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MrG
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Joined: 11 Aug 2018
Posts: 9
Location: Sussex

PostPosted: Sat Aug 11, 2018 20:37    Post subject: ABS codes Reply with quote

I’m wondering if anyone can point me in the direction of abs fault codes for my Isuzu rodeo.  I have put a jumper into pin 4 and 12 on the Obd and have recorded the flash codes. I have eight but I can’t find out what they mean.  Can anyone help out.

Thanks
G


Last edited by MrG on Sat Nov 24, 2018 20:56; edited 2 times in total
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MrG
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Joined: 11 Aug 2018
Posts: 9
Location: Sussex

PostPosted: Sat Aug 11, 2018 21:07    Post subject: Reply with quote

The codes are as follows 21, 25, 26, 27, 31, 33, 77, 82 just a few faults! But what are they?
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eithan h
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Joined: 11 Dec 2005
Posts: 8195
Location: oxfordish

PostPosted: Sun Aug 12, 2018 16:44    Post subject: Reply with quote

21, front right speed sensor short circuit or circuit open
25, front left speed sensor short circuit or circuit open
26, front left speed sensor incorrect signal
27, front left wheel speed sensor signal-tooth chipping
31, rear right wheel speed sensor short circuit or circuit open
33, rear right wheel speed sensor signal-tooth chipping
77, power supply low input
82, 4 wheel drive state input signal failure
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MrG
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Joined: 11 Aug 2018
Posts: 9
Location: Sussex

PostPosted: Tue Aug 14, 2018 9:38    Post subject: Reply with quote

Thanks for the info.  Hopefully these are old errors. I put a multimeter on each of the sensors. Left front stuck out as a bit strange as the resistance continued to rise and would not stay steady. Right front was steady around 4.6mohms which seemed better so have ordered a new sensor for the left front will install and report back
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MrG
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Joined: 11 Aug 2018
Posts: 9
Location: Sussex

PostPosted: Thu Aug 16, 2018 7:50    Post subject: Reply with quote

Replaced the front left sensor. No change all the same codes flagging up. Any ideas? 💡
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eithan h
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PostPosted: Thu Aug 16, 2018 18:13    Post subject: Reply with quote

need to check continuity between the pins on the ecu and the pins at the sensor and check for all feeds and earths at the ecu
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MrG
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Joined: 11 Aug 2018
Posts: 9
Location: Sussex

PostPosted: Sat Aug 18, 2018 19:00    Post subject: Reply with quote

Success!  Good call on the continuity check. Unplugged all sensors checked the continuity from each of pins in the cables back to the plug at the ecu. Sketched a diagram of the ecu plug and identified each pair at the pins in the ecu plug. I then checked the resistance of each pair at the ecu plug and I was getting all different readings from each sensor which to me didn’t look good or the resemble what I metered at each unplugged sensor. May have been some moisture  so sprayed the plug with some wd40 replaced. When I drove 50mtrs the abs light went out.

Last edited by MrG on Sat Nov 24, 2018 20:51; edited 1 time in total
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eithan h
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Location: oxfordish

PostPosted: Sun Aug 19, 2018 12:36    Post subject: Reply with quote

nice! thumbright
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