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Old 01-28-2013, 05:42 PM   #1
SJwrx
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Member#: 14970
Join Date: Feb 2002
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
1997 GF8
multi

Default ABS code 25: before I order an ABS unit

Hello again my friends,
Long story short I bought a 2002 WRX over the weekend with 195,xxx miles on it on the ultra cheap ($2050), so suffice it to say, it has a few 'issues'... one being a stubborn ABS code 25.




Initially when I bought the car it had the ABS light on, SES (CEL) on, low coolant, and so on... so what do you do? Pull off at Chevron, fill all the fluids, do a battery reset for 30 minute and see whats left over.

ABS light was still on, so the mystery continued. I came home, pulled up the service manuals, and found how to read the codes (two long, 5 short = 25) and have ABS code 25 (right rear ABS sensor electrical fault).

Cleared ABS codes via test procedure, code 25 is instantaneously back... me thinks an electrical issue.

The connectors end up being under the back seat, check voltage and ohm the wiring out, 4.7v and 18 ohms.... 18 seems a but high so of course, you compare to another corner... the left rear corner has the same values...hmmm.

So I took apart the RR just in case of something 'odd' happened in between connectors at the RR ABS sensor and the chassis harness (under back seat), nothing.

As one last check I uplugged both LR and RR ABS sensors just to see if the ABS unit was monitoring them all, re-read codes, still only ABS code 25 (even with the LR also unplugged, should have triggered another 'open circuit' fault).

... from this tests I'm concluding the ABS ECU is biased on the RR, hence the permanent fault. Differing opinions?

-Richard

PS. I dont have an oscilloscope, only a Fluke 88 just FYI.
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Last edited by SJwrx; 01-28-2013 at 06:27 PM.
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Old 01-29-2013, 11:51 AM   #2
SJwrx
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Location: San Jose, CA
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1997 GF8
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Nobody in a whole day?

-Richard
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Old 01-29-2013, 03:12 PM   #3
jamal
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my wheels fit

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Quote:
Originally Posted by SJwrx View Post
ABS light was still on, so the mystery continued. I came home, pulled up the service manuals, and found how to read the codes (two long, 5 short = 25) and have ABS code 25 (right rear ABS sensor electrical fault).

Cleared ABS codes via test procedure, code 25 is instantaneously back... me thinks an electrical issue.
You need to check the code with a code reader. I'm pretty sure you can't count flashes like with ODB1 cars.

And it is likely a wheel speed sensor is unplugged or loose or damaged or something.
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Old 01-29-2013, 10:27 PM   #4
SJwrx
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Join Date: Feb 2002
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Vehicle:
1997 GF8
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Default

Quote:
Originally Posted by jamal View Post
You need to check the code with a code reader. I'm pretty sure you can't count flashes like with ODB1 cars.

And it is likely a wheel speed sensor is unplugged or loose or damaged or something.
As per the Subaru manuals you can, as on said "screenshot".

Thanks for the input though

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Old 02-01-2013, 06:51 PM   #5
WiRX
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If you need a unit I have two I could give you a deal on one of them.
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Old 02-02-2013, 10:36 AM   #6
Scooby921
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I hope by "ABS unit" you mean new wheel speed / abs sensor for the right rear corner as that's what your trouble code seems to identify as the problem. I expect the sensor to be a whole lot cheaper and a lot less PITA to replace.
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Old 02-02-2013, 12:46 PM   #7
SJwrx
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Member#: 14970
Join Date: Feb 2002
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Location: San Jose, CA
Vehicle:
1997 GF8
multi

Default

Quote:
Originally Posted by Scooby921 View Post
I hope by "ABS unit" you mean new wheel speed / abs sensor for the right rear corner as that's what your trouble code seems to identify as the problem. I expect the sensor to be a whole lot cheaper and a lot less PITA to replace.
I was initially leaning that way too, simple code = simple repair. So come to find out the previous owner had the sensor replaced... no dice. I have the receipt and have visually verified the part is "newer" in comparison to the other sides.

Plan of action, switch the ABS sensors from left to right (rear), clear the code, and see if the fault 'travels'
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