2G ABS light

[Justin DuBois]

How does one go about diagnosing a ABS light? Occasionally it turns off, but right now it is on all the time.

 

[streetraceboi]

Take out the bulb

 

[Widgmaster]

Take out the bulb

... Come on...That's not the answer the man is looking for but I have to agree. That is one fix for sure... And you know what...it will never bother him again.
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I found a post that talks about the ABS light... maybe you will find this helpful...

https://www.dsmtuners.com/threads/does-low-tire-pressure-trigger-abs.536679/#post-153828163

 

[luv2rallye]

Reading 2g ABS diagnostic trouble codes:​

https://www.dsmtuners.com/threads/reading-2g-abs-diagnostic-trouble-codes.197283/

 

[Justin DuBois]

Reading 2g ABS diagnostic trouble codes:​

https://www.dsmtuners.com/threads/reading-2g-abs-diagnostic-trouble-codes.197283/

I have a 95 model year, manufactured in 94, (one of the early 2G) so does that mean the trick here won't do anything?

 

[luv2rallye]

Only way to know is try it and see. I've heard stories both ways. As the article says: It doesn't work for the earlier Nippondenso ABS ECU.

 

[Justin DuBois]

If I have one of these earlier ABS computers, and the diagnostics codes don't flash - what next?

 

[luv2rallye]

The most common reason is one of the wheel's abs sensor wires broke. I'd inspect those. May have to remove the wheel to look at the wire going into the hub.

 

[Justin DuBois]

Anyone ever try the volt meter method?

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Is it as simple as putting two pins into the OBDII port and measuring the voltage between them?

 

[pauleyman]

I've never checked any OBD2 stuff this way but for ABS yes it appears that is true. It's just like checking engine codes on a 1g. You will need an analog meter or a meter with audible tones for voltage.
I couldn't find how it will output to tell you what the code is. The codes are on the next page but it just lists numbers. I suspect it will read out like morse code like obd1 engine codes. Count the blips etc.

 

[Tyeler18]

Yes it'll beep out just like a 1g long and short tones. I saw somewhere one of your other posts stating the light comes on and stays on after it's self test. If that's the case and you're not driving the car that's a hard fault failure like the module isn't seeing voltage, ground, fuse etc. Wheel speed sensor failures usually wont trip the light until moving, I dont know that the ABS module does a circuit self test on the wheel speed sensors. If it does an open wheel speed circuit would auto trip the light, but I've run with wheel speed sensors unhooked and don't recall an ABS light until moving.

 

[luv2rallye]

You can try it. Maybe it works on your 95 with the ABS ECU you've got. Looks like you ground pin 1 (or jumper it to pin 4 which is ground), and connect voltmeter to pin 12 to read voltage pulses. Report back if this works.

 

[Justin DuBois]

You can try it. Maybe it works on your 95 with the ABS ECU you've got. Looks like you ground pin 1 (or jumper it to pin 4 which is ground), and connect voltmeter to pin 12 to read voltage pulses. Report back if this works.

I tried a few different sequences. I never saw the meters needle move.

some of my confusion is trying to figure out which side of the OBD2 connector is pin 1 when looking at it like this:

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[luv2rallye]

When looking at it like that pin 1 is in the lower right corner. Which makes pin 12 be the 4th one from the right on the top row.

 

[TJCTalon]

I tried a few different sequences. I never saw the meters needle move.

some of my confusion is trying to figure out which side of the OBD2 connector is pin 1 when looking at it like this:

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Did anything come of this? I have an anti lock light on, not an ABS and im trying to figure out whats going on with mine.

 

[Diamond Star Werks]

I have some reading for y'all.

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[Justin DuBois]

I’ve disabled ABS

My wheel sensors where all fused in place - so after the first one didn’t survive removal - the decision was made for me.

 

[Diamond Star Werks]

I’ve disabled ABS

My wheel sensors where all fused in place - so after the first one didn’t survive removal - the decision was made for me.

Heat, lube, and the patience of Job

 

[chrisman287]

I’ve disabled ABS

How did you go about doing that? I’ve been considering doing the same.

 

[99dsmer4g63]

How did you go about doing that? I’ve been considering doing the same.

You need a Non abs proportioning valve.

I used factory non abs lines but that is a thing of the past unless you find a parts car.

So you would still need new lines from the master to the valve and from the valve to the two front wheels.

STM sells a kit.

-Daniel