OBD11 Reader Help

[EMM]

Hello All,

My ABS light has come on intermittent. Sometimes I’ll brake and the abs just cuts in then boom light.

I’ve been to a few garages and non can pull the code and Yeap it has an MOT due Tuesday.

Does anyone have a reader that will read the codes in the Gloucester area? I have a 1995/6 T5 850

Andy

[Cookeh]

You need a flash code reader. Have a search in this forum for it, or on matthewsvolvosite.com. Tonnes of links explaining what it is, how to do it, and what you'll need to make it.

[Luxobarge]

Also, cracked or corroded reluctor rings on the front hubs are favourite for this, I know it's guessing and you really need the codes, but checking the rings is free, if you've got time to get under there and have a close look. Changing them is fairly easy and very cheap.

[EMM]

Thanks for all the help.

I have made a home made ODB2 flash reader and managed to pull the following codes

1-3-2
1-3-4
2-3-1
4-1-4
4-1-8

But nothing to do with the ABS or I haven't found the right pin.
Never thought of the ABS rings.

However I did notice that the ABS module has never been replaced so I'm going to get that sorted.

[dingov70]

Hello there , OK here we go

Follow this link & you will acquire the full listing of codes for each module . Make sure you are reading the right module as you may well misread the error code , the same flash sequence occurs for differing problems .

A quick solution for diagnosing ABS faults is to use an analogue multimeter , lift a wheel enough to turn it , unplug sensor , connect multimeter to the pins FROM the sensor , set to lowest voltage range & spin the wheel . IF the sensor is working , you will notice the needle move everytime the sensor triggers . A digital multimeter will not notice the voltage in the same way as the analogue one .

Before replacing ABS module make damn sure everything else is functioning , it's a lot of money to find you still have the same issue

[Cookeh]

You need to be reading the codes off pin A3 for the ABS system. Here is a list explaining all, and the code meanings:

click me.

Based off those flash codes, it looks like you were on pin B1 for the ECC system.

[EMM]

I pulled the module and will get it repaired as its peanuts and then I can rule it out. It does not look repaired at all.

However from my understanding only Volvo software can read the ABS codes? Sorry if that is incorrect.

I did speak with Volvo yesterday and they said 9/10 it’s the module

I’ll let you know what happens.

[Bob Meadows]

If the ABS module is anything like the one for a ’97 V70? Then I would look at the repair method covered by the form advice: ~ also did a bit of a write- up when I completed the same, it is quite straight forward if you have a soldering iron the solder joints to the right of the circuit board are the main culprits – the lid is also easily removed without butchering! Please see article for further details.
Trust it may help.
Bob.

[Cookeh]

Originally Posted by EMM

I pulled the module and will get it repaired as its peanuts and then I can rule it out. It does not look repaired at all.

However from my understanding only Volvo software can read the ABS codes? Sorry if that is incorrect.

I did speak with Volvo yesterday and they said 9/10 it’s the module

I’ll let you know what happens.

You can get the codes from the pin A3, in the same way as you got the codes you got first time - just need to make sure you're on the right one!

Module is an incredibly common failure point, but so are the connections from the speed sensors to the module - worth checking the resistance there. Here's an explanation on how to do it: click me.

Another common failure occurs if you swapped your suspension to anything other than Sachs - they have an additional cable mounting grommit that can wear through the speed sensor cabling and cause grounding issues. Easy to check too.