Traction Control, ABS and ASC Light

[dencoby]

Gday All,
Ive been away from the forum for a bit but now im back.
I have the dreaded 3 light combo giving me grief at the moment.

Things I have checked and tried.

ABS fuses, in cabin and engine bay
Stop light fuse
Hazard fuse
Brake Fluid
Visually checked ABS sensors
New battery 6 weeks ago
Disconnected battery overnight

I have tried 2 obd2 scanners both couldn't check abs system(cheap bluetooth one and a Bosch one)

Does anyone have any further suggestions before sending off to MM?
Is there another way to find out what the fault is? Would rather fix myself.

Thank You

[kiwi1973]

What preceded this fault? Did you cross deep water or were you offroading when it occurred?

Given the tests you've already conducted it is likely to be an ABS sensor. Do you have a multimeter and know how to use it? If so I can put up some basic ABS sensor tests that you can do yourself to see if you can narrow it down to one of the wheel speed (ABS) sensors.

Actually, I guided someone else though some basic testing recently and you may be able to search for my post. Otherwise I'll see if I can find it - if you confirm you're comfortable using a multimeter to test (1) resistance values and (2) test for AC voltage being generated.

[dencoby]

Thanks for the reply kiwi1973

Just started it up on Sunday night to pick up some dinner. Have not been offroad in 6 months.

Im happy to use a test meter no problem, i can also ask the old man if I get stuck.

[kiwi1973]

Here's the basic procedure that hopefully will help you to identify a faulty wheel speed sensor (if one is at fault):


Test 1 - Resistance

Set meter to KOhms. Disconnect each wheel speed sensor and insert a piece of wire or paper clip into the connector (the connector end that goes to the sensor at the wheel) and test for resistance. the reason for inserting wire/paperclip is just because your meter probes won't fit directly. A healthy sensor will read up to around 1.5kohms as I recall. If the resistance is hugely different, or there is no resistance at all, then you've found your faulty sensor.

Test 2 - AC voltage

Jack up each wheel one at a time, with vehicle immobolised and in neutral. Set meter to the lowest AC voltage setting. You'll need someone to hold the meter wires, or use little crocodile clips if your meter has them. Now give the jacked up wheel a spin and test to see if an AC voltage is being generated at the sensor as the wheel spins.

If any connector is found to be dirty/contaminated during the test process then that may also be the cause. They can be cleaned out by spraying liberally with contact cleaner.

I used this procedure on my car just recently and because my fault was intermittent it wasn't until the 3rd test of the front left sensor that it failed the above tests. I replaced that sensor and the issue was solved. (I don't buy sensors from Mitsubishi - Chinese aftermarket ones can be good, but they sometimes have crappy connectors making it important to use dielectric grease when reassembling, or else water contamination may subsequently cause an issue to return).

[kiwi1973]

You can also check that all the teeth are present on the wheel speed rotors. Check none are broken off or obstructed in any way.

[scribble88]

Great bit of advice Kiwi1973. I am not having this issue at the moment, but it is great to know where to look if I have this issue.