ABS/Anti lock troubleshooting

[Nappien]

im currently troubleshooting my abs system, as I need it working to get it approved.

When measuring at the ABS ECU harness connector E-12 (pins 33/31) I got zero readings, so I disconnected the Front right Speed Sensor from its Connector and did my meassurment there. I got 975 ohms.

I tried messuring between the connector going into the speed sensor and up to the ABS ECU harness, but no luck. Meassuring between the two pins on the connector I get 13ohms though, so something is between there.

Looking at the Service manual there is a connector called C-33, its the 13 pin connector. But where is it located?

[OhioSpyderman]

C33.jpg

Hope this helps....

Bob.

[Jimvr4]

Is it possible you aren't hooked up to the correct pins at the ABS ECU connector? I remember this was a little confusing but I went through the whole system:

ABS Troubleshooting

[Nappien]

Bob, thanks for the pic. But what a pain in the A** to get to them :P

Jimvr4, the ABS system have worked before, so i dont see how I got the pins wrong. I have meassured pins thru all the pins on the procedure you went thru, and the only pins I cant get any values from are pins 33/31. Even when i take each pins to ground I get nothing.
But checking the speed sensor it self im getting 975ohms.

Heres a pic of the plug going to the speed sensor, small damage.



And this is the cluster of connector where im trying to find C-33 so I can chech the cable.

[Steve '92ES]

The diagram shows those wires as twisted pairs <T>
I would look for a connector that has those color wires twisted together.
(according to your diagram the colors depends on the year of your car)

[OhioSpyderman]

The diagram shows those wires as twisted pairs <T>
I would look for a connector that has those color wires twisted together.
(according to your diagram the colors depends on the year of your car)

Woot...STEVE is BACK

(Haven't seen you posting much Steve...)

Bob.

[Steve '92ES]

Steve never left.... He's mostly been making smart-ass comments in the Dear Granny thread

[Nappien]

I took some pictures of the ABS ECU harness.
The car is a 1992 VR4, im not sure if all the cables are original or not. Looking on the connectors numbers I got a little suprised that there was no wire connected to #33.

front of connector E-12


numbers on the connector:




I counted they way the image Speed Sensor diagram said the connector was numbered, so I hope I got it right, even if on the back there is no cable run to #33

[Steve '92ES]

It looks like the numbers on the connector run backwards from the diagram in the manual.
I took another look at your under dash picture and think I found C-33
(I think if you feel the harness you'll find the black/red and green/white wires are twisted around each other.)
You should be able to find the other end of these wires at E-12.
There are two sets of black/red and green/white wires, one from the front wheels (through C-33) and another from the rear.
The fronts are on E-12 pins 15-14 (Green/White) and 33-31 (black/red)
The rears are on E-12 pins 10-11 (Green/White) and 30-28 (black/red)

[Nappien]

thats what I found out today i just followed the wires from E-12 and back, but what a pain to get to it.

it looks good from C-33 back to E-12, but measuring from Female C-33 back to speed sensor I get nothing. Im looking at a broken wire somewhere. I did see that the cable going back to C-33 had some damage to it, and there is probably more I cant see.

After the weekend im planning on running new wires from Speed Sensor to C-33, or just splicing the new wires to the ones going into the Male C-33 connector..hope this fixes the problem with the anti lock

thanks for the inputs Bob, Jim and Steve