ABS light always on

[troyboy162]

after i got back from deployment i noticed my abs light is always on. i had wanted to disable it anyhow but i dont like broken things so i looked into it.

first step is to look at the wheel sensors. there is one on every hub and it will be the thing with the black wire going into it. it looks more like a tiny black rubber hose then a wire but you will see it. about two feet up the wire you will find where it plugs into another harness. inspect these for obvious wheeling damage or issues. when i did this i found the front left connector was dangling and rattling around

next step if that dosnt resolve it is to get your abs code. you cant do it with a ecu reader so follow the steps in this post:
http://www.yotatech.com/f132/t100-abs-light-102354/#post50371738

The ECU doesn't show ABS codes. The OBDII interface doesn't show ABS codes. The ABS computer is where you pull ABS codes from, and it only comes from:
Turn the ignition ON (don't start the engine)
Pop the hood
Find the "DIAGNOSTICS" connector that's on the drivers side of the engine, on the high edge of the intake plenum.
Pop the top, and you'll see something like:
Code:
+---+---+---+
| | | |
+---+---+---+
| | | |
+---+---+---+
| | |E1 |
+---+---+---+
| |
+---+---+---+
| | | |
+---+---+---+
| |Tc | |
+---+---+---+
+---+---+---+
| | | |
+---+---+---+
+---+
|sp |
+---+
(front of truck)
In the lower left, you'll find a small plug that pulls out. That's a "shorting pin", pull it.
Now use a piece of wire to jumper from E1 to Tc
Look back at the dash, the ABS light should be blinking.
The blinking is in a pattern. For example, if you see BLINK-BLINK {pause} BLINK-BLINK-BLINK {long pause} {repeat} that would be code "23"
Once you get the code, pull the jumper wire from E1/Tc, put back the shorting pin, and confirm that you can start the truck.
Find the code, post it back here and we'll take it from there.




then use this post for the code:
http://www.toyotaownersclub.com/forums/index.php?showtopic=54453&view=findpost&p=541388


Code 11
Open in solenoid relay circuit. Check actuator wiring harness, solenoid relay, solenoid relay wiring harness and solenoid relay connector.
Code 12
Short in solenoid relay circuit. Check actuator wiring harness, solenoid relay, solenoid relay wiring harness and solenoid relay connector.
Code 13
Open in pump motor relay circuit. Check actuator wiring harness, pump motor relay, pump motor relay wiring harness and pump motor relay connector.
Code 14
Short in pump motor relay circuit. Check actuator wiring harness, pump motor relay, pump motor relay wiring harness and pump motor relay connector.
Code 21
Open or short circuit in solenoid for right front wheel. Check actuator solenoid, wiring harness and connector.
Code 22
Open or short circuit in solenoid for left front wheel. Check actuator solenoid, wiring harness and connector.
Code 23
Open or short circuit in solenoid for right rear wheel. Check actuator solenoid, wiring harness and connector.
Code 24
Open or short circuit in solenoid for left rear wheel. Check actuator solenoid, wiring harness and connector.
Code 31
Malftmnction of right front wheel speed sensor signal. Check speed sensor, sensor rotor, wiring harness and connector.
Code 32
Malfunction of left front wheel speed sensor signal. Check speed sensor, sensor rotor, wiring harness and connector.
Code 33
Malfunction of right rear wheel speed sensor signal. Check speed sensor, sensor rotor, wiring harness and connector.
Code 34
Malfunction of left rear wheel speed sensor signal. Check speed sensor, sensor rotor, wiring harness, and connector.
Code 35
Open in left front or right rear wheel speed sensor circuit. Check speed sensor, sensor rotor, wiring harness and connector.
Code 36
Open in right front or left rear wheel speed sensor circuit. Check speed sensor, sensor rotor, wiring harness and connector.
Code 37
Rear speed sensor rotor malfunction. Check rear sensor rotors.
Code 41
Battery voltage is less than 9.5 volts or more than 16.2 volts. Check battery and voltage regulator.
Code 51
Actuator pump motor is locked or pump motor circuit open. Check pump motor, pump motor relay, vehicle
battery, actuator wiring harness, connectors, actuator pump motor circuit and actuator ground bolt.
ABS Light Always On
Malfunction of ABS ECU. Inspect ABS ECU connector for proper installation and undamaged terminals.
Repair as necessary. If connector is okay, temporarily substitute known good ABS ECU. Retest system

To Clear the Codes:
Make sure you replace the short pin from the DLC
Connect a jumper Wire between TC and E1
Press Brake pedal 8 or more times within 3 seconds
ABS light will go out within 3 seconds

sure enough my front left wheel speed sensor is not working as expected. fixing it is up to you from there, but im leaving mine broke. abs has scared the hell out of me off road. wanna experience it? go down a super steep sand/rock hill in 2H and see how little your breaks do. do you like roller coasters? haha

[4x4mike]

Good info. Several times the ABS has kicked in on a trail and it scares the crap out of me. For that matter it's done it a few time on road in the rain and I don't like how sensitive it is. Good to know how to troubleshoot if I do have problems.

[L33T35T Tacoma]

wanna experience it? go down a super steep sand/rock hill in 2H and see how little your breaks do. do you like roller coasters? haha

That's why I always have my e-locker on, it diables the ABS :D



Good info. Several times the ABS has kicked in on a trail and it scares the crap out of me. For that matter it's done it a few time on road in the rain and I don't like how sensitive it is. Good to know how to troubleshoot if I do have problems.

Mike, as far as I know, if your ABS light is on, it means the computer has detected a fault and it simply disables the ABS. As it says in one of the links that Troy posted "No ABS is better than an unpredictable ABS"

[Crinale]

haha, my 2nd gen only came with abs on the rear axle, and i blocked it off :-P the sensor is just tied up against my gas tank now