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Old 05-27-2019, 12:45 AM
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ABS System

I have a 97 TJ. The 4 cylinder engine cratered.

I bought an 03 TJ Sport that suffered a cosmetically bad rollover.

I stripped the 97 to the tub and frame, sanded it, painted it and robbed the motor mounts from the 03.

I have robbed everything from the 03. From radiator to fuel tank, from ECU to taillights, from steering column to dash, from heater and AC controls to back seat, from cruise control to EVAP, fuel lines, brake lines..... ALL OF IT.

With a few minor required modifications, Im stuffing it all in the 97.

The only thing I have not kept are the 03 axles. They had 3.73 gears and besides that, the the front axle was bent anyway (upper ball joint is bent in about a half inch - trash).

It means Im keeping the 97 axles with the 4.11 gears.

Heres my question(s). The 03 has ABS system. I have no such sensors at each wheel to plug the wiring into.

If I simply leave the wheel sensors unplugged, will I just get an ABS idiot light (the computer disables the ABS system) and thats the worst that happens? Or will it freak out in some other way I havent thought of?

And just for fun, heres another question. As I understand it, each wheel has a grooved ring and an electromagnetic coil that reads the electromagnetic pulses as the wheel turns. If the wheel stops faster than the ECU thinks it should...engage ABS, monitor wheel speed, etc.

Ive also read that the crankshaft position sensor is the same type of sensor (essentially) - reads magnetic pulses, determines RPM (again, as I understand it, could be totally wrong).

If you tapped the signal wire coming from the crankshaft position sensor (which is reading electromagnetic pulses) and fed that into the signal wire that would normally be plugged into the ABS sensors at each wheel, would that cause the computer to always assume the wheels are turning and therefore never engage the ABS, but also never trigger the ABS error or light? Could I fake it out that way?

Ive used everything else, so why not use the sensors and control from the 03 axles? Because I hate ABS. Ill stop it myself, thank you very much.

Or should I just disable the damn light (because I hate error lights, too)?

Or am I totally overthinking a tiny issue? Just leave the sensor wires unplugged and live with the stupid light?

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Old 05-27-2019, 02:11 AM   #2
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You could have kept the front wheel bearings from the 03 and plugged into the sensors... you can still just buy abs wheel bearings w sensors...

Or simply leave the fuse out of the abs system...
Doing so completely disables it.

No you can not tap into the ckps

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Old 05-27-2019, 04:40 AM   #3
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Old 05-27-2019, 07:32 AM   #4
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Better off without it

Yes you can remove the fuse and thaw light bulb from the dash

Other more sig issues
The air bag controller has to be newer style to match the pci bus
The cluster same

Could use early or newer oval face radio but only newer bezel fits oval without modifying

Ac controls are different

If the 03 has skim need its pcm and skim module and chipped keys

No cannot use crank sensor for abs sensor
Not sure if abs sensors are 2 wire induction sensors or three wire hall sensors one makes sine wave other makes square wave

Was either vehicle rear axle a d44?


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Old 05-27-2019, 03:58 PM
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Tapping the crank sensor was just a wild though. The ABS sensors aren’t Hall effect, but two wire.

No, no Dana 44 or I would have kept it. I didn’t even want the ABS so I didn’t want to swap wheel bearings. I’m just neurotic enough that I didn’t want to look at an ABS light on the for the dash rest of my life.

As for airbags, heater controls, gauge cluster... I’ve taken all that out of the 03. There’s nothing left on the 03 but a tub and a frame. It’s all sitting in the 97 now. I’m not trying to mix and match. The computer and all the wiring harnesses and everything they plugged into (except the ABS, of course) is in the 97.

Thanks for the input.
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Old 05-27-2019, 08:50 PM   #6
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Hall sensors typically are three wires power ground and signal




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