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Exactly. The ecu seems to be working, as when I unplug the black 4 pin connector to the pump, it instantly flashes a code 11 for open circuit.

Not sure if this helps any, but right before the ABS light illuminates, (usually within the first 10 seconds of moving), I can hear loud solenoid noise from the engine bay which must be the ABS pump activating, then the ABS light illuminates. When shutting off power, the light goes out until the...

Not sure what you mean by “twisted pair”. Those 2 wires are as separate as the PSEN wire. Do you know where a standalone EMS would get the VSS from? I always thought it was the rear speed sensor. I run the AEM v1 EMS and the vehicle speed reading is very accurate on throttle. Goes pretty haywire...

Any reason I can’t adjust these settings? Any value I change defaults back to 6000. Doesn’t seem like I can adjust much of anything, as if the settings are locked. Any idea how to unlock them?

It looks like any other Supra abs sensor.

Well that doesn’t bode well. :(

Did the sensor throw a fault when you had the those wires swapped incorrectly?

I remember at one point I tried to activate the abs pump by shorting connector B’s SRR, SFL, and SFR to positive. It did not work. In sheer frustration, I thought I had my connectors confused and did the same thing to Connector A and it sparked when I shorted GND, obviously. The abs ecu was not...

The light does not go off below 6 mph. Once it comes on, it stays on until cleared.

Test plan shows the use of an Oscilloscope. Any way around this? I wish I could just ohm the sensor out to make sure it isn’t damaged. Even if the wiring is correct, the sensor may be toast from before I swapped the +/- wires, yet still isn’t throwing a fault code.

Pireatip does brought up a good point. Once cleared, the abs light does not illuminate until driving the vehicle for over 100ft. Like it’s getting a discrepancy in sensor readings. So thinking I might have had or currently do have the rr+ and rr- wires swapped, which may have internally shorted...

I can’t remember how I figured out the wires were swapped, but that’s going to be the first thing I check.

I’m gonna try another ecu off a friend next week. Clearly an earlier model than the last 2 I tried as his has a single label with green writing. Doubt it’ll work, but worth a shot.

Before the tear down the abs worked correctly. My old rear wheel speed sensor went with the auto trans, but the r154 came with one. However the wires where cut and discolored. Originally I had the rear left and right wires flip flopped. But the correction didn’t seem to make a difference. When...

Car is Frankenstien'd man. Different rear ABS sensor (came with the r154), pretty sure it has a manual harness swapped from the original automatic one, both were gray plug tho. ABS ECU should be the original from 1990. The test one I installed today came out of a 89. Part numbers on it are shot...

Tried a different ABS ECU and same thing. Light initially off, comes on within the first 20 seconds of driving. Light flashes rapidly when in diagnostic mode, signifying no faults. Now what?

Ok, so a flash every half a second means there are no faults. I clear them. Light is off, 10 seconds of driving light goes solid. Remove the diag connector and get constant quick flashing, which apparently means the system is working correctly. What the hell?

What does it mean when the abs light constantly flashes when pulling codes. Just none stop quick flashing. TSRM says nothing about it. Unless it’s a bad ECU, but that should be a solid light according to the TSRM, unless I’m reading that wrong. Ideas?

What did you mean by "TMS Harness Bar is dangerous"? I've ran mine for years without issue. Haven't wrecked tho. Can you elaborate?

I've had good luck with Second Skin. Here's an old thread of the install: http://www.supramania.com/forums/showthread.php?98641-Operation-quot-Can-t-hear-shit-quot-*Pics*