89 S4 ABS Pump Motor Test
Thread Starter
Rennlist Member
Joined: Jun 2021
Posts: 121
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From: Reston, VA (WDC)
89 S4 ABS Pump Motor Test
I did a lot of searching on Rennlist last night but didn't find anything definitive - is there a way to test the ABS pump motor?
I'm chasing the ABS light (comes on within 10' of motion). I've tested the sensor grounds, resistance + a/c voltage at the controller when rotating wheels by hand, replaced the three relays, cleaned the pump ground and 12v connection. I'm planning to buy a cheap scope to look at the sensor waveforms but I wanted to test the pump in the meantime. Thanks, Tom
I'm chasing the ABS light (comes on within 10' of motion). I've tested the sensor grounds, resistance + a/c voltage at the controller when rotating wheels by hand, replaced the three relays, cleaned the pump ground and 12v connection. I'm planning to buy a cheap scope to look at the sensor waveforms but I wanted to test the pump in the meantime. Thanks, Tom
