chris123
Well-known member
Before I ask the question, here's what I've done so far. I have a FSM, and followed most of the procedures in the diagnostic section. I've replaced the modulator assembly with a known good unit, including the wiring harness, since that had some corrosion on the terminals where it connected to the modulator. All 3 relays have been tested, as well as the diode. Fuses are good. The ABS light will come on for a second or two when the ignition is turned on, then a couple of relay clicks, and then go out. It will light up when the engine is cranking, and then go out as per FSM. One of the only tests I haven't performed yet is ohming out each of the wheel sensors. I did remove the front 2, cleaned them, and re-installed them. Haven't had a chance to do the 2 rear ones yet.
Here is the question: The ABS system will not perform the self-function test at 4-5 mph; if the system is not getting 4 correct signals from each of the sensors, will that prevent the self diagnosis test from ever happening? After I get up to 7-8 mph, the ABS light will come on and stay on until the next key/ignition cycle. Not sure if the next step is to focus on the ABS main computer/controller, or possibly one or more of the wheel sensors. I guess ohming out each of the sensors might reveal more info, however I just wanted to know first what prevents the system from not performing the self-diagnosis check at the 4-5 mph range. Not even sure I can find new aftermarket sensors if I do happen to need one. Hopefully I won't have to mess around with used ones.......
Regards, Chris
Here is the question: The ABS system will not perform the self-function test at 4-5 mph; if the system is not getting 4 correct signals from each of the sensors, will that prevent the self diagnosis test from ever happening? After I get up to 7-8 mph, the ABS light will come on and stay on until the next key/ignition cycle. Not sure if the next step is to focus on the ABS main computer/controller, or possibly one or more of the wheel sensors. I guess ohming out each of the sensors might reveal more info, however I just wanted to know first what prevents the system from not performing the self-diagnosis check at the 4-5 mph range. Not even sure I can find new aftermarket sensors if I do happen to need one. Hopefully I won't have to mess around with used ones.......
Regards, Chris