Using an Innova 3160 scan tool, the tool tells me there are no powertrain DTC's or freeze-frame data presently stored in the car's computer. Going to the ABS part of the enhanced DTC menu tells me there are 5 stored codes, all of them being id'd as "Cxxxx": 01 Lf Wheel Speed/Signal failure 02 Lr Wheel Speed/Signal failure 03 Rr Wheel Speed/Signal failure 04 Hydraulic pump circuit failure 05 Valve Power Feed Failure Given the above, it seems odd that there is no code for Right-front wheel signal failure given the problem with the other 3 wheels. And just an aside, when I try to look at the Transmission DTC's, the tool tells me "unable to establish link with vehicle computer". (the tool gives a menu of different car makers and I chose Chrysler/jeep). I pulled and checked 2 fuses in the engine compartment that are labelled as ABS-related, and both fuses check ok with a meter. The ABS unit is near the windshield fluid reservoir - yes? And it has at least 2 connectors (1 with lots of wires, the other with just 2 wires - yes?) and the connector with 2 wires is for power - yes? I've pulled out and pushed back the 2-wire connector and that didn't change anything. If that is for 12-volt power I'll pull it and see if I get power there. Otherwise I guess I'll have to try to disconnect and re-connect the cable with lots of wires. I've noticed that the ABS and Trac control lights usually stay lit after I start the engine, but once in a while they will go out before I start driving the car but will come on again after driving a short distance (I think when I hit 23 km/hr when I usually hear the click from the ABS test, which I'm not hearing since this started). The tool can (I think) erase the ABS code - is that something I should try? Or should I look at wiring problems first? Maybe there is an un-reparable problem with the ABS unit?