Speed Sensor Diagnostics

NOTE: During wheel speed sensor diagnosis, ABS functions like a standard brake system.

Ensure battery is fully charged. Turn ignition on. Verify ABS warning light illuminates, then turns off after 3 seconds. If ABS warning light does not illuminate, check fuse, bulb, and wiring harness. See ABS WARNING LIGHT CIRCUIT under SYSTEM TESTS.
Turn ignition off. Connect a fused jumper wire between DLC1 terminals Ts and E1. See Figure. Apply parking brake. Start engine. DO NOT press brake pedal. ABS warning light should flash 4 times per second.
Drive vehicle at speeds greater than 28 MPH for several seconds. Stop vehicle. Connect an additional fused jumper wire between DLC1 terminals Tc and E1, leaving terminals Ts and E1 connected.
If a DTC is stored, 4 seconds will elapse, then ABS warning light will begin to flash a 2-digit DTC. First group of flashes indicate first digit in DTC. After a 1.5-second pause, second group of flashes indicate second digit in a DTC.
If 2 or more DTCs are stored, there will be a 2.5-second pause between each DTC. After all DTCs are flashed, there will be a 4-second pause, then all DTCs will repeat.
Record DTCs. Turn ignition off. Repair as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . See FRONT SPEED SENSORS , REAR SPEED SENSORS and SENSOR ROTORS under COMPONENT TESTS. Clear DTCs. See CLEARING DTCS .