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 CIRCUIT TESTS.
Turn ignition off. Connect a fused jumper wire between DLC1 terminals Ts and E₁ . See Figure. Apply parking brake. Start engine. 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 DTC DEFINITIONS . See FRONT SPEED SENSORS , REAR SPEED SENSORS and SENSOR ROTORS under COMPONENT TESTS. Clear DTCs. See CLEARING DTCS .