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Speed Sensor Diagnostics

NOTE: While diagnosing speed sensors, brake system functions as a conventional system.
  1. Ensure battery is fully charged. Turn ignition on. Ensure ABS warning light illuminates, then turns off after about 3 seconds. If ABS warning light does not illuminate, check fuse, bulb and wiring harness. See ABS WARNING LIGHT CIRCUIT  under CIRCUIT TESTS.
  2. Turn ignition off. DO NOT remove short pin from DLC1. Using a fused jumper wire, jumper terminals Ts and E1 of DLC1. DLC1 is located in left side of engine compartment. See Figure. Apply parking brake. Start engine. Ensure ABS warning light flashes 4 times per second. If ABS warning light does not flash, go to ABS WARNING LIGHT CIRCUIT  under CIRCUIT TESTS. If ABS warning light flashes, go to next step.
  3. Drive vehicle at speeds greater than 28 MPH for several seconds. Stop vehicle. Jumper terminals Tc and E1 of DLC1. See Figure. If all sensors are okay, a normal DTC is displayed (ABS warning light flashes 2 times per second). If a malfunction is detected, 4 seconds will elapse and ABS warning light will begin to flash a 2-digit DTC. First number of flashes equal first digit in DTC. After a 1.5-second pause, second number of flashes equal second digit in DTC.
  4. 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 and all DTCs will repeat.
  5. Record DTCs. Turn ignition off. Repair as necessary. See SPEED SENSOR DTC IDENTIFICATION . Remove jumper wires from DLC1. Clear DTCs. See CLEARING DTCS .
SPEED SENSOR DTC IDENTIFICATION

DTC (1) Description (2) Suspect Area
71 Low Output Voltage (RF Speed Sensor) Sensor/Sensor Rotor Installation
72 Low Output Voltage (LF Speed Sensor) Sensor/Sensor Rotor Installation
73 Low Output Voltage (RR Speed Sensor) RR Axle Hub
74 Low Output Voltage (LR Speed Sensor) LR Axle Hub
75 Abnormal Change In Output Voltage (RF Speed Sensor) RF Sensor Rotor
76 Abnormal Change In Output Voltage (LF Speed Sensor) LF Sensor Rotor
77 Abnormal Change In Output Voltage (RR Speed Sensor) RR Axle Hub
78 Abnormal Change In Output Voltage (LR Speed Sensor) LR Axle Hub
79 Faulty Deceleration Sensor (4WD) Deceleration Sensor
(1) Code displayed by ABS warning light.
(2) Inspect and repair as necessary.
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