Speed Sensor Diagnostics
NOTE:
While diagnosing speed sensors, brake system functions as a conventional system.
- Ensure battery is in good condition and is fully charged. Turn ignition on. ABS light should illuminate, then go out after about 3 seconds. If ABS light does not illuminate, check fuse, bulb, and wiring harness.
- Turn ignition off. Connect jumper wire between terminals Ts and E1 of DLC1. See Figure. Set parking brake. Start engine. ABS light should flash 4 times per second.
- Shift transfer case to L4 position. Engage center differential lock switch to ON position. Drive vehicle straight ahead above 28 MPH for several seconds. ABS light should go off.
- Stop vehicle. Connect jumper wire between terminals Tc and E1 of DLC1, leaving terminals Ts and E1 connected. If a DTC is stored, 4 seconds will elapse, then ABS light will begin to flash a 2-digit DTC. First group of flashes will indicate first digit in DTC. After a 1.5-second pause, second group of flashes will indicate second digit in a DTC.
- If 2 or more DTC are stored, there will be a 2.5-second pause between each DTC. After all DTC are flashed, there will be a 4-second pause, then all DTC will repeat.
- Record DTC. Turn ignition off. Repair as necessary. See SPEED SENSOR DTC . Remove jumper wire from DLC1. Clear DTC. See CLEARING DTC .
SPEED SENSOR DTC
| DTC | Possible Cause |
|---|---|
| 71 | Right Front Speed Sensor Signal Low Voltage |
| 72 | Left Front Speed Sensor Signal Low Voltage |
| 73 | Right Rear Speed Sensor Signal Low Voltage |
| 74 | Low Voltage Of Left Rear Speed Sensor Signal |
| 75 | Right Front Speed Sensor Abnormal Signal |
| 76 | Left Front Speed Sensor Abnormal Signal |
| 77 | Right Rear Speed Sensor Abnormal Signal |
| 78 | Left Rear Speed Sensor Abnormal Signal |
| 79 | Faulty Deceleration Sensor |
| 82 | Center Differential Lock Position Switch Malfunction |
| 83 | L4 Position Switch Malfunction |