Sensor Failure
- Connect Breakout Box with adapter to ABCM. Disconnect suspect ABS sensor. Check sensor harness for short-to-ground using 88 digital multimeter with HOLD feature on. Check resistance between Breakout Box pins for suspect ABS sensor. See ABS SENSOR PIN CHART . Drive over rough roads. If there is continuity between either circuit and ground, repair circuit for short-to-ground.
- To check for open circuit, connect jumper to suspect ABS sensor connector terminals. Attach 88 digital multimeter with Minimum Resistance Hold feature on. Drive over rough roads. Repeat test drive with Maximum Resistance Hold feature on. If an open circuit is detected between suspect ABS sensor pins, repair open in that wire circuit.
- Using an 88 digital multimeter with Maximum Resistance Hold feature on, monitor resistance between suspect ABS sensor terminals while wiggling connector. If testing front ABS sensor, resistance should be 4000 ohms. For rear ABS sensor, resistance should be 1500 ohms. If resistance is more than specified, replace suspect ABS sensor.
- Using an 88 digital multimeter with Minimum Resistance Hold feature on, monitor resistance between suspect ABS sensor terminals while wiggling connector. If testing front ABS sensor, resistance should be 2000 ohms. For rear ABS sensor, resistance should be 900 ohms. If resistance is more than specified, replace suspect ABS sensor.
ABS SENSOR PIN CHART
| Sensor | Breakout Box Pins No. (Wire Colors) |
|---|---|
| LF | 11 (Tan/Orn) & 23 (Tan/Blk) |
| RF | 10 (Yel/Red) & 22 (Yel/Blk) |
| Rear | 9 (Red/Pnk) & 21 (LtGrn/Blk) |