Sensor Failure

SENSOR FAILURE
A. Connect EEC IV 60-Pin Breakout Box to the EHCU with the ABS adapter cable.
B. Disconnect the suspect anti-lock brake sensor.
C. Check the harness for short to ground.
1. Monitor the resistance between 60 pin breakout box pins and ground:

NOTE: Use the 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

2. Drive over rough roads at various speeds.
3. If there is continuity between either circuit and ground, repair the circuit for a short to ground.

D. Check harness for open circuit.
1. Connect a jumper between the two pins on the suspect sensor connector.

NOTE: Connect jumper securely to the suspect sensor connector.

2. Monitor the resistance between breakout box pins:

NOTE: Use the 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.

3. Drive over rough roads at various speeds.
4. If there is open circuit detected between pins, repair the circuit(s) for a open circuit.

E. Check suspect sensor pigtail.
1. Monitor the resistance between suspect sensor terminals while wiggling the pigtail:

NOTE: Use the 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.

2. Monitor the resistance between suspect sensor terminals while wiggling the pigtail:

NOTE: Use the 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

3. If the resistance does not remain within specifications, replace the sensor.
4. Monitor the resistance between a sensor terminal and ground on the highest resistance scale of the meter, while wiggling the pigtail.

NOTE: Use the 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.

5. If the meter shows anything but open circuit, replace the sensor.