Component Tests and General Diagnostics
Component Test - Intermittent Failures
Power/Ground to Anti-Lock Brake System (ABS)Module
If the fuse has failed:
A. Check the weather packing of the power connector to the ABS module C135.
B. Remove power distribution box fuse F (60A).
C. Measure the resistance between the outside pin of power distribution box fuse F (60A), circuit 532 (OG/YE), and ground.
D. Spray with water and wiggle the wiring between the power distribution box and the ABS module.
E. If any continuity is measured, repair or install new wiring.
Check for opens in wiring:
A. Disconnect the ABS module C135.
B. While measuring the voltage between ABS module C135 pins 9 and 25, circuit 532 (OG/YE), and negative battery post, wiggle the wiring harness.
C. If the voltage momentary drops below 10 volts while the harness is wiggled, repair or install new wiring.
D. While measuring the resistance between the ABS module C135 pins 8 and 24, circuit 530 (LG/RD), and ground, wiggle the wiring harness.
E. If the resistance momentarily goes above 5 ohms, while the harness is wiggled, repair or install new wiring.
Yellow ABS Warning Indicator Failure
Does not illuminate (prove-out):
A. Connect EEC-IV 60-Pin Breakout Box to the ABS module with the ABS Adapter Cable.
B. Connect EEC-IV 60-Pin Breakout Box pin 1 (yellow indicator) to the B+ pin.
C. Wiggle the wire harness at the several points between the ABS module and the instrument cluster.
D. Repair or install a new wire harness at the location that the indicator flickered off for an open circuit.
Does illuminate (prove-out):
A. Wiggle the wire harness at the several points between the ABS module and the instrument cluster.
B. Repair or install a new wire harness at the location that the indicator flickered on for a short to ground.
Sensor Failure
1. Connect EEC-IV 60-Pin Breakout Box to the ABS module with the ABS Adapter Cable.
2. Disconnect the suspect wheel speed sensor.
3. Check the harness for short to ground.
1 NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
Monitor the resistance between EEC-IV 60-Pin Breakout Box pins and ground as shown.
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.
4. Check harness for open circuit.
1 NOTE: Connect jumper securely to the suspect sensor connector.
Connect a jumper between the two pins on the suspect sensor connector.
2 NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
Monitor the resistance between EEC-IV 60-Pin Breakout Box pins as shown.
3 Drive over rough roads at various speeds.
4 If there is an open circuit detected between pins, repair the circuit(s) for an open circuit.
5. Check suspect sensor electrical connector.
Maximum Resistance:
1 NOTE:Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
Monitor the resistance between suspect wheel speed sensor terminals while wiggling the electrical connector:
2 If the resistance is above specifications, install a new wheel speed sensor.
Minimum Resistance:
3 NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
Monitor the resistance between suspect wheel speed sensor terminals while wiggling the electrical connector:
4 If the resistance is below specifications, install a new wheel speed sensor.
5 NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
Monitor the resistance between an wheel speed sensor terminal and ground on the highest resistance scale of the meter while wiggling the electrical connector.
6 If the meter shows anything other than open circuit, install a new wheel speed sensor.