Possible Causes

Circuit open
Circuit shorted
Wheel speed sensor
ABS module

CAUTION:

Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

DTCS C1145, C1155 AND C1230 - WHEEL SPEED SENSOR CIRCUIT FAILURE - PINPOINT TEST REFERENCE

PINPOINT TEST 3		DTCS C1145, C1155 AND C1230 - WHEEL SPEED SENSOR CIRCUIT FAILURE
STEP	INSPECTION		ACTION
1	CHECK THE WHEEL SPEED SENSOR CIRCUIT(S) FOR A SHORT TO VOLTAGE Key OFF. Disconnect: ABS module connector. Disconnect: Suspect wheel speed sensor connector(s). For DTC C1145, measure the voltage between ground and: ABS module circuit (V/W), harness side. ABS module circuit (Y), harness side. For DTC C1155, measure the voltage between ground and: ABS module circuit (GY/V), harness side. ABS module circuit (V), harness side. For DTC C1230, measure the voltage between ground and: ABS module circuit (W/BR), harness side. ABS module circuit (BR/G), harness side. Is voltage present?	Yes	Repair the affected circuits) for a short to voltage. Clear the DTCs. Repeat the self-test with the brake pedal not applied.
1		No	Go to next step.
2	CHECK THE WHEEL SPEED SENSOR CIRCUIT(S) FOR A SHORT TO GROUND For DTC C1145, measure the resistance between ground and: ABS module circuit (V/W), harness side. ABS module circuit (Y), harness side. For DTC C1155, measure the resistance between ground and: ABS module circuit (GY/V), harness side. ABS module circuit (V), harness side. For DTC C1230, measure the resistance between ground and: ABS module circuit (W/BR), harness side. ABS module circuit (BR/G), harness side. Are the resistances greater than 10,000 ohms?	Yes	Go to next step.
2		No	Repair the affected circuits) for a short to ground. Clear the DTCs. Repeat the self-test with the brake pedal not applied.
3	CHECK THE WHEEL SPEED SENSOR CIRCUIT(S) FOR AN OPEN For DTC C1145, measure the resistance between ground and: ABS module circuit (V/W), harness side and LF wheel speed sensor circuit (V/W), harness side. ABS module circuit (Y), harness side and LF wheel speed sensor circuit (Y), harness side. For DTC C1155, measure the resistance between ground and: ABS module circuit (GY/V), harness side and RF wheel speed sensor circuit (GY/V), harness side. ABS module circuit (V), harness side and RF wheel speed sensor circuit (V), harness side. For DTC C1230, measure the resistance between ground and: ABS module circuit (W/BR), harness side and rear wheel speed sensor circuit (W/BR), harness side. ABS module circuit (BR/G), harness side and rear wheel speed sensor circuit (BR/G), harness side. Are the resistances less than 5 ohms?	Yes	Go to next step.
3		No	Repair the affected circuits) for an open. Clear the DTCs. Repeat the self-test with the brake pedal not applied.
4	CHECK WHEEL SPEED SENSOR RESISTANCE For DTC C1145, measure the resistance between RF wheel speed sensor circuits component side. For DTC C1155, measure the resistance between LF wheel speed sensor circuits component side. For DTC C1230, measure the resistance between rear wheel speed sensor circuits component side. Is the resistance between 800 and 1400 ohms (front 2WD), 380 and 480 ohms (front 4WD) or 800 and 2500 ohms (rear all)?	Yes	Go to next step.
4		No	Install a new wheel speed sensor. For the front wheel speed sensor (4WD), see WHEEL SPEED SENSOR - FRONT, 4WD . Clear the DTCs. Repeat the self-test with the brake pedal not applied. For the front wheel speed sensor (2WD), see WHEEL SPEED SENSOR - FRONT, 2WD . Clear the DTCs. Repeat the self-test with the brake pedal not applied. For the rear wheel speed sensor, see WHEEL SPEED SENSOR - REAR . Cear the DTCs. Repeat the self-test with the brake pedal not applied.
5	CHECK WHEEL SPEED SENSOR HARNESS FOR DAMAGE Inspect the wheel speed sensor harness at the affected wheel end for chafing or other wiring damage. Is damage found?	Yes	Install a new wheel speed sensor. For the front wheel speed sensor (4WD), see WHEEL SPEED SENSOR - FRONT, 4WD . Use IDS or equivalent tester to clear the DTCs. Repeat the self-test with the brake pedal not applied. For the front wheel speed sensor (2WD), see WHEEL SPEED SENSOR - FRONT, 2WD . Clear the DTCs. Repeat the self-test with the brake pedal not applied. For the rear wheel speed sensor, see WHEEL SPEED SENSOR - REAR . Clear the DTCs. Repeat the self-test with the brake pedal not applied.
5		No	Go to next step.
6	CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all ABS connectors. Check for: corrosion. pushed-out pins. spread terminals. Connect all ABS connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	Install a new ABS module. see ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . Test the system for normal operation.
6		No	The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. Clear the DTCs. Repeat the self-test with the brake pedal not applied.