C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT
For a complete wiring diagram Refer to Section 8W.
Possible Causes
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WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
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(B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
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(B3) LEFT REAR WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
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(B3) LEFT REAR WSS SIGNAL CIRCUIT SHORTED TO (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT
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LEFT REAR WSS
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ANTI-LOCK BRAKES MODULE
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Diagnostic Test
1.
CHECK FOR DTC C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT
NOTE:
This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition switch from off to on.
With the scan tool, read DTCs.
Does the scan tool display: C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT?
Yes
No
-
The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced,
pinched, or partially broken wires.
-
Refer to the ABS-INTERMITTENT CONDITION TEST.
(Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)
2.
CHECK CONNECTOR/TERMINAL FOR DAMAGE
NOTE:
Check all terminals for broken, bent, pushed out, or corroded terminals.
Turn the ignition off.
Inspect the Anti-Lock Brake Module harness connector, Left Rear WSS, and Left Rear WSS harness connector.
Is the Left Rear WSS or any of the connectors/terminals damaged?
Yes
No
3.
CHECK (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT VOLTAGE
Disconnect the Left Rear WSS harness connector.
Turn the ignition on.
Measure the voltage of the (B4) Left Rear WSS 12 Volt Supply circuit.
Is the voltage above 10.0 volts?
Yes
No
4.
CHECK (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Left Rear WSS harness connector.
Disconnect the Anti-Lock Brake Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B4) Left Rear WSS Supply circuit.
Does the test light illuminate brightly?
Yes
No
5.
CHECK (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT FOR AN OPEN
Connect a jumper wire between ground and the (B4) Left Rear WSS Supply circuit in the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B4) Left Rear WSS Supply circuit.
Does the test light illuminate brightly?
Yes
No
6.
CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND
Using a 12-volt test light connected to 12-volts, probe the (B3) Left Rear WSS Signal circuit.
Does the test light illuminate brightly?
Yes
No
7.
CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT FOR AN OPEN
Connect a jumper wire between ground and the (B3) Left Rear WSS Signal circuit in the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B3) Left Rear WSS Signal circuit.
Does the test light illuminate brightly?
Yes
No
8.
CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition on.
Remove all jumper wires.
Measure the voltage between the (B3) Left Rear WSS Signal circuit and ground.
Is the voltage above one volt?
Yes
No
9.
CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT AND (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT SHORTED TOGETHER
Turn the ignition off.
Measure the resistance between the (B3) Left Rear WSS Signal circuit and the (B4) Left Rear WSS Supply circuit.
Is the resistance above 120 ohms?
Yes
Go To 10
No
10.
LEFT REAR WHEEL SPEED SENSOR
Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information.
Perform ABS VERIFICATION TEST.
(Refer to 5 - BRAKES - STANDARD PROCEDURE).
CAUTION:
Ensure brake capability is available before road testing.
Road test the vehicle over 40 km/h (25 mph).
NOTE:
Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.
With the scan tool, read ABS DTCs.
Did DTC C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT reset?
Yes
No