Dodge Durango (HB). Manual — part 91
C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT
HB
BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 143
C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
When the Left Rear Wheel Speed Sensor circuit fails the diagnostic test.
Possible Causes
CONNECTOR/TERMINAL DAMAGE
(B4) LEFT REAR WSS SUPPLY CIRCUIT SHORTED TO GROUND OR OPEN
(B3) LEFT REAR WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(B3) LEFT REAR WSS SIGNAL CIRCUIT AND (B4) LEFT REAR WSS SUPPLY CIRCUIT SHORTED TOGETHER
LEFT REAR WSS - INTERNAL FAULT
ANTI-LOCK BRAKE MODULE - INTERNAL FAULT
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 DTC’s.
Cycle the ignition switch from off to on.
With the scan tool, read DTC’s
Does the scan tool display: C1020–LEFT REAR WHEEL SPEED
SENSOR CIRCUIT?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic pro-
cedure.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
HB
C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
2.
CHECK CONNECTOR/TERMINAL FOR DAMAGE
NOTE: Check all terminals for broken, bent, pushed out, or cor-
roded 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 dam-
aged?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
CHECK (B4) LEFT FRONT WSS SUPPLY CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Left Rear WSS harness connector.
Turn the ignition on.
Measure the voltage between the (B4) Left Rear WSS Supply circuit
and ground.
Is the voltage above 10 volts?
Yes
>> Go To 6
No
>> Go To 4
HB
BRAKES - ABS ELECTRICAL DIAGNOSTICS
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C1020–LEFT REAR WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
4.
CHECK (B4) LEFT REAR WSS SUPPLY CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Left Rear WSS 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
>> Repair the (B4) Left Rear WSS Supply circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
CHECK (B4) LEFT REAR WSS SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Left Rear WSS harness connector.
Connect a jumper wire between the (B4) Left Rear WSS Supply circuit
and ground.
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
>> Go To 6
No
>> Repair the (B4) Left Rear WSS Supply circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6.
CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Left Rear WSS harness connector.
Turn the ignition on.
Measure the voltage between the (B3) Left Rear WSS Signal circuit
and ground.
Is the voltage above one volt?
Yes
>> Repair the (B3) Left Rear WSS Signal circuit for a short to
voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 7
5 - 146
BRAKES - ABS ELECTRICAL DIAGNOSTICS
HB
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