Jeep Grand Cherokee WK. Manual — part 138
C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE (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 Signal circuit indicates continuously too high or too low wheel speed.
Possible Causes
TERMINAL/CONNECTOR/TONE WHEEL DAMAGE
(B3) LEFT REAR WSS SIGNAL CIRCUIT SHORTED TO THE (B4) LEFT REAR WSS SUPPLY CIRCUIT
(B4) LEFT REAR WSS SUPPLY CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(B3) LEFT REAR WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
LEFT REAR WHEEL SPEED SENSOR
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK FOR A DTC C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE
NOTE: This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, read DTCs.
Record DTC and Freeze Frame information.
With the scan tool, erase DTCs.
CAUTION: Ensure braking capability is available before road testing.
Drive the vehicle over 25 Km/h (15 mph).
Park the vehicle and cycle the ignition switch from off to on.
With the scan tool, read DTCs.
Does the scan tool display: C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFOR-
MANCE?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE (CONTINUED)
2.
CHECK THE TERMINALS/CONNECTORS/TONE WHEEL FOR DAMAGE
NOTE: Check all related wiring for bruised, chafed, pierced, or partially broken wires.
NOTE: Check all related connectors for broken, bent, pushed out, or corroded terminals.
NOTE: Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly
square, not bent, or nicked.
Turn the ignition off.
Inspect the Anti-Lock Brake Module harness connector, Left Rear WSS, Left Rear WSS harness connector, and Left
Rear WSS tone wheel (if applicable).
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
(B3) LEFT REAR WSS SIGNAL CIRCUIT SHORTED TO THE (B4) LEFT REAR WSS SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Left Rear WSS harness connector.
Measure the resistance between the (B3) Left Rear WSS Signal and
the (B4) Left Rear WSS Supply circuits at the Left Rear WSS harness
connector.
Is the resistance above 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the (B3) Left Rear WSS Signal circuit for a short to
the (B4) Left Rear WSS Supply circuit.
Perform ABS VERIFICATION TEST - VER 1.
4.
CHECK THE VOLTAGE ON THE (B4) LEFT REAR WSS SUPPLY CIRCUIT
Turn the ignition off.
Connect the Anti-Lock Brake Module harness connector.
Turn the ignition on.
Measure the voltage of the (B4) Left Rear WSS Supply circuit in the
Left Rear WSS harness connector.
Is the voltage above 10 volts?
Yes
>> Go To 8
No
>> Go To 5
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE (CONTINUED)
5.
(B4) LEFT REAR WSS SUPPLY CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Turn the ignition on.
Measure the voltage of the (B4) Left Rear WSS Supply circuit.
Is there any voltage present?
Yes
>> Repair the (B4) Left Rear WSS Supply circuit for a short to
voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 6
6.
(B4) LEFT REAR WSS SUPPLY CIRCUIT SHORT TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (B4) Left Rear WSS
Supply circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B4) Left Rear WSS Supply circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 7
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