Jeep Grand Cherokee WK. Manual — part 128
C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
3.
(B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORTED TO THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Left Front WSS harness connector.
Measure the resistance between the (B8) Left Front WSS Signal and
the (B9) Left Front WSS Supply circuits at the Left Front WSS harness
connector.
Is the resistance above 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the (B8) Left Front WSS Signal circuit for a short to
the (B9) Left Front WSS Supply circuit.
Perform ABS VERIFICATION TEST - VER 1.
4.
CHECK THE VOLTAGE ON THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT
Turn the ignition off.
Connect the Anti-Lock Brake Module harness connector.
Turn the ignition on.
Measure the voltage of the (B9) Left Front WSS Supply circuit in the
Left Front WSS harness connector.
Is the voltage above 10 volts?
Yes
>> Go To 8
No
>> Go To 5
5.
(B9) LEFT FRONT 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 (B9) Left Front WSS Supply circuit.
Is there any voltage present?
Yes
>> Repair the (B9) Left Front WSS Supply circuit for a short
to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 6
5 - 138
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
6.
(B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (B9) Left Front WSS
Supply circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B9) Left Front WSS Supply circuit for a short
to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 7
7.
(B9) LEFT FRONT WSS SUPPLY CIRCUIT OPEN
Measure the resistance of the (B9) Left Front WSS Supply circuit.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Anti-Lock Brake Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Repair the (B9) Left Front WSS Supply circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 139
C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
8.
CHECK THE (B9) LEFT FRONT WSS SUPPLY AND THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE
Measure the voltage between the (B9) Left Front WSS Supply and
(B8) Left Front WSS Signal circuits at the Left Front WSS harness
connector.
Is the voltage above 10 volts?
Yes
>> Go To 11
No
>> Go To 9
9.
(B8) LEFT FRONT WSS SIGNAL 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 (B8) Left Front WSS Signal circuit.
Is there any voltage present?
Yes
>> Repair the (B8) Left Front WSS Signal circuit for a short to
voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 10
10.
(B8) LEFT FRONT WSS SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (B8) Left Front WSS Signal circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (B8) Left Front WSS Signal circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Replace the Anti-Lock Brake Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT (CONTINUED)
11.
CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (B8) Left Front WSS
Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B8) Left Front WSS Signal circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 12
12.
CHECK THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE AT THE LEFT FRONT WSS HARNESS
CONNECTOR
Turn the ignition off.
Reconnect all connectors.
Turn the ignition on.
While back probing, measure the voltage between the (B8) Left Front
WSS Signal circuit at the Left Front WSS harness connector and
ground.
Slowly rotate the wheel by hand.
Does the (B8) Left Front WSS Signal circuit voltage toggle
between approximately 1.6 and .8 volts?
Yes
>> Go To 13
No
>> Replace the Left Front WSS in accordance with the Ser-
vice Information.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 141
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