Jeep Liberty KJ. Manual — part 836
C1044–RIGHT REAR TONE WHEEL PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on, but not if wheel speed is less than 20 km/h (12 m.p.h.).
Or, with low supply voltage.
•
Set Condition:
If the Anti-Lock Brakes Module detects a periodic loss of WSS signal.
Possible Causes
RIGHT REAR TONE WHEEL
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
Turn the ignition on.
With the scan tool, read and record ABS DTCs.
With the scan tool, read and record Environmental Data (EV Data).
With the scan tool, erase DTCs.
Cycle the ignition switch.
WARNING: Ensure brake capability is available before road testing.
Test drive the vehicle. Slowly accelerate as straight as possible from a stop to 40 km/h (25 m.p.h.).
With the scan tool, read ABS DTCs.
Does the scan tool display: C1044–RIGHT REAR TONE WHEEL PERFORMANCE?
Yes
>> Go To 2
No
>> Perform the ABS Intermittent Condition diagnostic procedure in this Section.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
2.
INSPECT RIGHT REAR TONE WHEEL
Inspect the tone wheel teeth for missing teeth, cracks, and looseness. The teeth must be perfectly square, not bent,
or nicked.
Were any problems found?
Yes
>> Replace the Right Rear Tone Wheel in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Test Complete.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
C1046–LEFT FRONT WHEEL PRESSURE PHASE MONITORING
For a complete wiring diagram Refer to Section 8W.
KJ
BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 105
•
When Monitored:
During active ABS control.
•
Set Condition:
If the Anti-Lock Brakes Module detects a pressure reduction phase and the following pressure hold phase is
too long.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
(B9) LEFT FRONT WSS 12 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE, SHORTED TO GROUND, OR
OPEN
(B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, SHORTED TO GROUND, OR OPEN
(B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORTED TO (B9) LEFT FRONT WSS 12 VOLT SUPPLY CIRCUIT
LEFT FRONT TONE WHEEL DAMAGED
LEFT FRONT WSS
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
COMPARE WHEEL SPEED SENSOR SIGNALS
WARNING: Ensure brake capability is available before road testing.
With the scan tool, monitor ALL the WSS speeds while an assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 40 km/h (25 m.p.h.).
Does the LF WSS speed differ from the other WSS speeds by 8 Km/h (5 m.p.h.) or show NO speed?
Yes
>> Go To 2
No
>> Perform the ABS Intermittent Condition diagnostic procedure in this Section.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
2.
INSPECT TERMINALS, CONNECTORS, WIRING HARNESS, & TONE WHEEL
Turn the ignition off.
Visually inspect the Anti-Lock Brakes Module harness connector, Left Front WSS connector, Left Front WSS har-
ness connector, and Left Front WSS tone wheel for damage.
•
Check all related wiring for pinched, chafed, pierced, and partially broken wires.
•
Check all related connectors for broken, bent, pushed out, and corroded terminals.
•
Check the tone wheel teeth for missing teeth, cracks, and looseness. The teeth must be perfectly square, not
bent, or nicked.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 3
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
3.
CHECK (B9) LEFT FRONT WSS 12 VOLT SUPPLY CIRCUIT VOLTAGE
If not done so previously, reconnect the Anti-Lock Brakes Module har-
ness connector.
Disconnect the Left Front WSS harness connector.
Turn the ignition on.
Measure the voltage of the (B9) Left Front WSS 12 Volt Supply circuit.
Is the voltage above 10.0 volts?
Yes
>> Go To 6
No
>> Go To 4
4.
CHECK (B9) LEFT FRONT WSS 12 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12 volts, probe the (B9) Left
Front WSS 12 Volt Supply circuit.
Does the test light illuminate?
Yes
>> Repair the (B9) Left Front WSS 12 Volt Supply circuit for a
short to ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 5
5.
CHECK (B9) LEFT FRONT WSS 12 VOLT SUPPLY CIRCUIT FOR AN OPEN
Connect a jumper wire between ground and the (B9) Left Front WSS 12
Volt Supply circuit in the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12 volts, probe the (B9) Left
Front WSS 12 Volt Supply circuit.
Does the test light illuminate brightly?
Yes
>> Go To 6
No
>> Repair the (B9) Left Front WSS 12 Volt Supply circuit for an
open.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
KJ
BRAKES - ABS ELECTRICAL DIAGNOSTICS
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