Jeep Liberty KJ. Manual — part 840
C1049–RIGHT REAR WHEEL PRESSURE PHASE MONITORING
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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•
When Monitored:
During active ABS control.
•
Set Condition:
When 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
(B2) RIGHT REAR WSS 12 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE, SHORTED TO GROUND, OR
OPEN
(B1) RIGHT REAR WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, SHORTED TO GROUND, OR OPEN
(B1) RIGHT REAR WSS SIGNAL CIRCUIT SHORTED TO (B2) RIGHT REAR WSS 12 VOLT SUPPLY CIRCUIT
RIGHT REAR TONE WHEEL DAMAGED
RIGHT REAR 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 RR WSS speed 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 Brake Module harness connector, Right Rear WSS connector, Right Rear WSS har-
ness connector, and Right Rear 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
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3.
CHECK (B2) RIGHT REAR WSS 12 VOLT SUPPLY CIRCUIT VOLTAGE
If not done so previously, reconnect the Anti-Lock Brakes Module har-
ness connector.
Disconnect the Right Rear WSS harness connector.
Turn the ignition on.
Measure the voltage of the (B2) Right Rear WSS 12 Volt Supply circuit.
Is the voltage above 10.0 volts?
Yes
>> Go To 6
No
>> Go To 4
4.
CHECK (B2) RIGHT REAR 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 (B2) Right
Rear WSS 12 Volt Supply circuit.
Does the test light illuminate?
Yes
>> Repair the (B2) Right Rear 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 (B2) RIGHT REAR WSS 12 VOLT SUPPLY CIRCUIT FOR AN OPEN
Connect a jumper wire between ground and the (B2) Right Rear WSS
12 Volt Supply circuit in the Anti-Lock Brakes Module harness connec-
tor.
Using a 12-volt test light connected to 12 volts, probe the (B2) Right
Rear WSS 12 Volt Supply circuit.
Does the test light illuminate brightly?
Yes
>> Go To 6
No
>> Repair the (B2) Right Rear WSS 12 Volt Supply circuit for
an open.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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6.
CHECK (B1) RIGHT REAR WSS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
If not done so previously, turn the ignition on.
Measure the voltage of the (B1) Right Rear WSS Signal circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the (B1) Right Rear WSS Signal circuit for a short to
voltage.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 7
7.
CHECK (B1) RIGHT REAR WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
If not done so previously, disconnect the Anti-Lock Brakes Module har-
ness connector.
Using a 12-volt test light connected to 12 volts, probe the (B1) Right
Rear WSS Signal circuit.
Does the test light illuminate?
Yes
>> Repair the (B1) Right Rear WSS Signal circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 8
8.
CHECK (B1) RIGHT REAR WSS SIGNAL CIRCUIT FOR AN OPEN
Connect a jumper wire between ground and the (B1) Right Rear WSS
Signal circuit in the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12 volts, probe the (B1) Right
Rear WSS Signal circuit.
Does the test light illuminate brightly?
Yes
>> Go To 9
No
>> Repair the (B1) Right Rear WSS Signal circuit for an open.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
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