Jeep Grand Cherokee WK. Manual — part 147
C1044-RIGHT REAR TONE WHEEL 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 Anti-Lock Brake Module detects periodic drops of a WSS signal.
Possible Causes
RIGHT REAR TONE WHEEL
Diagnostic Test
1.
CHECK FOR A DTC C1044-RIGHT REAR TONE WHEEL 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.
Cycle the ignition switch off then on.
CAUTION: Ensure brake capability is available before road testing.
Test drive the vehicle in a straight line to 40 Km/h (25 mph).
With the scan tool, read DTCs.
Does the scan tool display: C1044-RIGHT REAR TONE WHEEL PERFORMANCE?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
2.
CHECK THE RIGHT REAR TONE WHEEL FOR DAMAGE
NOTE: Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly
square, not bent, or nicked.
Check the Right Rear Tone Wheel for damage.
Were any problems found?
Yes
>> Replace the Right Rear Tone Wheel in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Test Complete.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 215
C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING (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 Anti-Lock Brake Module detects a pressure reduction phase and the following pressure hold phase
is too long.
Possible Causes
TERMINAL/CONNECTOR/WIRING HARNESS/TONE WHEEL DAMAGE
(B8) LEFT FRONT WSS SIGNAL CIRCUIT OPEN
LEFT FRONT WHEEL SPEED SENSOR
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK FOR A DTC C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING
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.
Cycle the ignition switch off then on.
CAUTION: Ensure brake capability is available before road testing.
Have an assistant test drive the vehicle in a straight line to 40 Km/h (25 mph) while monitoring all the WSS speeds
with the scan tool.
Did the LF WSS speed differ by 8 Km/h (5 mph) or show NO speed?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
2.
CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS/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.
Visually inspect the Anti-Lock Brake Module harness connector, Left Front WSS, Left Front WSS harness connector,
and Left Front WSS tone wheel (if applicable) for damage.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 3
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING (CONTINUED)
3.
CHECK THE VOLTAGE BETWEEN (B9) LEFT FRONT WSS SUPPLY CIRCUIT AND THE (B8) LEFT FRONT
WSS SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the Left Front WSS harness connector.
Turn the ignition on.
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 4
No
>> Refer to DTC-C100A LEFT FRONT WHEEL SPEED SEN-
SOR CIRCUIT for the diagnostic repair procedure.
Perform ABS VERIFICATION TEST - VER 1.
4.
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
chassis ground.
Slowly rotate the wheel by hand.
Did the (B8) Left Front WSS Signal circuit voltage toggle
between approximately 1.6 to .8 volts?
Yes
>> Go To 5
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 - 217
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