Jeep Liberty KJ. Manual — part 848
C1234–DRIVE TEST: SENSOR CLUSTER INSTALLATION
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
During the Drive Test.
•
Set Condition:
If the Anti-Lock Brakes Module detects implausible Dynamics Sensor data.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
DYNAMICS SENSOR INSTALLATION
DYNAMICS SENSOR
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
CHECK THE DYNAMICS SENSOR INSTALLATION
NOTE: Dynamics Sensor installation and mounting bolt torque is crucial for proper operation.
Turn the ignition off.
Check the Dynamics Sensor for damaged, modified, and bent mounting brackets.
Check the Dynamics Sensor mounting bolts for a loose or over tightened condition.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 2
2.
INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS
Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded terminals.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 3
3.
REPLACE DYNAMICS SENSOR & VERIFY IF DTC IS STILL ACTIVE
Replace the Dynamics Sensor in accordance with the Service Information.
Turn the ignition on.
With the scan tool, erase ABS DTCs.
Cycle the ignition switch.
WARNING: Ensure brake capability is available before road testing.
NOTE: The ECU Initialization process must include driving the vehicle into a 90° turn.
Using the scan tool, perform ECU Initialization (which includes Drive Test). Follow directions on the scan tool.
Park the vehicle.
With the scan tool, read ABS DTCs.
Does this DTC reset?
Yes
>> Replace the Anti-Lock Brakes Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
KJ
BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 153
C1238-DRIVE TEST: UNSUCCESSFUL
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
During the Drive Test.
•
Set Condition:
If the Anti-Lock Brakes Module detects a fault with the Steering Angle Sensor, the Pressure Sensor, or the
Dynamics Sensor.
Possible Causes
STEERING ANGLE SENSOR
PRESSURE SENSOR
DYNAMICS SENSOR
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
DIAGNOSE & REPAIR ALL DTCs
Repair
Diagnose and repair all DTCs.
C1239–EMISSIONS ROLLS TEST ACTIVE
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
This DTC sets when the Emissions Rolls Test is active. The functional effects are that the output signal for all wheel
speeds mimic the wheel with the highest wheel speed.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
C123A–ESP SYSTEM SENSORS CALIBRATION
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Once per ignition cycle.
•
Set Condition:
If the calculated checksum does not match the stored checksum.
Possible Causes
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
REPLACE THE ANTI-LOCK BRAKES MODULE
Repair
Replace the Anti-Lock Brakes Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
KJ
BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 155
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