Jeep Liberty KJ. Manual — part 1103
C1242–GSENSOR INPUT SIGNAL PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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•
When Monitored:
Continuously, with ignition on, until vehicle speed exceeds 20 km/h (12.4 m.p.h.) for the first time, but not if the
sensor voltage is out of range,
Or, during diagnostic mode.
Or, if the monitoring was inhibited by a corresponding diagnostics command.
Or, if the vehicle speed has exceeded 20 km/h (12.4 m.p.h.) during the actual ignition cycle.
Or, if at least one over spinning wheel is detected.
Or, if one of the control functions is active.
•
Set Condition:
If the measured acceleration signal is higher than 0.8 g and longer than the specified detection time.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
DYNAMICS SENSOR INSTALLATION
DYNAMICS SENSOR
ANTI-LOCK BRAKES MODULE
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 ABS DTCs.
Cycle the ignition switch.
WARNING: Ensure brake capability is available before road testing.
Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 20 km/hr
(6 and 12 m.p.h.).
Park the vehicle.
With the scan tool, read ABS DTCs.
Does this DTC reset?
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.
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 3
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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3.
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 4
4.
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.
WARNING: Ensure brake capability is available before road testing.
Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 20 km/hr
(6 and 12 m.p.h.).
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).
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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C1243–G SENSOR NOT INITIALIZED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Once after ignition on.
•
Set Condition:
If the stored zero point calibration value of the longitudinal acceleration sensor is invalid.
Possible Causes
DYNAMICS SENSOR NOT CALIBRATED
DYNAMICS SENSOR
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
PERFORM ECU INITIALIZATION
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.
>> Go To 2
2.
VERIFY IF DTC IS STILL ACTIVE
Cycle the ignition switch.
WARNING: Ensure brake capability is available before road testing.
Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 25 km/hr
(6 and 15 m.p.h.).
Park the vehicle.
With the scan tool, read ABS DTCs.
Does this DTC reset?
Yes
>> Go To 3
No
>> Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
3.
REPLACE DYNAMICS SENSOR & VERIFY IF DTC IS STILL ACTIVE
Turn the ignition off.
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.
Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 25 km/hr
(6 and 15 m.p.h.).
Park the vehicle.
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