Jeep Liberty KJ. Manual — part 1113
U0125–LOST COMMUNICATION WITH DYNAMICS SENSOR
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Anti-Lock Brakes Module fails to receive bus messages from the Dynamics Sensor.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
(D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT SHORTED TO GROUND, SHORTED TO VOLTAGE, OR
OPEN
(D51) DYNAMICS SENSOR LOW DATA LINK CIRCUIT SHORTED TO GROUND, SHORTED TO VOLTAGE, OR
OPEN
DYNAMICS SENSOR INSTALLATION
DYNAMICS SENSOR
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: If present, diagnose and repair DTC C2114–DYNAMICS SENSOR SUPPLY VOLTAGE LOW or DTC
C2115–DYNAMICS SENSOR SUPPLY VOLTAGE HIGH before proceeding.
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.
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.
CHECK THE (D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE
Disconnect the Anti-Lock Brakes Module harness connector.
Disconnect the Dynamics Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (D52) Dynamics Sensor High Data Link cir-
cuit.
Is there any voltage present?
Yes
>> Repair the (D52) Dynamics Sensor High Data Link circuit
for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 5
5.
CHECK THE (D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (D52) Dynamics Sensor High Data Link
circuit between ground and the Dynamics Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (D52) Dynamics Sensor High Data Link circuit
for a short to ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 6
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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6.
CHECK THE (D52) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR AN OPEN
Measure the resistance of the (D52) Dynamics Sensor High Data Link
circuit between the Dynamics Sensor harness connector and the Anti-
Lock Brakes Module harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the (D52) Dynamics Sensor High Data Link circuit
for an open.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
7.
CHECK THE (D51) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (D51) Dynamics Sensor Low Data Link cir-
cuit.
Is there any voltage present?
Yes
>> Repair the (D51) Dynamics Sensor Low Data Link circuit for
a short to voltage.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 8
8.
CHECK THE (D51) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (D51) Dynamics Sensor Low Data Link
circuit between ground and the Dynamics Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (D51) Dynamics Sensor Low Data Link circuit for
a short to ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 9
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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