Jeep Liberty KJ. Manual — part 1459
U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS)
CONTROL MODULE
8E - 48
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the ignition on
•
Battery voltage between 10 and 16 volts
•
IOD fuse installed
•
Set Condition:
Bus messages not received from the Antilock Brake Module for approximately 500ms.
Possible Causes
CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
ANTILOCK BRAKE MODULE
ANTILOCK BRAKE MODULE POWER AND GROUND
MODULE THAT SET THIS DTC
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
Turn the ignition on.
With the scan tool, read active DTCs.
Is this DTC active?
Yes
>> Go To 2
No
>> Perform the Stored Lost Communication test procedure. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES - DIAGNOSIS AND TESTING)
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read all active DTCs from all CAN C Bus modules.
NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
>> Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms.
No
>> Go To 3
3.
VERIFY THAT THE ABS MODULE IS ACTIVE ON THE BUS
With the scan tool, select ECU View.
Verify that the ABS is active on the bus.
Is the ABS active on the bus?
Yes
>> Go To 4
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response diagnostic procedures.
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 49
4.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTCs “Logged Against” the ABS?
Yes
>> Replace/update the Antilock Brake Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
No
>> Replace/update the module that set this DTC in accordance with the service information
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
8E - 50
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
U0126-LOST COMMUNICATION WITH STEERING ANGLE SENSOR (SAS)
For a complete wiring diagram Refer to Section 8W.
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 51
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