Jeep Liberty KJ. Manual — part 1478
•
When Monitored:
With the ignition on.
•
Set Condition:
The scan tool cannot communicate with ANY module on the CAN C Bus circuit.
Possible Causes
(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE
(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE
(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND
(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND
(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT
ANTILOCK BRAKE MODULE
POWERTRAIN CONTROL MODULE (PCM or ECM)
STEERING ANGLE SENSOR
BODY CONTROL MODULE
Diagnostic Test
1.
VERIFY CAN C BUS COMMUNICATION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool select ECU View.
NOTE: A red X will be next to the module that is not communicating or not installed on the vehicle, indi-
cating that the module is not active on the Bus network. A green check indicates that the module is active
on the Bus network.
Does the scan tool communicate with any module on the CAN C Bus circuit?
Yes
>> The conditions that caused this symptom are not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring and connectors.
No
>> Go To 2
2.
CHECK THE D65 CAN C (+) AND (D64) CAN C (-) CIRCUITS FOR A SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (D65) CAN C Bus (+) circuit and the (D64)
CAN C Bus (-) circuit at the DLC.
Is the voltage steadily above 4.0 volts?
Yes
>> Go To 3
No
>> Go To 4
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
3.
(D65) CAN C BUS (+) CIRCUIT OR (D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the scan tool from the DLC.
NOTE: Perform the following steps for each module on the CAN C
Bus Circuit.
Measure the voltage between the (D65) CAN C Bus (+) circuit and the
(D64) CAN C Bus (-) circuit and ground at the DLC.
Disconnect a module, turn the ignition on and check if the module that
was disconnected was causing the short to voltage internally.
While monitoring the voltmeter, disconnect each module on the CAN C
Bus Circuit one at a time.
Is there any voltage present with all modules disconnected?
Yes
>> Repair the (D65) CAN C Bus (+) circuit or (D64) CAN C
Bus (-) circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the module in accordance with the service information that when disconnected eliminated the
short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
4.
CHECK THE (D65) CAN C BUS (+) CIRCUIT AND THE (D64) CAN C BUS (-) CIRCUIT FOR A SHORT TO
GROUND
Turn the ignition off.
Measure the resistance between the (D65) CAN C Bus (+) circuit and
ground and the (D64) CAN C Bus (-) circuit and ground at the DLC.
Is the resistance below 5.0 ohms on either circuit?
Yes
>> Go To 5
No
>> Go To 6
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 125
5.
(D65) CAN C BUS (+) CIRCUIT OR (D64) CAN C (-) CIRCUIT SHORTED TO GROUND
Turn the ignition off.
NOTE: Perform the following steps for each module on the CAN C
Bus Circuit.
Measure the resistance between the (D65) CAN C Bus (+) circuit and
the (D64) CAN C Bus (-) circuit and ground at the DLC.
Disconnect a module, check if the module that was disconnected was
causing the short to ground internally.
While monitoring the ohmmeter, disconnect each module on the CAN C
Bus Circuit one at a time.
Is the resistance below 5.0 ohms with all modules discon-
nected?
Yes
>> Repair the (D65) CAN C Bus (+) circuit or (D64) CAN C
Bus (-) circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the module in accordance with the service information that when disconnected eliminated the
short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
6.
(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT
NOTE: Perform the following steps for each module on the CAN C
Bus Circuit.
Measure the resistance between the (D65) CAN C Bus (+) circuit and
the (D64) CAN C Bus (-) circuit at the DLC.
Disconnect a module, check if the module that was disconnected was
causing the short internally.
While monitoring the ohmmeter, disconnect each module on the CAN C
Bus Circuit one at a time.
Is the resistance below 5.0 ohms with all modules discon-
nected?
Yes
>> Repair the (D65) CAN C Bus (+) circuit for a short to the
(D64) CAN C Bus (-) circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the module in accordance with the service information that when disconnected eliminated the
short.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
*PCI BUS COMMUNICATION FAILURE
For a complete wiring diagram Refer to Section 8W.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
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