Jeep Liberty KJ. Manual — part 1477
5.
(D25) PCI BUS CIRCUIT OPEN
Turn the ignition off.
Disconnect the scan tool from the DLC connector.
Measure the resistance of the (D25) PCI Bus circuit between the DLC
and the TCM connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Transmission Control Module in accordance
with the service information.
Perform the appropriate POWERTRAIN VERIFICATION
TEST.
No
>> Repair the (D25) PCI Bus circuit for an open.
Perform the appropriate POWERTRAIN VERIFICATION
TEST.
8E - 120
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
*NO RESPONSE FROM TCM (POWERTRAIN CONTROL MODULE) - NGC
For a complete wiring diagram Refer to Section 8W.
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 121
Possible Causes
(A209) B(+) CIRCUIT OPEN OR SHORTED
(Z903) GROUND CIRCUIT OPEN
(F1) FUSED IGNITION SW OUTPUT CIRCUIT OPEN OR SHORTED
(D65) CAN C BUS (+) CIRCUIT OPEN
(D64) CAN C BUS (-) CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
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, indicating 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 display a red X next to the module?
Yes
>> Go To 2
No
>> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent , pushed out, and corroded terminals.
2.
ATTEMPT TO COMMUNICATE WITH THE PCM
With the scan tool in ECU view, observe the status of the PCM.
Does the scan tool display a red X next to the PCM?
Yes
>> Refer to the No Response From PCM test procedure. Refer to the table of contents in this section.
No
>> Go To 3
3.
(Z903) GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM C4 harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.
Using a 12-volt test light connected to 12-volts, check the (Z903)
ground circuit.
Does the test light illuminate brightly?
Yes
>> Replace and program the Powertrain Control Module in
accordance with the service information.
Perform the appropriate VERIFICATION TEST.
No
>> Repair the (Z903) ground circuit for an open.
Perform the appropriate VERIFICATION TEST.
8E - 122
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
*CAN C BUS COMMUNICATION FAILURE
For a complete wiring diagram Refer to Section 8W.
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 123
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