Jeep Grand Cherokee WK. Manual — part 348
*NO RESPONSE FROM TCM - NAG1/DIESEL (CONTINUED)
5.
(D64) CAN C BUS (-) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (-) circuit between
the FCM connector and the TCM connector.
Is resistance below 5.0 ohms?
Yes
>> Replace the Transmission Control Module in accordance
with the service information.
Perform NAG1/Diesel TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Repair the (D64) CAN C Bus (-) circuit for an open.
Perform NAG1/Diesel TRANSMISSION VERIFICATION
TEST - VER 1.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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*NO RESPONSE FROM TCM (POWERTRAIN CONTROL MODULE) - NGC
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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*NO RESPONSE FROM TCM (POWERTRAIN CONTROL MODULE) - NGC (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(A209) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z903) GROUND CIRCUIT OPEN
(F942) (F26) 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.
NOTE: Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding.
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
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*NO RESPONSE FROM TCM (POWERTRAIN CONTROL MODULE) - NGC (CONTINUED)
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 each (Z903)
ground circuit.
Does the test light illuminate brightly for each circuit?
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.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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