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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - *NO RESPONSE FROM TRANSMISSION CONTROL MODULE - DIESEL ONLY

TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
NOTE: As soon as one or more module communicates with the DRB, answer the question.

With the DRB, attempt to communicate with the Airbag Control Module.
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or establish communications with either of the modules?
Yes --> Go To 2
No --> Refer to the Body Communication category and perform the symptom PCI BUS COMMUNICATION FAILURE .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
2 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output (Run/St) circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?
Yes --> Go To 3
No --> Repair the Fused Ignition Switch Output (Run/St) circuit for an open. Refer to SYSTEM WIRING DIAGRAMS .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
3 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Remove the starter relay from the PDC.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output (Start) circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Observe the test light while momentarily turning the ignition switch to the Start position.
Does the test light illuminate brightly?
Yes --> Go To 4
No --> Repair the Fused Ignition Switch Output (Start) circuit for an open. Refer to SYSTEM WIRING DIAGRAMS .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
4 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
With a voltmeter in the millivolt scale, measure the voltage of the Fused Ignition Switch Output (Start) circuit.
NOTE: A no response condition can exist if voltage is present on this circuit with the ignition switch in any position except for the Start position.
NOTE: Voltage up to .080 millivolts can cause this condition.
NOTE: Check for after market components that could cause this condition.

Perform this step with the Ignition Switch in every position except for the Start position.
Is any voltage present?
Yes --> Repair the Fused Ignition Switch Output (Start) circuit for a short to voltage. Refer to SYSTEM WIRING DIAGRAMS .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .
No --> Go To 5
NOTE: Reinstall the original Starter Relay.
 All
5 Turn the ignition off.
Disconnect the TCM harness connector.
Using a 12-volt test light connected to ground, check the Fused B(+) circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?
Yes --> Go To 6
No --> Repair the Fused B(+) circuit for an open. Refer to SYSTEM WIRING DIAGRAMS .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
6 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Using a 12-volt test light connected to 12-volts, check each ground circuit in the TCM harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly at all the ground circuits?
Yes --> Go To 7
No --> Repair the Ground circuit(s) for an open. Check the main ground connection to engine block and/or chassis. Refer to SYSTEM WIRING DIAGRAMS .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
7
NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, refer to the appropriate test and repair as necessary.
Disconnect the TCM harness connector.Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.Connect the scope input cable to the channel one connector on the DRB. Attach the red and black leads and the cable to probe adapter to the scope input cable.With the DRBIII® select Pep Module Tools.Select lab scope.Select Live Data.Select 12 volt square wave.Press F2 for Scope.Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the TCM connector.Turn the ignition on.Observe the voltage display on the DRB Lab Scope.Does the voltage pulse from 0 to approximately 7.5 volts?Yes --> Go To 8No --> Repair the PCI Bus circuit for an open.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
8 Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace the Transmission Control Module in accordance with the service information. WITH THE DRBIII® Perform QUICK LEARN .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1  .		 All
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