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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 TEST REFERENCE - P1793-TRD LINK COMMUNICATION ERROR

TEST ACTION APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.
With the DRBIII®, read the engine DTC's. Check and repair all engine DTC's prior to performing transmission symptom diagnostics.With the DRBIII®, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary.Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for P0706 CHECK SHIFTER SIGNAL .For Gear Ratio DTC's, check and record all CVI's.Most DTC's set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.
NOTE: Verify the flash level of the transmission controller. Some problems are corrected by software upgrades to the transmission controller.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.ContinueGo To 2		 All
2 With the DRBIII®, check for other transmission DTC's
Are any of the DTCs P1694, P0731, P0732, P0733, P0734, and/or P1736 present also?
Yes --> If any of these DTCs are present, disregard the P1793 DTC. Refer to the TRANSMISSION CATEGORY  and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 With the DRBIII®, Check the STARTS SINCE SET counter for P1793.
NOTE: This counter only applies to the last DTC set.

Is the STARTS SINCE SET set at 0?
Yes --> Go To 4
No --> Go To 9		 All
4 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the PCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Torque Management Request Sense circuit from the TCM harness connector to the PCM harness connector.
Is the resistance above 5.0 ohms?
Yes --> Repair the Torque Management Request Sense circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 5		 All
5 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the PCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the Torque Management Request Sense circuit.
Is the resistance below 5.0 ohms?
Yes --> Repair the Torque Management Request Sense circuit for a short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 6		 All
6 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.
Measure the voltage of the Torque Management Request Sense circuit in the TCM harness connector.
Is the voltage above 10.5 volts?
Yes --> Repair the Torque Management Request Sense circuit for a short to voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 7		 All
7 Turn the ignition switch to the lock position.
Disconnect the TCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Torque Management Request Sense circuit in the TCM harness connector.
Is the voltage above 7.0 volts?
Yes --> Replace the Transmission Control Module per the Service Information. WITH THE DRBIII® PERFORM QUICK LEARN 
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 8		 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 and program the Powertrain Control Module per the Service Information. After completion of the Powertrain Verification test make sure to Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
Perform POWERTRAIN VERIFICATION TEST VER - 2 .		 All
9 The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorts and open circuits.
With the DRBIII®, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.
Were there any problems found?
Yes --> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Test Complete.		 All
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