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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.
P1684-BATTERY DISCONNECTED DIAGNOSTIC TEST REFERENCE

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 Engine DTC's. Check and repair all Engine DTC's prior to performing any 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 flash level of Powertrain Control Module. Some problems are corrected by software upgrades to the Transmission and Engine software.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.ContinueGo To 2		 All
2 Has the battery been disconnected, lost it's charge, or been replaced recently?
Yes --> Disconnecting or replacing the battery will set this DTC. Erase the DTC.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 Has a Quick Learn procedure been performed?
Yes --> Performing QUICK LEARN  will set this DTC. Erase the DTC.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 4		 All
4 Has the PCM been replaced or disconnected?
Yes --> Replacing or disconnecting the PCM will set this DTC. Erase the DTC.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 5		 All
5 Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
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 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. If the fuse is open make sure to check for a short to ground.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .		 All
6 Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
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 Ground circuits in the appropriate terminal of special tool #8815.
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 for all the ground circuits?
Yes --> Go To 7
No --> Repair the Ground circuits for an open.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .		 All
7 The conditions necessary to set the 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 shorted and open circuits.
With the DRBIII®, check the EATX EVENT DATA to help identify the conditions in which the DTC was set.
Were there any problems found?
Yes --> Repair as necessary.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Test Complete.		 All
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