Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK WIRING AND CONNECTORS
Ignition on, engine not running.

With the scan tool, monitor the Transmission Temperature.

Apply the parking brake.

With the brakes firmly applied, place the gear selector in Drive.

While monitoring the scan tool, wiggle the wires and connectors from the TCM to the Electrohydraulic Control Unit.

Did the transmission temperature fluctuate while wiggling the wires?

Yes
1. Repair the wiring and/or connectors as necessary.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 2).
2) CHECK IF DTC RESETS
Replace the Transmission Temperature Sensor - P/N Switch. Refer to SERVICE INFORMATION - NAG1 for proper service procedure.

Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .

With the scan tool, read Transmission DTCs.

Did DTC P0714 reset?

Yes
1. Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the Service Information. Refer to ELECTRONIC CONTROL MODULES - SERVICE INFORMATION for the appropriate service procedure.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Test Complete.