Initial Inspection and Diagnostic Overview

DIAGNOSIS AND TESTING - PRELIMINARY

IF VEHICLE IS DRIVABLE
1. Check for transmission fault codes using the DRB III* scan tool.
2. Check the fluid level and its condition.
3. Adjust the gearshift cable if the complaint was based on delayed, erratic, or harsh shifts.
4. Road test the vehicle and note how the transmission upshifts, downshifts, and engages.

IF VEHICLE IS DISABLED
1. Check the fluid level and its condition.
2. Check for a broken or disconnected gearshift cable.
3. Check for a cracked or leaking cooler line, loose or missing pressure-port plugs.
4. Raise and support the vehicle on safety stands, start the engine, shift the transmission into gear, and note the following:
a. If the propeller shaft turns but the wheels do not, inspect the differential and axle shafts.
b. If the propeller shaft does not turn and the transmission is noisy, stop the engine. Remove the transmission oil pan, and check for debris. If the pan is clear, remove the transmission and check for a damaged flexplate, torque converter, oil pump, or input shaft.
c. If the propeller shaft does not turn and the transmission is not noisy, perform the hydraulic-pressure test to determine if the concern is hydraulic or mechanical.