Section 208 (Diagnosis - 42RE (W/TCM)): Introduction
WARNING: This page is about a different car, the 1995 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The first step in diagnosing any driveability problem is verifying the customer's complaint with a test drive under the conditions the problem reportedly occurred. Before entering self-diagnostics, perform a careful and complete visual inspection. Most transmission control problems result from mechanical breakdowns or poor electrical connections.
CAUTION:
Vehicle is also equipped with a separate Powertrain Control Module (PCM) which controls engine operation and performance. All engine related Diagnostic Trouble Codes (DTC) must be repaired before Transmission Control Module (TCM) codes are retrieved and repaired.