A/T - Diagnostic Strategy: Overview

9215bmw01

Group 24
Automatic Transmission


Bulletin Number
24 04 91 (3240)


Woodcliff Lake, NJ
December 1991
Product Engineering


SUBJECT: Automatic Transmission Diagnosis

MODELS: All so equipped


Problem: Unnecessary replacement of automatic transmissions.

Situation: An increasing number of automatic transmissions are being returned without any technical fault. This is especially true regarding the electronically controlled versions.

Accurate diagnosis of transmission problems is not complicated when approached methodically.

The following is intended as a general guide to help reduce unnecessary replacements by sharing the knowledge gained from studying a large population of transmission returns.

Action: Prior to any transmission replacement, the technician must first check the basics. A Hydraulic-Mechanical Checklist has been developed to assist in doing a thorough diagnosis. It is recommended to file a copy of the completed form in the vehicle's repair history file.