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Automatic Transaxle Diagnosis - 4T40-E & 4T45-E: Overview Oldsmobile Alero I

Automatic Trans

DESCRIPTION & OPERATION

Note. For additional information on transaxle operation, see appropriate OVERHAUL article.

Test Description

The numbers listed below refer to step numbers in the diagnostic procedure

  1. 1 Determines if the scan tool is receiving power through the DLC.
  2. 2 MIL should illuminate whenever the ignition is on and the engine is not running.
  3. 3 Determines if the PCM is transmitting class 2 serial data to the DLC, and that the Class 2 data circuit is not open or shorted.
  4. 4 Determines if a DTC is current or stored in history.

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