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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> Diagnostic System Check - Automatic Transmission >> Test Description

Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 1. This step determines if the scan tool is receiving power through the DLC connector.
  2. 2. The MIL should illuminate whenever the ignition is ON and the engine is not running.
  3. 3. This step 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. This step determines if a DTC is current or stored in history.
Fig 1: Diagnostic System Check - Automatic Transmission
G02424317Courtesy of GENERAL MOTORS CORP.
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