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Diagnostic Aids

Diagnostic aids located in many trouble code charts are additional tips used to help diagnose trouble codes when circuit checks do not find a problem.

NOTE: In following diagnostic tests, schematics and illustrations are courtesy of General Motors Corp. Powertrain Control Module (PCM) may also be referred to as Transmission Control Module (TCM) in some diagnostic charts and figures. Terms are used interchangeably.
NOTE: If specific DTC diagnostic test is not included in gasoline or Diesel diagnostic tests, refer to 4L60-E ELECTRONIC CONTROLS article under DIAGNOSTIC CHARTS for specific DTC. Diagnostic tests not included in gasoline or Diesel diagnostic tests are same as 4L60-E diagnostic test procedures.
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