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Converter Lock-Up Signal From ECM

  1. Warm engine to operating temperature. Raise vehicle and support drive wheels. Support suspension where necessary to prevent damage to drive axles.
  2. Connect a test light to battery voltage. Touch TCC control driver terminal with test light. On some vehicles, this is terminal "F" of the ALDL connector. See Fig 1-Fig 6 . Accelerate vehicle to 45 MPH and note test light. If test light does not illuminate, problem is a faulty ECM connector or ECM.
NOTE: In the following schematics, Assembly Line Data Link (ALDL) connector is also referred to by manufacturer as Data Link Connector (DLC).
Fig 1: Converter Clutch Schematic (5.0L & 5.7L TBI - "B" Body)
G91G07655Courtesy of GENERAL MOTORS CORP.
Fig 2: Converter Clutch Schematic (4.9L "C" Body)
G93J39585Courtesy of GENERAL MOTORS CORP.
Fig 3: Converter Clutch Schematic (4.9L "E" & "K" Bodies)
G93A39586Courtesy of GENERAL MOTORS CORP.
Fig 4: Converter Clutch Schematic (5.7L PFI - "F" Body)
G93B39587Courtesy of GENERAL MOTORS CORP.
Fig 5: Converter Clutch Schematic (5.7L PFI - "Y" Body)
G92I05474Courtesy of GENERAL MOTORS CORP.
Fig 6: Converter Clutch Schematic (5.7L TBI - "D" Body)
G93C39588Courtesy of GENERAL MOTORS CORP.
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