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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests - 7.4L >> Miscellaneous ECM/Pcm/VCM Controls >> Transmission (C-8) >> Converter Lock-Up Signal From ECM/PCM/VCM
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Converter Lock-Up Signal From ECM/PCM/VCM

  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. See Figure. Accelerate vehicle to 45 MPH and note test light. If test light does not illuminate, problem is a faulty ECM/PCM/VCM connector or ECM/PCM/VCM. On some models, lock-up signal may be checked at Data Link Connector (DLC) terminal "F" instead of at ECM/PCM/VCM terminal.
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