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Home >> GMC >> 1997 >> Forward Control 6.5 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - System/Component Tests - 5.7L.) >> 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

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 1996 GMC Yukon, 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Suburban, and 1996 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
  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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