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Home >> GMC >> 1998 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls - System & Component Testing 4.3L) >> Miscellaneous Pcm/VCM Controls >> Transmission >> Converter Lock-Up Signal From PCM/VCM
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Converter Lock-Up Signal From PCM/VCM

WARNING: This page is about a different car, the 1998 GMC Pickup and 1998 Chevrolet Pickup. 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. Accelerate vehicle to 45 MPH and note test light. If test light does not illuminate, problem is a faulty PCM/VCM connector or PCM/VCM.
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