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Home >> GMC >> 1996 >> Forward Control 4.3 W >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Engine Controls - System/Component Tests - 7.4L) >> Miscellaneous ECM/Pcm/VCM Controls >> Transmission (C-8) >> Converter Lock-Up Signal At Transmission
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Converter Lock-Up Signal At Transmission

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Suburban, 1995 GMC Rally Camper Special, and 1995 GMC Rally. 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. Disconnect converter clutch connector at transmission. Connect a test light across converter clutch harness terminals. See Figure. Start engine and place transmission in Drive. Accelerate vehicle to 45 MPH and note test light.
  3. If test light is not on, check solenoid power supply wire of harness for open or short to ground. Check ground circuit for open between harness connector and ECM/PCM/VCM. If harness is okay, see CONVERTER LOCK-UP SIGNAL FROM ECM/PCM/VCM below.
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