Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987HI-CUBE 6.2 J, 475/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 6.5L DIESEL)MISCELLANEOUS ECM CONTROLSTRANSMISSION (C-8)CONVERTER LOCK-UP SIGNAL FROM ECM
1987 Chevrolet Hi-Cube 6.2 J, 475/M40
Converter Lock-Up Signal From ECM
1987 Chevrolet Hi-Cube 6.2 J, 475/M40SECTION Converter Lock-Up Signal From ECM
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to operating temperature. Raise vehicle and support drive wheels. Support suspension where necessary to prevent damage to drive axles.
- 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 connector or ECM. On some models, lock-up signal may be checked at Data Link Connector (DLC) terminal "F" instead of at ECM terminal.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.