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 MANUALSGMC1996SAVANA SPECIAL 6.5 YREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTING - G SERIES (DIESEL)FUEL SYSTEMGLOW PLUG CONTROLLER
1996 GMC Savana Special 6.5 Y
Glow Plug Controller
1996 GMC Savana Special 6.5 YSECTION Glow Plug Controller
- Ensure coolant temperature is less than 80°F (27°C) before beginning test. Place ignition switch in RUN position and allow glow plugs to cycle. After 2 minutes, crank engine for one second. It is NOT important that engine starts. Return ignition switch to RUN position. Glow plugs should cycle on at least once.
- If glow plugs do not cycle, disconnect controller (controller is located on top rear of valve cover). Connect test light between Pink/Black wire terminal of harness connector (terminal "A") and ground. See Figure . With ignition switch in RUN position, test light should be off. Test light should illuminate when engine is cranked.
- If test light does not illuminate as specified, repair short or open in engine harness Pink/Black wire. If test light illuminates as specified but glow plugs do not cycle, replace controller.
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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.