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 MANUALSGMC1995FORWARD CONTROL 4.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 91 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 5.9L DIESEL)COMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM)POWER CIRCUITS
1995 GMC Forward Control 4.3 Z, Standard
Power Circuits
1995 GMC Forward Control 4.3 Z, StandardSECTION Power Circuits
WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Connect negative voltmeter lead to chassis ground and positive lead to PCM harness connector terminal No. 3. See Fig 1 . If battery voltage does not exist, repair open circuit between PCM and power distribution center. See appropriate WIRING DIAGRAM in the WIRING DIAGRAMS section.
- Turn ignition on. Connect negative voltmeter lead to chassis ground and positive lead to PCM harness connector terminal No. 9. See Fig 1 . If battery voltage does not exist, repair open circuit between PCM and ignition switch. See appropriate WIRING DIAGRAM in the WIRING DIAGRAMS section.
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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.