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.
1978 Subaru GF Automatic TransFACTORY OEM SERVICE PROCEDURE
Primary Circuit Check
- Ensure ignition switch is off. Disconnect ignition unit 2-pin connector from unit. Turn ignition on. Connect negative lead of voltmeter to ground and positive lead to Blue wire terminal of connector. See Fig 1. Measure voltage and turn ignition off.
- If voltmeter reads battery voltage, proceed to IGNITION UNIT & PICK-UP COIL CHECKÂ . If voltage is not within battery voltage, check condition and continuity of primary circuit wiring and connectors. If no problems are found, proceed to IGNITION COIL CHECKÂ .
Factory Service Tools
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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.