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.
Hall Control Unit Check
- Be sure all connectors are securely connected. Connect voltmeter positive lead to ignition coil terminal 15. Attach negative lead to coil terminal 1. Turn ignition "ON". See Fig 1.
- Reading should be 2 volts, and then fall to 0 (zero) volts after 1-2 seconds. Leave voltmeter connected, but turn ignition "OFF". If voltage reading is correct, replace Hall control unit.
- If readings were not to specifications, disconnect 3-wire connector at distributor. Insert a metal pin in center contact of harness connector (Green/White wire). See Fig 2.
Check voltage at ignition coil primary terminals.
- Ground metal pin briefly. Turn ignition "ON". Voltage should increase briefly to at least 2 volts. Turn ignition "OFF". Remove pin and reconnect harness connector to distributor.
Momentarily ground pin inserted in center terminal.
- If test results were satisfactory, proceed to Hall Generator (Sending Unit) Check. If not to specifications, check for open circuit in wiring. If none is found, replace Hall control unit.
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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.
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