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.
Power Transistor
1991 Hyundai Sonata V6-3.0LSECTION Power Transistor
Ignition Timing Control System:
The Ignition Timing Control System operates by the ECU controlling the ignition timing through the power transistor. The ECU uses all of the engine condition and vehicle operating condition sensors (during normal driving conditions) to compute the correct spark advance or retard (during engine cranking, the ignition timing is fixed at 5°BTDC). The ECU uses the power transistor to control the ignition spark.
Power Transistor Location:
Power Transistor:
The power transistor (located on the drivers side of the firewall) functions to control the ignition timing by interrupting the ignition coil primary current ground causing secondary circuit discharge. The power transistor is a solid state component.
RENDER: 1.0x
NO RELATED
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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.