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 MANUALSTOYOTA19904RUNNER 2D UTILITY, 2.4 R, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - EFIIGNITION CHECKS (SUPRA TURBO)IGNITION SYSTEM CONNECTION CHECKS
1990 Toyota 4Runner 2D Utility, 2.4 R, Automatic
Ignition System Connection Checks
1990 Toyota 4Runner 2D Utility, 2.4 R, AutomaticSECTION Ignition System Connection Checks
- With ignition switch in OFF position, check connections of all 3 ignition coil primary circuits. Check for loose connections or corrosion. Tighten and/or clean connections as required.
- Check connection on primary feed wire to coil and ignitor. If loose or corroded connections exist, correct them and repeat SPARK TEST.
- If no spark output is observed or no problems were located and resolved in this test, proceed to IGNITION FEED CIRCUIT TEST under IGNITION COIL in this article.
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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.