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, 3.0 V, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - EFIIGNITION CHECKS (EXCEPT SUPRA TURBO)SPARK TEST
1990 Toyota 4Runner 2D Utility, 3.0 V, Automatic
Spark Test
1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Spark Test
- On models with integral ignition coil, disconnect spark plug wires. Remove spark plugs. Install spark plugs to each spark plug wire. Ground spark plugs.
- On models with an external ignition coil, disconnect high-tension (coil) wire from distributor. Hold wire about 1/2" away from ground.CAUTION: To prevent gasoline from being injected, do not crank engine for more than 2 seconds.
- On all models, crank engine and check for spark. If spark does not occur, check ignition coil, ignitor and distributor connections.
- If connections are good, check resistance of high-tension wires. See IGNITION HIGH-TENSION WIRE RESISTANCE table. If resistance is within specification, go to next step. If resistance is not within specification, replace wires.
- Check power supply to ignition coil and ignitor. Place ignition switch in ON position. Check for voltage at ignition coil positive terminal. If voltage is present, go to next step. If voltage is not present, check wiring between ignition switch, coil, and ignitor.
- Check ignition coil resistance. See IGNITION COIL RESISTANCE TESTS in this article. If ignition coil resistance is not as specified, replace coil. If coil resistance is within specification, go to next step.
- Check pick-up coil resistance. See PICK-UP COIL RESISTANCE TEST in this article. If resistance is within specification, go to next step. If pick-up coil resistance is not as specified, replace pick-up coil or distributor assembly.
- Check air gap between reluctor and pick-up coil. See PICK-UP COIL AIR GAP CHECK in this article. If air gap is correct, go to next step. If air gap is incorrect, replace distributor assembly.
- Check ignition IGT signal from ECU. See appropriate Code 14 chart in TESTS W/CODES article in this section. If IGT signal is okay, replace ignitor.
CAUTION:
A loss of either IGT or IGF signal will cause a no-start condition.
IGNITION HIGH-TENSION WIRE RESISTANCE
| Application | Ohms |
|---|---|
| All Models | 25,000 Max. Per Wire |
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.