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 - SYSTEM/COMPONENT TESTS - EFIFUEL SYSTEMSCOLD START INJECTOR TEST
1990 Toyota 4Runner 2D Utility, 2.4 R, Automatic
Cold Start Injector Test
1990 Toyota 4Runner 2D Utility, 2.4 R, AutomaticSECTION Cold Start Injector Test
NOTE:
Cold start injector is controlled by cold start injector time switch when ignition switch is turned on. See appropriate WIRING DIAGRAMS article.
- Cold start injector and cold start injector time switch are both fed current from ignition switch during cranking. Cold start injector ground circuit is controlled by cold start injector time switch. To test cold start injector, unplug cold start injector wiring harness. Check resistance between terminals of injector. Resistance should be 2-4 ohms. Replace injector if defective.
- To check cold start injector spray pattern and leakage, relieve fuel system pressure. Remove cold start injector from vehicle.
- Install fuel hose to injector. If original hose is too short, use Fuel Injection Kit (09268-41045) to extend the hose length and add a union.
- Place container under cold start injector. Turn ignition on, with engine off. On all models, connect jumper wire to engine check connector terminals "FP" and "+B" to pressurize fuel system. For engine check connector locations, See Figure or Figure
. Fuel pump check connector is 2-wire connector near airflow meter in left rear corner of engine compartment (White/Black and Green wires).CAUTION: Perform cold start injector connector test in shortest possible time.
- Connect probes of Fuel Injector Tester (09842-30070) to battery. Connect other end of tester to cold start injector. See Fig 1 and Fig 2 .
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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.