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.
1990 Toyota Tercel DX, AutomaticFACTORY OEM SERVICE PROCEDURE
Cold Start Injector
- Disconnect negative battery cable. Disconnect cold start injector wiring harness connector. Check resistance between terminals of injector. Replace injector if resistance is not 2-4 ohms. If resistance is okay, relieve fuel system pressure.
- Remove cold start injector from vehicle. Install fuel hose to injector. Install system Union Adapters (9268-41045) to delivery pipe and cold start injector. Connect fuel hose to union adapters. See Fig 1. Connect Jumper Harness (9842-30050) to cold start injector.
- Place container under cold start injector. Connect jumper wire to engine check connector terminals FP and B+ to pressurize fuel system. For engine check connector locations, See Figure. Turn ignition on, with engine off.CAUTION: Perform cold start injector connector test in shortest possible time.
- Connect probes of Fuel Injection Tester (09842-30070) to battery. Connect other end of tester to cold start injector. See Fig 1. Ensure fuel spray is an even cone shape.
- Disconnect fuel injector tester harness and observe cold start injector. Maximum leakage should be one drop per minute with fuel pressure applied. Clean or replace cold start injector if defective.
Factory Service Tools
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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.