Cold Start Injector Test
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Toyota Pickup, 1990 Toyota Cab & Chassis, 1990 Toyota 4Runner, 1989 Toyota Pickup, and 1989 Toyota Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
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 .
- 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.