Cold Start Injector Test

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 3-5 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. See Fig 2.
Place container under cold start injector. Turn ignition on, with engine off. Connect jumper wire to engine check connector terminals "FP" and "+B" to pressurize fuel system. For engine check connector location, see Figure. Fuel pump check connector is 2-wire connector near airflow meter in left rear corner of engine compartment (White/Black and Green wires).

Fig 1: Location of Check Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CAUTION: Perform cold start injector connector test in shortest possible time.
Connect probes of Fuel Injector Tester (09842-30070) to battery. See Fig 2. Connect other end of tester to cold start injector.
Ensure fuel spray is an even cone shape. Disconnect fuel injector tester harness and observe cold start injector. See Fig 3. Maximum leakage should be one drop per minute with fuel pressure applied. Clean or replace cold start injector if defective.

Fig 2: Connecting Battery to Test Cold Start Injector Spray Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Disconnecting Tester From Battery to Check For Leakage

NOTE: Cold start injector is controlled by cold start injector time switch when ignition switch is turned on. See the WIRING DIAGRAMS artticle in this section.