Injector Needle Valve Plunger Wiring Terminal INJECTION INLET Coil FI0495 ON-VEHICLE INSPECTION 1. CHECK INJECTOR OPERATION Check operating sound from the each injector. (a) With the engine running or cranking, use a sound scope to check that there is normal operating noise in proportion to engine rpm. Sound Scope Injector FI1005 (b) If you have no sound scope, you can check the injector transmission operation with your finger. If no sound or an unusual sound is heard, check the wiring connector, injector, resistor or injection signal from computer. Injector A FI1006 2. MEASURE RESISTANCE OF INJECTOR (a) Disconnect the wiring connector from the injector. (b) Using an ohmmeter, check the continuity of both terminals. Resistance: 1.5 - 3.0 Ω Ohmmeter FI0683