On Vehicle Inspection

Checking Injector Operation:

ON-VEHICLE INSPECTION
1. Inspect injector operation.
- Check operation sound from each injector.
- With the engine running or cranking, use a sound scope to check that there is normal operating noise in proportion to engine speed.




- 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 or injection signal from the Engine Control Module (ECM).




2. Inspect injector resistance.
- Remove the throttle body together with the intake air connector.
- Disconnect the injector connectors.
- Using an ohmmeter, measure the resistance between the terminals.

Resistance: At 20°C (68°F): 13.4 - 14.2 Ohms

- If the resistance is not as specified, replace the injector.
- Reconnect the injector connectors.
- Reinstall the throttle body together with the intake air connector.