On-Vehicle Inspection

Remove 4 nuts and engine cover.

Check operation sound from each injector.

1. With the engine running or cranking, use a sound scope to check that there is normal operating noise in proportion to engine speed.
Fig 1: Using Sound Scope To Check Normal Operating Noise In Proportion To Engine Speed
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2. If you have no sound scope, you can check the injector transmission operation with a screwdriver.

If no sound or an unusual sound is heard, check the wiring connector, injector or injection signal from the ECM.

Fig 2: Checking Wiring Connector, Injector Or Injection Signal From ECM

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1. Disconnect the injector connectors.
2. Using an ohmmeter, measure the resistance between the terminals.

   Resistance: 13.4-14.2 Ω at 20°C (68°F) 

   If the resistance is not as specified, replace the injector.

   Fig 3: Using An Ohmmeter To Measure Resistance Between Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the injector connectors.

Install the engine cover with the 4 nuts.