Remove fuel injector. See REMOVE/INSTALL/OVERHAUL article. Connect Injection Measuring Tool Set (9268-41045). See Fig 1. Attach a piece of vinyl tubing to bottom of fuel injector to prevent fuel splash. Put vinyl tubing into a graduated measuring cylinder.

Fig 1: Connecting Fuel Injection Measuring Tool Set (Similar)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If Lexus scan tester is not available, go to next. If using a Lexus scan tester, remove instrument panel fuse box cover and connect scan tester to Data Link Connector (DLC) No. 3. Turn ignition on. DO NOT start engine. Using scan tester manufacturer's instructions, activate electric fuel pump. Go to step 4).
Disconnect fuel pump connector. Connect battery voltage to specified terminals on fuel pump connector to activate fuel pump. See Fig 2. Go to next step.
Turn ignition on, engine off. Connect EFI Inspection Wiring (09842-30070) between fuel injector and a 12-volt battery for 15 seconds. Compare measured volume with specified volume. See FUEL INJECTOR VOLUME (15 SECONDS) table. Replace injector if one or more of the following conditions exists:
- Volume is not within specification.
- Difference in volume between injectors exceeds specification.
- More than one drop leaks from injector within one minute of disconnecting EFI inspection wiring from battery.

FUEL INJECTOR VOLUME (15 SECONDS)

Application	Cu. In. (cc)
Volume	3.4-4.3 (55-70)
Difference Between Injectors	0.6 (10)

Fig 2: Testing Fuel Pump

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Fuel Injector Volume