Fuel Injector: Testing and Inspection

Checking Injector Operation:

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 rpm.

Checking Injector Operation:

- If you have no sound scope, you can check the injector transmission operation with your finger.
- If no sound or unusual sound is heard, check the wiring connector, injector or injection signal from the engine ECU.

Checking Injector Resistance:

Inspect Injector Resistance
- Disconnect the injector connector.
- Using an ohmmeter, measure the resistance between the terminals.

Resistance: Approx. 13.8 ohms

- If the resistance is not as specified, replace the injector.
- Reconnect the injector connector.

Hose Connection:

Inspect Injector Injection

CAUTION: Keep injector clear of sparks during the test.

- Disconnect the fuel hose from the fuel filter outlet.
- Connect union and hose to the fuel filter outlet with two new gaskets and the union bolt.

Torque: 29 N.m (300 kgf.cm, 22 ft.lbs)

HINT: Use the vehicle's fuel filter.

Hose Connection:

- Remove the pressure regulator from the delivery pipe, and connect the fuel return hose to the pressure regulator.
- Install a new 0-ring to the pressure regulator.
- Connect the hose to the pressure regulator with union and the two bolts.


Torque: 9.3 N.m (95 kgf.cm, 82 in.lbs)

- Install the grommet and a new 0-ring to the injector.

Hose Connection:

- Connect union and hose to the injector, and hold the injector and union with clamp.
- Put the injector into the graduated cylinder.

HINT: Install a suitable vinyl hose onto the injector to prevent gasoline from splashing out.

Jumper Installation:

- Using a jumper, connect terminals +B and FP of the check connector.
- Reconnect the battery negative (-) cable.
- Turn the ignition switch ON.

NOTICE: Do not start the engine.

Checking Injector Volume:

- Connect wire to the injector and battery for 15 seconds, and measure the injection volume with a graduated cylinder.
- Test each injector two or three times.


Volume:
40 - 50 cm3 (2.4 - 3.1 Cu in.) per 50 sec.

Difference between each injector:
5 cm3 (0.3 Cu in.) or less

- If the injection volume is not as specified, replace the injector.

Inspect Leakage
- Disconnect wire from the battery and check the fuel leakage from the injector.


Fuel drop:
One drop or less per minute

- Disconnect the battery negative (-) cable.
- Remove jumper wire.