![](../../../img/13/AK300696AC00ENG.png)
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1.Use a stethoscope to
listen to the operation sound (clicking) of the injectors
while the engine is idling or cranking.
caution |
Beware that the operation
sounds of other injectors can be heard even if
the injector that is being inspected might not
be operating.
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2.Verify that the operation sound increases
with the engine speed.
note |
If the operating sound cannot
be heard, inspect the injector actuation
circuit.
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1.Disconnect the injector
connector.
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2.Measure the resistance
between terminals. Standard value: 10.5 -
13.5 Ω (at 20°C)
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3.Connect the injector
connector.
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1.Carry out the procedure to
prevent flow of the fuel (Refer to ).
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2.Remove the fuel
high-pressure hose at the delivery pipe side.
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![](../../../img/13/AK303686AC00ENG.png)
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3.Remove the
injector. 4.Assemble Injector Test Set (MD998706)
of the special tool as shown in Fig.
- Install the injector to the installation
hose for the injector and then fix it using Injector
Holder (MB991976) of the special tool.
- Install Injector Test Adaptor (MD998741) of
the special tool to another hose connected with the
installation hose for the injector.
- Fold, band and tie up the rest of hose
completely in order to prevent from fuel leakage
because it is not used.
5.Install Injector Test Set (MD998706) of the
special tool to the fuel high-pressure
hose. 6.Connect the M.U.T.-III to the diagnosis
connector. 7.Turn the ignition switch to "ON"
position (but do not start the engine). 8.Select
"Item No. 07" from M.U.T.-III actuator test and drive the
fuel pump.
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![](../../../img/13/AK303687AC00ENG.png)
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9.Connect Injector Test
Harness (MB991607) of the special tool between the injector
and battery, and then actuate the
injector. 10.Check the fuel spray condition. The
condition can be considered satisfactory unless it is
extremely poor. 11.Stop actuating the injector.
Check leakage from the injector nozzle. Turn the ignition
switch to "LOCK OFF" position and then disconnect
M.U.T.-III. 12.Actuate the injector until the fuel
cannot flow. Draw the fuel out from the special
tool. 13.Remove the special tool. 14.If
the fuel spray condition is extremely poor or if there is
the fuel leakage from the injector nozzle, replace the
injector. 15.Install the injector and fuel
high-pressure hose.
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