)
- Use a stethoscope to listen to the operation sound (clicking) of the injectors while the engine is idling or cranking.
CAUTION- Verify that the operation sound increases with the engine speed.
NOTE: If the operating sound cannot be heard, inspect the injector actuation circuit.
Check the Injection Condition
- Following the steps below, bleed out the residual pressure within the fuel pipe line
to prevent flow of the fuel (Refer to
).
- Remove the injector.
- Assemble the following special tools as shown in Fig.
- Injector test set (MD998706)
- Injector test harness (MB991607)
- Injector test adaptor (MD998741)
- Clip (MB991608)
)
- Connect the MUT-II/III to the diagnosis connector.
- Turn the ignition switch to "ON" position (But do not start the engine).
- Select "Item No. 07" from the MUT-II/III Actuator test to drive the fuel pump.
)
- Activate the injector and check the atomized spray condition of the fuel.
The condition can be considered satisfactory unless it is extremely poor.
- Stop the actuation of the injector, and check for leakage from the injector's nozzle.
Standard value: 1 drop or less per minute
- Activate the injector without activating the fuel pump; then, when the spray emission of fuel from the injector stops, disconnect the special tool and restore it to its original condition.
- Disconnect the MUT-II/III.