Economizer check
1. Check the efficiency of the economizer, for which, with the engine running, disconnect the wires from the pneumatic valve.
2. The engine should shut down.
3. Check the tightness of the economizer diaphragm by supplying air at a pressure of 0.15 MPa to the economizer nozzle (1.5 kgf/cm2). No pressure drop is allowed within 10 s.
Checking the pneumatic valve
1. Turn on the ignition and use a voltmeter or test lamp to check if there is voltage on the air valve plugs.
2. Check the operation by disconnecting and connecting the wires to the air valve plugs. When the valve is actuated, a characteristic click should be heard.
3. Start the engine and disconnect the wires from the air valve. The engine should shut down.
4. The valve must be tight when air is supplied with an overpressure of 0.085 MPa (0.85 kgf/cm2) to an unmarked fitting or when applying a vacuum of 0.085 MPa (0.85 kgf/cm2) to fitting "1". Union "2" shut off when checking for leaks.
5. When applying a vacuum of 0.085 MPa (0.85 kgf/cm2) into the fitting "1" the valve must open when the 12 V electric voltage is applied and close when the voltage is removed.
6. The consumed current at a voltage of 12 V is 0.375 A. The minimum operating voltage at a temperature of -40 to 100°C, a vacuum at the fitting "1" 0.085 MPa (0.85 kgf/cm2) or excess pressure on an unmarked fitting 0.085 MPa (0.85 kgf/cm2), with closed fitting "2" should be 9 V.
Checking the microswitch
1. Disconnect the wires from the microswitch and use an ohmmeter or a test lamp with a power of not more than 5 W with a battery to check the operation of the microswitch by pressing and releasing its lever.
2. When the lever is pressed, the contacts of the microswitch should open (control lamp should go out). With a free lever, the contacts of the microswitch must be closed (control lamp on).
3. Check the microswitch setting as above and adjust if necessary.
Checking the pneumatic valve control unit
Checking the pneumatic valve control unit is described in subsection 9.13.