Function test
1. Disconnect the hose from the fuel return pipe and lower its end into the prepared container. Seal the open end of the tubing to prevent dirt from entering the system.
2. Connect a tachometer and have an assistant start the engine.
3. At engine speeds over 1,400 rpm, fuel should flow out of the hose with weak jolts.
4. Below 1250 rpm, there should be a slight continuous flow of fuel into the container.
Status check
1. Disconnect the fuel return solenoid valve electrical connector and apply battery voltage to the valve terminals. Blow into the end of the fuel return hose. There must be free passage.
2. Remove battery voltage from the valve and blow into the return hose again. This time there should be no permeability.
3. If any of the above conditions are not met, replace the valve.
Loop Status Check
Note. All checks are made on the engine speed block located above the fuse mounting block. Probing of contacts should be made from the reverse side of the electrical connector. Body metal acts as a mass. The location of the terminals is shown in the accompanying illustration.
1. Using an ohmmeter, check for continuity between terminal C and ground. conduction must take place.
2. Using a voltmeter, check for the presence of battery voltage at terminal D.
3. With the ignition on, check for the presence of battery voltage at terminal B.
4. Start the engine and gradually increase its speed. The voltage at terminal B should drop slightly.
5. At engine speeds below 1250 rpm, check for the presence of battery voltage at terminal A.
6. At speeds above 1,400 per minute, there should be no voltage at terminal A.
7. If the above checks give a positive result, most likely it is necessary to replace the engine speed unit.
Removing
1. Disconnect the negative cable from the battery.
2. Disconnect the fuel return solenoid valve electrical connector.
3. Install a drain container under the valve and disconnect the fuel hoses.
4. Give fixing bolts and remove the electromagnetic valve of return of fuel from the car.
Installation
Installation is in the reverse order.
1. Before connecting, check the condition of the fuel hoses.
2. Start the engine and check for fuel leaks.