Disconnect the green control wire from the ignition.
Remove air filter.
Checking the supply voltage
Disconnect the coolant temperature sensor connector.
Remove the cold start valve plug (98). Use a voltmeter to measure the voltage between the black-pink wire of the connector and the ground of the engine block.
Turn on starter. If the voltage is about 10 V, remove and check the cold start valve. Otherwise, according to the diagram, check for an open circuit in the wire between the cold start valve and the fuel pump relay, respectively, between slot 2 on the relay board and terminal 9 of the control unit. Replace wire if necessary.
If no fault is found, connect a voltmeter between socket 12 (terminal 50) on the relay board and ground. During starter operation, this voltage should be approximately 10 V. In this case, replace the fuel pump relay, otherwise eliminate the open circuit according to the circuit.
Checking the cold start valve
Relieve excess pressure in the fuel system.
The temperature sensor wire remains disconnected, the fuel pump relay is in place.
Unscrew the cold start valve fuel line.
Unscrew the cold start valve, screw the fuel line to it and lower the valve into a measuring cup.
Plug in the cold start valve.
Remove the fuel pump relay and bridge pins 1 and 2. Connect to "pole" battery.
The valve must spray the fuel in a uniform cone.
Dry the valve nozzle.
It should not have a drop of gasoline on it for a minute.
Plug in the temperature sensor plug.
Fit the cold start valve with a new gasket, tighten the fuel line to 10 Nm.
Connect the green ignition control wire.
Install an air filter.