Place a clean towel around the solenoid valve to remove any gasoline residue. Then loosen the screws and remove the solenoid valve.
CAUTION: Wipe off all traces of gasoline before testing. Ground the solenoid valve before removing it for testing to avoid sparking or flames when the ignition is turned on.
Ground the valve in a location as far away from the carburetor as possible.
Turn the ignition ON.
If the electromagnetic valve operates, then see point A). If not, then point B).
A) Reinstall the valve.
Start the engine and allow it to warm up to operating temperature until the cooling fan comes on.
Block the rear wheels and apply the parking brake. Jack up the front of the car and support it securely with stands.
Shift the transmission into second gear and accelerate the engine.
Release the accelerator pedal quickly and measure the voltage between terminal 28 (Green/Red(+)) and
32 (Black(-)) control unit. Should be measured during braking at a speed of over 20 km/h.
If there is voltage, then you should refer to the control module input diagnostics section. If not, then the solenoid valve is normal.
B) Turn off the ignition.
Disconnect the 2-pin connector near the solenoid valve.
Turn on the ignition.
Measure the voltage between the Green/Red (+) wire and the ground wire in the engine wiring harness.
If there is battery voltage, then the solenoid valve should be replaced.
If not, then you should check the Green/Red wire between the valve and terminal 28 of the control unit. If the wire is normal, then you should refer to the diagnostics section of the control module inputs.