Remove the air filter.
Switch on the ignition, disconnect the hose 1 (see photo) from the thermal time switch and hose 2 from the tee of the vacuum ignition regulator and blow into these hoses.
At an intake air temperature of +20°C, the relay contacts must be open. At temperatures below 20°C, the relay should turn off approximately 15 seconds after the ignition is switched on.
To replace the relay, disconnect block 3 and remove the valve from the intake manifold.