a) Check for conductivity between terminals "5" and "6" of connector A.
b) Check for conductivity between terminals "4" (positive probe of ohmmeter) and "6" (negative probe of ohmmeter) connector A and no conductivity - when the ohmmeter probes are connected in reverse.
Note: Observe the polarity when connecting the ohmmeter probes (see picture).
c) Check for conductivity between terminals "4" (positive probe of ohmmeter) and "5" (negative probe of ohmmeter) connector A and no conductivity - when the ohmmeter probes are connected in reverse.
If the conditions are not met, replace the relay.
2. Check the operation of the solenoid valve relay.
a) Apply battery voltage to terminal "1" of connector A and terminal "3" of connector B.
b) Make sure there is conductivity between terminals "2" and "5" of connector A, and there is no conductivity between terminals "5" and "6" of connector A.
3. Check the operation of the electric pump relay.
a) Apply battery voltage to terminals "3" and "4" of connector B.
b) Make sure there is conductivity between terminals "1" and "2" of connector B.