Solenoid Leak Test

Pressure Switch And Modulator Motor Connector Testing:

NOTE: If a solenoid leaks excessively, the brake fluid level in the modulator reservoir tank will rise when operating the ABS pump motor. The modulator reservoir may also overflow.

1. Disconnect the pump motor and pressure switch connectors.
2. Connect an ohmmeter between the YEL and YEL terminals of the pressure switch connector.
3. Attach the positive (+) lead of a fully charged 12V battery to the RED/WHT terminal of the motor connector and negative (-) lead to the GRN terminal, and install a switch between negative lead and GRN terminal as shown.
4. Turn the switch ON to allow sufficient pressure to build up within the accumulator and check for continuity. If the ohmmeter shows continuity (pressure switch turned ON), run the motor for 10 seconds more, then turn the switch OFF.
- Check if the solenoid hisses or squeaks. Replace the modulator if the solenoid hisses or squeaks.
- Check the pressure switch for continuity within 30 minutes. It is normal if there is continuity. If there is no continuity, a solenoid is faulty or a high-pressure line leaks.