Solenoid Test

SOLENOID TEST
Tools Required
Scan Tool
1. Turn the ignition switch to LOCK.
2. Install the brake cartridge into the scan tool and connect it to the data link connector (DLC). Power the scan tool using the battery adapter.
3. Turn the ignition switch ON, with the engine stopped.
4. Pump the brake pedal to deplete the vacuum from the power booster.
5. Select manual control.
6. Select left front or right front motor release.
7. Release the motor for the channel being tested. Check the motor command and feedback currents to be sure that the motor released properly.
8. Select the solenoid for the same channel.
9. With no brake pressure applied, turn the solenoid on.
10. Press the brake pedal. It should be very high and firm.
If the pedal goes nearly to the floor, the solenoid is leaking or not closing and/or the checkball is leaking. Go to step 12.
11. With brake pressure still applied, turn the solenoid off. If the brake pedal drops immediately toward the floor, operation is normal. End the test.
12. If the brake pedal does not drop and the motor is moving, the solenoid is stuck on.
13. Physically switch the two solenoids.
14. Repeat the test for the channel in question.
- If the pedal sinks slowly to the floor, the check valve is leaking, and the hydraulic modulator must be replaced.
- If the test now works properly, test the opposite channel. If the pedal sinks or rises, that solenoid must be replaced.