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Home >> Chevrolet >> 1998 >> Cavalier L4-2.2L VIN 4 >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Miscellaneous Tests >> Solenoid Test (On/Off)
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Solenoid Test (On/Off)

SOLENOID TEST (ON/OFF)
1. Turn the ignition switch to the OFF position.
2. Install a scan tool.
3. Turn the ignition switch to the RUN position.
4. Select SPECIAL FUNCTIONS, MANUAL CONTROL.
5. "Release'' the motor for the channel being tested.
6. Select the solenoid for the channel being tested.
7. With no brake pedal pressure applied, turn the solenoid ON.
8. Depress 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 check ball is leaking.

9. With brake pressure still applied, turn the solenoid OFF. The brake pedal should drop immediately. This verifies normal solenoid operation. If the pedal does not drop and the motor is moving, the solenoid is stuck ON or OFF. To verify which solenoid is stuck, ''apply,, the motor for the channel being tested.
^ If the brake pedal rises, the solenoid is stuck OFF (open) or the check ball is leaking.
^ If the pedal drops suddenly, the solenoid is stuck ON (closed).
^ If the pedal (while depressing) slowly sinks toward the floor or if it rises during the "apply,, of the motor, perform the following:

9.3.1. Physically switch the two solenoids.
9.3.2. Repeat the test for the channel in question.
A. If the pedal continues to sink, the check ball is leaking. Replace the Hydraulic Modulator. Refer to Hydraulic Modulator in Hydraulic Assembly.
B. If the test now works properly, test the other channel. If the pedal sinks or rises, replace the solenoid in this channel. Refer to Hydraulic Modulator Solenoid under Service and Repair.
C. If the test fails for the same channel, the check valve is leaking. Replace Hydraulic Modulator. Refer to Hydraulic Modulator under Hydraulic Modulator/Master Cylinder Assembly Repair.

IMPORTANT: After performing Step 9 it is necessary to bleed the brake system. Refer to Brake Bleeding Procedure.

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