Hydraulic Control Test (F2)

NOTE: This test is used to verify base brake apply and Antilock Brake System (ABS) release, hold and apply function.

1. Turn ignition switch to " LOCK".
2. Raise the vehicle such that all wheels to be tested are off the ground.
3. Install TECH-1 with ABS/Air Bag Cartridge.
4. Turn ignition switch to "ON". Place transaxle into neutral.
5. Select a channel to test; left front, right front, or rear. When testing the rear brakes, both rear wheels should rotate and not rotate together at the various points in the test; this is true because both rear brake pressures are controlled together.
6. Firmly depress brake pedal. Pedal should remain high and firm.
7. Have an assistant attempt to rotate the wheel being tested. If the wheel does not rotate, base brake apply is working properly.
8. With the brake pedal still depressed, press the up arrow key on the TECH-1 to start the test. The TECH-1 will display "Release" on the screen. Your assistant should be able to rotate the wheel being tested during the release portion of the test (approximately 2 seconds long). This verifies ABS pressure release. The brake pedal should remain high and firm. (If the brake pedal moves toward the floor, verify the solenoid electrical connectors are connected to the correct solenoids).
9. The TECH-1 will switch to the "Hold" mode and display the word "Hold" on the screen along with an 18 seconds decrement counter. With the brake pedal still depressed, have your assistant attempt to rotate the wheel. The wheel should rotate for the full 18 seconds of the test. This verifies ABS pressure hold.
10. When the hold portion of the test is complete, brake pressure will be applied and a slight bump may be felt in the pedal. This is normal. The assistant should not be able to rotate the wheel at the point. This verifies ABS apply.