Hydraulic Assembly: Testing and Inspection
HYDRAULIC UNIT (HU) INSPECTIONCAUTION: Always connect and disconnect the scan tool with the ignition switch in the OFF position.
1. Jack up the vehicle and support the vehicle with rigid racks placed at the specified jack-up points or place the wheels which are checked on the rollers of the braking force tester.
CAUTION:
1. The roller of the braking force tester and the tyre should be dry during testing.
2. When testing the front brakes, apply the parking brake, and when testing the rear brakes, stop the front wheels by chocking them.
2. Release the parking brake, and feel the drag force (drag torque) on each road wheel.
When using the braking force tester, take a reading of the brake drag force.
3. Turn the ignition key to the OFF position and set the scan tool as shown in the diagram.
4. After checking that the shift lever
NOTE:
1. At this time, the ABS system will switch to the scan tool mode and the ABS warning light will illuminate.
2. When the ABS has been interrupted by the fail-safe function, the scan tool actuator testing cannot be used.
5. Use the scan tool to force-drive the actuator.
6. Turn the wheel by hand and check the change in braking force when the brake pedal is depressed. When using the braking force tester, depress the brake pedal until the braking force is at the following values, and check to be sure that the braking force changes to the brake drag force inspected in step 2 when the actuator is force-driven.
The result should be as shown in the diagram.
7. If the result of inspection is abnormal, correct according to the "Diagnostic Table."
DIAGNOSTIC TABLE
8. After inspection, disconnect the scan tool immediately after turning the ignition switch to OFF.
SOLENOID VALVE CHECK
Measure the resistance between terminals.
Standard value: 1.O - 1.3 Ohms
MOTOR OPERATION CHECK
Connect the battery and check to be sure that the sound of the hydraulic unit motor operating can be heard.
CAUTION: The battery power should not be applied for more than 1 second