ABS/TCS HU/CM System Inspection
ABS/TCS HU/CM SYSTEM INSPECTIONSystem Inspection
Preparation
1. Verify that the battery is fully charged. With the ignition switch at ON, verify that the ABS and BRAKE system warning lights go out after 3 s.
2. If the lights stay on after 3 s, the ABS/TCS HU/CM detects a failure. Follow the troubleshooting procedures.
3. Turn the ignition switch off.
4. On level ground, jack up the vehicle and support it evenly on safety stands. Shift the transaxle to N position.
5. Release the parking brake.
6. Rotate the wheels by hand, and inspect for brake drag.
Operation of ABS inspection
1. Perform the "Preparation."
2. Connect M-MDS to the DLC-2.
3. Set up an active command mode inspection according to the combination of commands below.
The chart above shows an example of a right wheel inspection.
Note:
^ When working with two people, one should press on the brake pedal, the other should attempt to rotate the wheel being inspected.
4. Send the command while pressing on the brake pedal and attempting to rotate the wheel being inspected.
5. When pressure is being maintained, and a click sound indicating the solenoid is operating comes from the ABS/TCS HU/CM, confirm that the wheel does not rotate. When pressure is being reduced, and a click sound indicating the solenoid is operating comes from the ABS/TCS HU/CM, confirm that the wheel rotates, even though the brake pedal is being depressed.
Note:
^ To protect the ABS/TCS HU/CM, the solenoid valve used for simulations and the ABS motor stay on for 10 s each time they are switched on.
^ Performing the inspections above determines the following.
- The ABS/TCS HU/CM brake lines are normal.
- The ABS/TCS HU/CM hydraulic system is not significantly abnormal.
- The ABS/TCS HU/CM wiring is normal.
^ However, the following items cannot be checked.
- ABS/TCS HU/CM input system harness and parts.
- Extremely small leaks in the ABS/TCS HU/CM internal hydraulic system
- Unusual intermittent occurrences in the above items.