Hydraulic Control Assembly - Antilock Brakes: Testing and Inspection
HYDRAULIC UNIT CHECKRequired Special Tools:
^ MB991958: M.U.T.-III Sub Assembly
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
1. Raise the vehicle using a jack and support the specified points with a rigid rack.
CAUTION:
Before connecting or disconnecting scan tool, always turn the ignition switch to the LOCK (OFF) position.
2. Before setting scan tool, turn the ignition key to the LOCK (OFF) position.
3. With the M/T vehicles, check that the shift lever is in the neutral position. With the TC-SST vehicle, check that the selector lever is in the "N" position. Then, start the engine of the vehicle.
4. When carrying out the actuator tests No. 01 to 04, perform the actuator tests using scan tool while depressing the brake pedal. When carrying out the actuator tests No.05 to 08, perform the actuator tests using scan tool without depressing the brake pedal. When carrying out the actuator tests, rotate the wheel by hands to confirm that the braking force changes.
NOTE:
^ While performing the actuator test, the ABS warning light flashes at a rate of 2 Hz.
^ When ASC-ECU is disabled due to the fail-safe function, the M.U.T. actuator test cannot be performed.
^ After the actuator test has been performed, the ABS warning light, brake warning light, ASC warning display, and ASC OFF indicator light illuminate until the ignition switch is turned to ON again or the communication between scan tool and ASC-ECU is terminated.
5. This is indicated as shown in the above.
6. When any malfunction has been found, take a necessary action according to the "Judgment Table."
7. After the inspection, turn the ignition switch to the LOCK (OFF) position, and then disconnect scan tool.