HYDRAULIC UNIT CHECK


1.Raise the vehicle using a jack and support the specified points with a rigid rack.
2.
caution Before connecting or disconnecting M.U.T.-III, always turn the ignition switch to the "LOCK" (OFF) position.
Before setting M.U.T.-III, 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 A-M/T 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 M.U.T.-III while depressing the brake pedal. When carrying out the actuator tests No.05 to 08, perform the actuator tests using M.U.T.-III 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 lamp flashes at a rate of 3 Hz.
  • When TCL/ASC-ECU is disabled due to the fail-safe function, the M.U.T.-III actuator test cannot be performed.
  • After the actuator test has been performed, the ABS warning lamp, brake warning lamp until the ignition switch is turned to "ON" again or the communication between M.U.T.-III and TCL/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."
Display on M.U.T.-III
 Operation
 Inspection result
 Judgment
 Probable cause
 Remedy
01 FL wheel ABS drive
02 FR wheel ABS drive
03 RL wheel ABS drive
04 RR wheel ABS drive
  • Depress the brake pedal to lock the vehicle.
  • Select the vehicle to be inspected using M.U.T.-III, perform the actuator test.
  • Rotate the selected wheel by hands to confirm the braking force.

 Braking force decreases for 3 seconds from the lock status.
 Normal
 -
 -
The wheel does not lock even if the brake pedal is depressed.
 Error
 Clogged brake line other than hydraulic unit
 Check and clean the brake line.
Clogged hydraulic circuit in the hydraulic unit
 Replace the hydraulic unit assembly.
Braking force does not decrease.
 Faulty routing of hydraulic unit brake tube
 Route the brake tube correctly.
Malfunction of hydraulic unit solenoid valve operation
 Replace the hydraulic unit assembly.
05 FL wheel TCL drive
06 FR wheel TCL drive
07 RL wheel TCL drive
08 RR wheel TCL drive
  • Select the vehicle to be inspected using M.U.T.-III, perform the actuator test.
  • Rotate the selected wheel by hands to confirm the braking force.

 Lock condition occurs for 3 seconds from the status without braking force.
 Normal
 -
 -
The wheel does not lock.
 Error
  • Faulty routing of hydraulic unit brake tube
  • Clogged brake line other than hydraulic unit

 Check and clean the brake line.
Clogged hydraulic circuit in the hydraulic unit
 Replace the hydraulic unit assembly.
7.After the inspection, turn the ignition switch to the "LOCK" (OFF) position, and then disconnect M.U.T.-III.