Hydraulic Unit Check

Required Special Tools: 

• MB991958: Scan Tool (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

1. Jack up the vehicle. Then support the vehicle with rigid racks at the specified jack-up points or place the front or rear wheels on the rollers of the braking force tester.
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.
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
3. Connect scan tool MB991958 to the data link connector.
4. After checking that the neutral position <M/T> or selector lever is in "P" range <A/T>, start the engine.
5. Select "System Select."
6. Choose "ABS/ASC/ASTC."
7. Select "Actuator Test" from "ABS/ASC/ASTC" screen
8. Choose an appropriate item for hydraulic unit check.
   NOTE: The TCL/ASC system will switch to the scan tool mode and the ABS warning light, TCL/ASC work indicator and ASC OFF indicator will illuminates.
   NOTE: When the ABS and TCL/ASC has been interrupted by the fail-safe function, scan tool MB991958 actuator testing cannot be used.
   Fig 1: Connecting Special Tool MB991910 To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Waveform Pattern

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. 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 that the braking force changes to the brake drag force reading taken in step  2 when the actuator is force-driven. The result should be as shown in the illustartion above.
   WHEEL BRAKING FORCE VALUES
   
   

   Front wheel	785 - 981 N (176 - 220 lb)
   Rear wheel	588 - 784 N (132 - 176 lb)

10. If the result of inspection is abnormal, repair according to the Diagnosis Table below.
    DIAGNOSIS CHART
    
    

    DIAGNOSIS TABLE
    SCAN TOOL M.U.T.-III DISPLAY	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 05 FL wheel TCL drive 06 FR wheel TCL drive 07 RL wheel TCL drive 08 RR wheel TCL drive	Depress brake pedal to lock wheel. Using scan tool MB991958, select the wheel to be checked and force the actuator to operate. Turn the selected wheel manually to check the change of brake force.	Brake force is released for three seconds after wheels have been locked.	Normal	-	-
    		Wheel does not lock when brake pedal is depressed.	Abnormal	Clogged brake line other than hydraulic unit	Check and clean brake line
    				Clogged hydraulic circuit in hydraulic unit	Replace hydraulic unit assembly
    		Brake force is not released		Incorrect hydraulic unit brake tube connection	Connect correctly
    				Hydraulic unit solenoid valve not functioning correctly	Replace hydraulic unit assembly

11. After inspection, disconnect scan tool MB991958 immediately after turning the ignition switch to the "LOCK" (OFF) position.