Hydraulic Unit Check

Required Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A

CAUTION:

The roller of the braking force tester and the tire should be dry during testing.
When testing the front brakes, apply the parking brake. When testing the rear brakes, stop the front wheels with chocks.

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.
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.
Connect scan tool MB991958 to the data link connector.

Fig 1: Connecting Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
After checking that the selector lever is in "P" range, start the engine.
Select "Interactive Diagnosis" from the start-up screen.
Select "System Select."
Choose "ABS/ASC/ASTC" from the "CHASSIS" tab.
Select "Actuator Test" from "ABS/ASC/ASTC" screen
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 indicator and TCL 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.

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 values shown in the following table, 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 following illustration.

Fig 2: Actuator Test Graph

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

BRAKING FORCE REFERENCE

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

If the result of inspection is abnormal, repair according to the Diagnosis Table shown in following illustration.

Fig 3: Identifying Hydraulic Unit Diagnostic Repair Procedures
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
After inspection, disconnect scan tool MB991958 immediately after turning the ignition switch to the "LOCK" (OFF) position.