System Check Sound
When starting the engine and moving the vehicle for the first time after startup, a thudding sound can sometimes be heard coming from the engine compartment. This is a normal sound during the ABS and TCL unit self-check.
DATA LIST REFERENCE TABLE
The following items can be read by the scan tool from the ABS-ECU input data.
Scheme 136
BLEEDING
| CAUTION | Use the specified brake fluid. Don't use a mixture of the specified brake fluid and another non-specified fluid. |
Specified brake fluid: Conforming to DOT 3 or DOT 4
MASTER CYLINDER BLEEDING
Refer to BLEEDING BRAKE SYSTEM .
BRAKE LINE BLEEDING
| CAUTION | Be sure to filter/strain the brake fluid being added to the master cylinder reservoir tank. Debris may damage the hydraulic unit. |
Refer to BLEEDING BRAKE SYSTEM .
WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT
Refer to WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT .
HYDRAULIC UNIT CHECK
Required Special Tool
- MB991502: Scan Tool (MUT-II)
| 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. |
Scheme 137
Scheme 138
- 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 MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool.
- Turn the ignition switch to the "LOCK" (OFF) position and set scan tool MB991502 as shown in the illustration.
- After checking that the selector lever < A/T > or the shift lever < M/T > is in neutral, start the engine.
- Use scan tool MB991502 to force-drive the actuator. NOTE: The TCL system will switch to the scan tool mode and the ABS warning light will illuminate. NOTE: When the TCL has been interrupted by the fail-safe function, scan tool MB991502 actuator testing cannot be used.
- Turn the wheel by hand and check the change in braking force. Use a braking force tester. The braking force reading value should change when the actuator test is carried out. The result should be as shown in the diagram above.
- If the result of inspection is abnormal, replace the hydraulic unit. (Refer to «HYDRAULIC UNIT»(ref-171332-S04371458382005020200000) ).