C1178

C1178, C1181, C1184, C1189 ABS ACTIVE BOOSTER





Description
The active brake booster consists of a vacuum booster, an active booster control group and a delta stroke sensor. If a brake booster system malfunction occurs due to loss of vacuum, the delta stroke sensor will signal the ABS actuator and electric unit (control unit) that a booster malfunction has occurred. The active booster then applies supplemental force to the master cylinder relative to the amount of force exerted on the brake pedal.

DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.






Is above displayed on the self-diagnosis display?
YES - Proceed to diagnosis procedure. C1178.
NO - Inspection End

Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Antilock Brakes / Traction Control Systems.
1.CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the active booster connector and ABS actuator and electric unit (control unit) connector and inspect the terminals for deformation, disconnection, looseness, or damage.
Is the inspection result normal?
YES - GO TO 2
NO - Repair connector.
2.ACTIVE BOOSTER CIRCUIT INSPECTION





1. Measure the continuity between ABS actuator and electric unit
(control unit) connector E125 (A) and active booster connector
E49 (B).






2. Measure the continuity between ABS actuator and electric unit (control unit) connector E125 (A) and body ground.






Is the inspection result normal?
YES - GO TO 3
NO - Repair or replace harness or connector.
3.ACTIVE BOOSTER INSPECTION
1. Reconnect the active booster and ABS actuator and electric unit (control unit) connectors.
2. Perform the active booster component inspection. C1178.
Is the inspection result normal?
YES - Replace the ABS actuator and electric unit (control unit). Service and Repair.
NO - Replace the active booster. Removal And Installation.

Component Inspection
1.CHECK DATA MONITOR
Use "DATA MONITOR" to check if the status of "RELEASE SWITCH NO" and "RELEASE SWITCH NC" is normal.






Is the inspection result normal?
YES - Inspection End
NO - Go to diagnosis procedure. C1178.

Special Repair Requirement
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator and electric unit (control unit). Description.
- GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit). Description.
- END