Advanced Hydraulic Booster

DTC 21: PACC Sensor Malfunction

DTC 22: PREG Sensor Malfunction

DTC 23: PMC Sensor Malfunction

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. With the ignition switch in ON (II), press the brake pedal several times.
4. Check for DTCs with the HDS.

Is DTC 21, 22, or 23 indicated?

YES - Replace the servo unit.

NO - Intermittent failure, the system is OK at this time. Check for loose terminals at the servo unit 25P connector. Refer to intermittent failures troubleshooting.