Advanced Hydraulic Booster

Advanced Hydraulic Booster DTC Troubleshooting: 21, 22, 23

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 Service and Repair.�

NO -

Intermittent failure, the system is OK at this time. Check for loose terminals at the servo unit25P connector. Refer to intermittent failures troubleshooting.�