DTC 21

DTC 21: PACC Sensor Malfunction
DTC 22: PREG Sensor Malfunction
DTC 23: PMC Sensor Malfunction
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. With the ignition switch 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 poor connections or loose terminals at the servo unit.