P15BB

DTC P15BB: Brake Booster System Leak Detected

NOTE: If DTC P15BB is stored at the same time as DTC P0571, troubleshoot DTC P0571 first, then recheck for DTC P15BB.

1. Turn the ignition switch OFF.
2. Check for vacuum leaks or clogging at these parts:

- Brake booster pressure sensor hose.
- Brake booster vacuum hoses and their joints.
- Check valve (intake manifold).
- Check valve (vacuum pump) and filter.
- Brake booster.

Are the parts OK?

YES - Go to step 3.

NO - Repair or replace the leaking or clogged part(s).

3. Check the brake pedal position switch signal circuit.

Is the circuit OK?

YES - Intermittent failure, the system is OK at this time. Check for loose terminals between the brake pedal position switch 4P connector and PCM. connector A (44P). Refer to intermittent failures troubleshooting. General Troubleshooting Information

NO - Troubleshoot the brake pedal position switch signal circuit.