P15BB

DTC Troubleshooting: 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 to LOCK (0).

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 Brake Pedal Position Switch Signal Circuit Troubleshooting.

Is the circuit OK?

YES -

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

NO -

Troubleshoot the brake pedal position switch signal circuit P0571.