P15B9

DTC P15B9: Check Valve (Intake Manifold) Leak Detected

1. Turn the ignition, switch OFF.
2. Check for vacuum leaks at the check valve (intake manifold) between the brake booster and the intake manifold.

Is the check valve OK?

YES-Go to step 3.

NO-Replace the brake booster vacuum hose. (The check valve is inside the hose).

3. Disconnect the vacuum hose from the brake booster.
4. Turn the ignition switch ON (II).
5. Check the BRAKE BOOSTER PRESSURE SENSOR, and BARO SENSOR in the DATA LIST with the HDS, then compare the two pressure values.

Is the BRAKE BOOSTER PRESSURE SENSOR 8.67 kPa (2.56 in.Hg, 65 mmHg), more than the BARO SENSOR?

YES-Replace the brake booster pressure sensor

NO-Intermittent failure, the system is OK at this time.