P0555

DTC P0555: Brake Booster Pressure Sensor Circuit Malfunction

1. Turn the ignition switch ON (II).
2. Check the BRAKE BOOSTER PRESSURE SENSOR in the DATA LIST with the HDS.

Is it between 0.19 and 4.8 V?

YES - Intermittent failure, the system is OK at this time. Check for loose terminals between the brake booster pressure sensor 3P connector, and PCM connector A (44P)/B (44P). Refer to intermittent failures troubleshooting. General Troubleshooting Information

NO - If 0.19 V or less is indicated, go to step 3. If 4.8 V or more is indicated, go to step 13.

3. Turn the ignition switch OFF.
4. Disconnect the brake booster pressure sensor 3P connector.
5. Turn the ignition switch ON (II).
6. Check the BRAKE BOOSTER PRESSURE SENSOR in the DATA LIST with the HDS.

Is 0.19 V or less indicated?

YES - Go to step 7.

NO - Go to step 11.

7. Turn the ignition switch OFF.
8. Short the SCS line with the HDS.
9. Disconnect PCM connector B (44P).
10. Check for continuity between body ground and brake booster pressure sensor 3P connector terminal No. 2.





Is there continuity?

YES - Repair short to body ground in the wire between the brake booster pressure sensor and the PCM.

NO - Check for loose terminals in the brake booster pressure sensor 3P connector and PCM connector A (44P)/B (44P), then update the PCM if it does not have the latest software, or substitute a known-good PCM. then go to step 1 and recheck. If no DTCs are indicated, and the PCM. was substituted, replace the original PCM.

11. Measure voltage between brake booster pressure sensor 3P connector terminals No. 1 and No. 3.





Is thereabout 5 V?

YES - Replace the brake booster pressure sensor.

NO - Go to step 12.

12. Measure voltage between body ground and brake booster pressure sensor 3P connector terminal No. 1.





Is there 0.1 V or less?

YES - Repair open in the wire between the brake booster pressure sensor and the PCM.

NO - Check for loose terminals in the brake booster pressure sensor 3P connector and PCM connector A (44P)/B (44P), then update the PCM if it does not have the latest software, or substitute a known-good PCM, then go to step 1 and recheck. If no DTCs are indicated, and the PCM was substituted, replace the original PCM.

13. Turn the ignition switch OFF.
14. Disconnect the brake booster pressure sensor 3P connector.
15. Connect brake booster pressure sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.





16. Turn the ignition switch ON (II).
17. Check the BRAKE BOOSTER PRESSURE SENSOR in the DATA LIST with the HDS.

Is 4.8 V or more indicated?

YES - Go to step 18.

NO - Replace the brake booster pressure sensor.

18. Disconnect the jumper wire from the brake booster pressure sensor.
19. Measure voltage between body ground and brake booster pressure sensor 3P connector terminal No. 2.





Is there about 5 V?

YES - Repair open in the wire (SG6 line) between the brake booster pressure sensor and the PCM.

NO - Go to step 20.

20. Turn the ignition switch OFF.
21. Short the SCS line with the HDS.
22. Disconnect PCM connector B (44P).
23. Check for continuity between brake booster pressure sensor 3P connector terminal No. 2 and PCM connector B (44P) terminal No. 5.





Is there continuity?

YES - Check for loose terminals in the brake booster pressure sensor 3P connector and PCM connector A (44P)/B (44P), then update the PCM if it does not have the latest software, or substitute a known-good PCM, then go to step 1 and recheck. If no DTCs are indicated, and the PCM was substituted, replace the original PCM.

NO - Repair open in the wire between the brake booster pressure sensor and the PCM.