P15B6

DTC P15B6: Brake Fluid Pressure Sensor A/B Signal Malfunction

1. Turn the ignition switch ON (II).
2. Check the BRAKE FLUID PRESSURE SENSOR B with the HDS without pressing the brake pedal.

Is there between 0.26 V and 0.74 V?

YES - Go to step 11.

NO - Go to step 3.

3. Turn the ignition switch OFF.
4. Change connectors between brake fluid pressure sensor A and B.
5. Turn the ignition switch ON (II).
6. Check the BRAKE FLUID PRESSURE SENSOR B with the HDS without pressing the brake pedal.

Is there between 0.26 V and 0.74 V?

YES - Go to step 7.

NO - Replace brake fluid pressure sensor A.

7. Turn the ignition switch OFF.
8. Disconnect ECM connector C (31P).




9. Connect ECM connector terminal C18 to body ground with a jumper wire.




10. Check for continuity between brake fluid pressure sensor ASP connector terminal No.1 and body ground.

Is there continuity?

YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.

NO - Repair open in the wire between brake fluid pressure sensor A and the ECM (C18).

11. Check the BRAKE FLUID PRESSURE SENSOR B with the HDS without pressing the brake pedal.

Is there between 0.26 V and 0.74 V?

YES - Go to step 12.

NO - Go to step 17.

12. Clear the DTC with the HDS.
13. Start the engine.
14. Test-drive the vehicle twice at 3 mph (5 km/h) or more with the throttle position at 9 degrees, or more.
15. Stop the vehicle, press the brake pedal, and hold it 10 seconds.
16. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P15B6 indicated?

YES - Replace brake fluid pressure sensor A and B.

NO - The system is OK at this time. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

17. Turn the ignition switch OFF.
18. Change connectors between brake fluid pressure sensor A and B.
19. Turn the ignition switch ON (II).
20. Check the PBRKS1 with the HDS without pressing the brake pedal.

Is there between 0.26 V and 0.74 V?

YES - Go to step 21.

NO - Replace brake fluid pressure sensor B.

21. Turn the ignition switch OFF.
22. Disconnect ECM connector C (31P).




23. Connect ECM connector terminal C2 to body ground with a jumper wire.




24. Check for continuity between brake fluid pressure sensor B 3P connector terminal No.1 and body ground.

Is there continuity?

YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.

NO - Repair open in the wire between brake fluid pressure sensor B and the ECM (C2).