DTC P15B5: Brake Fluid Pressure Sensor B Range Performance Problem (2005-2006 M/T models)

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch ON (II).
Check BRAKE FLUID PRESSURE SENSOR B with the HDS without pressing the brake pedal.
Is there 2.45 MPa or more?
1. YES - Go to step 3.
2. NO - The system is OK at this time. Check for poor connections or loose terminals at brake fluid pressure sensor B and the ECM.
Turn the ignition switch OFF.
Disconnect the brake fluid pressure sensor B 3P connector.
Turn the ignition switch ON (II).
Measure voltage between brake fluid pressure sensor B 3P connector terminals No. 1 and No. 2.

Fig 1: Measuring Voltage Between Brake Fluid Pressure Sensor Connector Terminals No. 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5.0 V?
1. YES - Replace brake fluid pressure sensor B (see BRAKE FLUID PRESSURE SENSOR REPLACEMENT ).
2. NO - Go to step 7.
Turn the ignition switch OFF, and wait for 10 seconds.
Disconnect ECM connector C (31P).
Connect ECM connector terminal C2 to body ground with a jumper wire.

Fig 2: Connecting ECM Connector Terminal C2 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between brake fluid pressure sensor B 3P connector terminal No. 1 and body ground.

Fig 3: Checking Continuity Between Brake Fluid Pressure Sensor Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM (see ECM UPDATING AND SUBSTITUTION FOR TESTING-2002-2006 M/T MODELS AND CVT MODEL ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
2. NO - Repair open in the wire between brake fluid pressure sensor B and the ECM (C2).