P15B2
DTC P15B2: Brake Fluid Pressure Sensor A Signal Low Voltage1. Turn the ignition switch ON (II).
2. Check the BRAKE FLUID PRESSURE SENSOR A with the HDS.
Is there 0.08 V or less?
YES - Go to step 3.
NO - The system is OK at this time. Check for poor connections or loose terminals at brake fluid pressure sensor A and the ECM.
3. Turn the ignition switch OFF.
4. Disconnect the brake fluid pressure sensor A 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between brake fluid pressure sensor A 3P connector terminals No.1 and No.2.
Is there about 5.0 V?
YES - Go to step 11.
NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Disconnect ECM connector C (31P).
9. Connect ECM connector terminal C28 to body ground with a jumper wire.
10. Check for continuity between brake fluid pressure sensor A 3P connector terminal No.2 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 the ECM (C28) and brake fluid pressure sensor A.
11. Turn the ignition switch OFF.
12. Disconnect ECM connector A (32P).
13. Check for continuity between brake fluid pressure sensor A 3P connector terminal No.3 and body ground.
Is there continuity?
YES - Repair short to ground between the ECM (A5) and brake fluid pressure sensor A.
NO - Go to step 14.
14. Connect ECM connector terminals A5 to body ground with a jumper wire.
15. Check for continuity between brake fluid pressure sensor A 3P connector terminal No.3 and body ground.
Is there continuity?
YES - Go to step 16.
NO - Repair open in the wire between the ECM (A5) and brake fluid pressure sensor A.
16. Connect ECM connector A (32P).
17. Connect brake fluid pressure sensor A 3P connector terminals No.2 and No.3 with a jumper wire.
18. Turn the ignition switch ON (II).
19. Check the BRAKE FLUID PRESSURE SENSOR A with the HDS.
Is there 0.08 V or less?
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 - Replace brake fluid pressure sensor A.