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P15C3




DTC Troubleshooting: P15C3, P15C3

DTC P15C3:

Brake Booster Pressure Sensor A/B Voltage Incorrect Correlation

Special Tools Required

- Vacuum/Pressure Gauge, 0-4 inHg 07JAZ-001000B

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

Are there DTC(s) indicated in the PGM-FI system?

YES -

Go to the indicated DTC's troubleshooting.

NO -

Go to step 3.

3. Clear the DTC with the HDS.

4. Turn the ignition switch to LOCK (0).

5. Turn the ignition switch to ON (II).

6. Check for DTCs with the HDS.

Is DTC P15C3 indicated?

YES -

Go to step 7.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at brake booster pressure sensors and the ECM/PCM.

7. Start the engine. Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in Neutral) until the radiator fan comes on, then let it idle.

8. Turn the ignition switch to LOCK (0).

9. Turn the ignition switch to ON (II).

10. Press the brake pedal several times to deplete the vacuum with monitoring BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B 0.1 V or less?

YES -

Repair a short in the wire between brake booster pressure sensor A and brake booster pressure sensor B.

NO -

Go to step 11.

11. Check BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B 6 kPa (50 mmHg, 1.8 inHg) or less?

YES -

Go to step 14.

NO -

Go to step 12.

12. Check BRAKE BOOSTER PRESSURE SENSOR A and MAP SENSOR in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR A and MAP SENSOR 6 kPa (50 mmHg, 1.8 inHg) or less?

YES -

Go to step 13.

NO -

Go to step 20.

13. Check BRAKE BOOSTER PRESSURE SENSOR B and MAP SENSOR in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR B and MAP SENSOR 6 kPa (50 mmHg, 1.8 inHg) or less?

YES -

Compare value of MAP SENSOR with the value of BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B, then check the sensor which has a larger difference in the value.

- Brake booster pressure sensor A: Go to step 20.
- Brake booster pressure sensor B: Go to step 23.

NO -

Go to step 23.

14. Press the brake pedal several times to deplete the vacuum.

15. Start the engine. Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in Neutral) until the radiator fan comes on, then let it idle.

16. With light pedal force, press the brake pedal several times slowly.

17. Check BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE B in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B 6 kPa(50 mmHg, 1.8 inHg) or less?

YES -

Go to step 26.

NO -

Go to step 18.

18. Check BRAKE BOOSTER PRESSURE SENSOR A and MAP SENSOR in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR A and MAP SENSOR 6 kPa(50 mmHg, 1.8 inHg) or less?

YES -

Go to step 19.

NO -

Go to step 20.

19. Check BRAKE BOOSTER PRESSURE SENSOR B and MAP SENSOR in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR B and MAP SENSOR 6 kPa(50 mmHg, 1.8 inHg) or less?

YES -

Compare value of MAP SENSOR with the value of BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B, then check the sensor which has a larger difference in the value.

- BRAKE BOOSTER PRESSURE SENSOR A: Go to step 20.
- BRAKE BOOSTER PRESSURE SENSOR B: Go to step 23.

NO -

Go to step 23.

20. Turn the ignition switch to LOCK (0).

21. Disconnect the vacuum hose from brake booster pressure sensor A.

22. Start the engine, then check for vacuum at the vacuum hose.

Is there vacuum?

YES -

Replace brake booster pressure sensor A Brake Booster Pressure Sensor A Replacement.

NO -

Repair the clogged hose which connects brake booster pressure sensor A to the brake vacuum hose.

23. Turn the ignition switch to LOCK (0).

24. Disconnect the vacuum hose from brake booster pressure sensor B.

25. Start the engine, then check for vacuum at the vacuum hose.

Is there vacuum?

YES -

Replace brake booster pressure sensor B Brake Booster Pressure Sensor B Replacement.

NO -

Repair the clogged hose which connects brake booster pressure sensor B to the brake vacuum hose.

26. Clear the DTC with the HDS.

27. Turn the ignition switch to LOCK (0).

28. Turn the ignition switch to ON (II).

29. Press the brake pedal several times to deplete the vacuum.

30. Check for DTCs with the HDS.

Is DTC P15C3 indicated?

YES -

Go to step 31.

NO -

Check for poor connections or loose terminals at brake booster pressure sensor A, brake booster pressure sensor B, and the ECM/PCM.

31. Check BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE B in the EVPS DATA LIST with the HDS.

32. Install the vacuum/pressure gauge (A) and a suitable hose (B) between the brake booster and the vacuum hose (C).






33. Start the engine. Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in Neutral) until the radiator fan comes on, then let it idle.

34. Turn the ignition switch to LOCK (0).

35. Turn the ignition switch to ON (II).

36. Set the value of BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B to the values in the freeze data with pressing the brake pedal several times with low treading strength.

37. Check BRAKE BOOSTER PRESSURE SENSOR A in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR A and the value of vacuum/pressure gauge 6 kPa(50 mmHg, 1.8 inHg) or less?

YES -

Go to step 38.

NO -

Replace brake booster pressure sensor A Brake Booster Pressure Sensor A Replacement.

38. Check BRAKE BOOSTER PRESSURE SENSOR B in the EVPS DATA LIST with the HDS.

Is the difference between BRAKE BOOSTER PRESSURE SENSOR B and the value of vacuum/pressure gauge 6 kPa(50 mmHg, 1.8 inHg) or less?

YES -

Compare the value of the vacuum/pressure gauge with the value of BRAKE BOOSTER PRESSURE SENSOR A and BRAKE BOOSTER PRESSURE SENSOR B in the recorded data in the freeze data. Do this process a few times, then replace brake booster pressure sensor A Brake Booster Pressure Sensor A Replacement or brake booster pressure sensor B Brake Booster Pressure Sensor B Replacement, which ever has the larger difference in the value.

NO -

Replace brake booster pressure sensor B Brake Booster Pressure Sensor B Replacement.

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