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P15C3




DTC Troubleshooting: 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 any 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 PCM.

7. Check for DTCs with the HDS.

Is DTC P0555, P0557, P15C1, or P15C2 indicated?

YES -

Go to the troubleshooting DTC P0555 P0555, P0557 P0557, P15C1 P15C1 or P15C2 P15C2.

NO -

Go to step 8.

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

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

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

11. Press the brake pedal several times to deplete the vacuum while 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 12.

12. 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 (1.8 inHg, 45 mmHg) or less?

YES -

Go to step 15.

NO -

Go to step 13.

13. 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 (1.8 inHg, 45 mmHg) or less?

YES -

Go to step 14.

NO -

Go to step 21.

14. 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 (1.8 inHg, 45 mmHg) or less?

YES -

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

- Brake booster pressure sensor A : Go to step 21.
- Brake booster pressure sensor B : Go to step 24.

NO -

Go to step 24.

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

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

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

18. 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 (1.8 inHg, 45 mmHg) or less?

YES -

Go to step 27.

NO -

Go to step 19.

19. 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 (1.8 inHg, 45 mmHg) or less?

YES -

Go to step 20.

NO -

Go to step 21.

20. 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 (1.8 inHg, 45 mmHg) or less?

YES -

Compare the value of the 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 21.
- BRAKE BOOSTER PRESSURE SENSOR B : Go to step 24.

NO -

Go to step 24.

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

22. Disconnect the vacuum hose from brake booster pressure sensor A Brake Booster Pressure Sensor A Replacement.

23. 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.

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

25. Disconnect the vacuum hose from brake booster pressure sensor B Brake Booster Pressure Sensor B Replacement.

26. 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.

27. Clear the DTC with the HDS.

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

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

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

31. Check for DTCs with the HDS.

Is DTC P15C3 indicated?

YES -

Go to step 32.

NO -

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

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

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






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

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

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

37. 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.

38. 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 gauge 6 kPa (1.8 inHg, 45 mmHg) or less?

YES -

Go to step 39.

NO -

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

39. 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 (1.8 inHg, 45 mmHg) 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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