P0555
P0555 BRAKE BOOSTER PRESSURE SENSOR
Description
Brake booster pressure sensor is connected to brake booster by a hose. It detects brake booster pressure and sends the voltage signal to the ECM. The sensor uses a silicon diaphragm which is sensitive to the change in pressure. As the pressure increases, the voltage rises.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 10 seconds.
2. Check DTC.
Is DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END
Diagnosis Procedure
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connection.
2.CHECK BRAKE BOOSTER PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect brake booster pressure sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between brake booster pressure sensor harness connector and ground.
Is the inspection result normal?
YES - GO TO 9.
NO - GO TO 3.
3.CHECK BRAKE BOOSTER PRESSURE SENSOR POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between Brake booster pressure sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F1, E3
- Harness for open between ECM and brake booster pressure sensor
- Repair open circuit.
5.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES - GO TO 6.
NO - Repair short to ground or short to power in harness or connectors.
6.CHECK COMPONENTS
Check the following.
- Crankshaft position sensor (POS) ( P0335.)
- EVAP control system pressure sensor ( P0451.)
- Refrigerant pressure sensor ( Testing and Inspection.)
Is the inspection result normal?
YES - GO TO 7.
NO - Replace malfunctioning component.
7.CHECK APP SENSOR
P2122.
Is the inspection result normal?
YES - GO TO 14.
NO - GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Exploded View.
2. Go to P2122.
- INSPECTION END
9.CHECK BRAKE BOOSTER PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between brake booster pressure sensor harness connector and ECM harness connector.
4. Also check harness for short to ground and power.
Is the inspection result normal?
YES - GO TO 11.
NO - GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F1, E3
- Harness for open or short between brake booster pressure sensor and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
11.CHECK BRAKE BOOSTER PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between brake booster pressure sensor harness connector and ECM harness connector.
2. Also check harness for short to ground and power.
Is the inspection result normal?
YES - GO TO 13.
NO - GO TO 12.
12.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F1, E3
- Harness for open or short between brake booster pressure sensor and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
13.CHECK BRAKE BOOSTER PRESSURE SENSOR
SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 14.
NO - Replace brake booster pressure sensor. Removal And Installation.
14.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END
Component Inspection
1.CHECK BRAKE BOOSTER PRESSURE SENSOR-I
1. Turn ignition switch OFF.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
4. Check the voltage between ECM harness connector terminals as per the following.
NOTE:
- To avoid the influence of intake manifold vacuum, check the voltage 1 or more minutes past after engine is stopped.
- Because the sensor is absolute pressure sensor, output value may differ depends on atmospheric pressure and altitude.
5. Measure the atmospheric pressure.
NOTE:
As the atmospheric pressure described on the synoptic chart is the value at sea level, compensate the pressure with the following chart.
6. Check the manifold absolute pressure sensor value corresponding to the atmospheric pressure.
Is the inspection result normal?
YES - GO TO 2.
NO - Replace brake booster pressure sensor. Removal And Installation.
2.CHECK BRAKE BOOSTER PRESSURE SENSOR-II
1. Turn ignition switch OFF.
2. Remove brake booster pressure sensor with its harness connected.
3. Connect the hose of vacuum pump (A) to brake booster pressure sensor (1).
4. Turn ignition switch ON.
5. Check the voltage between ECM harness connector terminals as per the following.
6. Check that the difference of the voltage when engine is stopped and that when negative pressure is applied with vacuum pump is within the following limits.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace brake booster pressure sensor. Removal And Installation.