P0550

P0550 PSP SENSOR





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 at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Proceed to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY-I
1. Disconnect power steering pressure (PSP) sensor connector.
2. Turn ignition switch ON.
3. Check the voltage between PSP sensor harness connector terminals.





Inspection result normal?
YES - GO TO 6.
NO - GO TO 2.
2.CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY-II
Check the voltage between PSP sensor harness connector and the ground.





Is inspection result normal?
YES - GO TO 4.
NO - GO TO 3.
3.CHECK SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness connector for short to power and short to ground, between the following terminals.





Is inspection result normal?
YES - Perform the trouble diagnosis for power supply circuit. Power Supply And Ground Circuit.
NO - Repair or replace error-detected parts.
4.CHECK PSP SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between PSP sensor harness connector and ECM harness connector.





Is inspection result normal?
YES - GO TO 5.
NO - Repair or replace error-detected parts.
5.CHECK ECM GROUND CIRCUIT
Check the continuity between ECM harness connector and ground.





Is inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Repair or replace error-detected parts.
6.CHECK PSP SENSOR SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between PSP sensor harness connector and ECM harness connector.





4. Also check harness for short to ground and to power.
Is inspection result normal?
YES - GO TO 7.
NO - Repair or replace error-detected parts.
7.CHECK PSP SENSOR
SEE Component Inspection (Power Steering Pressure Sensor).
Is inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Repair or replace error-detected parts.




Component Inspection (Power Steering Pressure Sensor)
1.CHECK POWER STEERING PRESSURE SENSOR
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Start engine and let it idle.
4. Check the voltage between ECM harness connector terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace power steering pressure sensor.