P0552

2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0550: Power Steering Pressure Sensor Circuit Malfunction

DTC P0550 - Power Steering Pressure Sensor Circuit Malfunction

DTC P0552 - Power Steering Pressure Sensor Circuit Low Input

DTC P0553 - Power Steering Pressure Sensor Circuit High Input

DESCRIPTION

The power steering oil pressure sensor is turned ON when a power steering wheel load occurs by turning the steering wheel. The ECM regulates the engine idling RPM according to the voltage output of the sensor.






WIRING DIAGRAM





MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to regulates the engine idling speed. When the sensor output voltage deviates from the normal operating range, the ECM determines that there is a malfunction in the power steering oil pressure sensor and sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

P0550:





P0552:





P0553:





INSPECTION PROCEDURE
HINT:
- If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SENSOR)




(a) Disconnect the D74 ECM connector.
(b) Disconnect the D46 power steering oil pressure sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. REPLACE POWER STEERING OIL PRESSURE SENSOR
(a) Replace the power steering oil pressure sensor.
NEXT -- Continue to next step.
3. CONFIRM WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read the DTCs.

Result





B -- END
A -- REPLACE ECM