Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000001EY900HX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

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.

DTC No.

DTC Detection Condition

Trouble Area

P0550

Open or short in power steering oil pressure sensor circuit detected for more than 3 seconds after ignition switch turned to ON.

(1 trip detection logic)
  • Open or short in power steering oil pressure sensor circuit
  • Power steering oil pressure sensor
  • ECM

P0552

Open in power steering oil pressure sensor circuit detected for more than 3 seconds after ignition switch turned to ON.
  • Open in power steering oil pressure sensor circuit
  • Power steering oil pressure sensor
  • ECM

P0553

Short in power steering oil pressure sensor circuit detected for more than 3 seconds after ignition switch turned to ON.
  • Short in power steering oil pressure sensor circuit
  • Power steering oil pressure sensor
  • ECM

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 stores a DTC.

MONITOR STRATEGY

Related DTCs

P0550: Power steering pressure sensor range check (Chattering)

P0552: Power steering pressure sensor range check (Low Resistance)

P0553: Power steering pressure sensor range check (High Resistance)

Required sensors/components (Main)

Power steering pressure sensor

Frequency of operation

Continuous

Duration

0.5 seconds

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not present

None

Time after starter signal ON to OFF

2 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

P0550

Power steering pressure sensor voltage

Less than 0.28 V, or more than 4.9 V

P0552

Power steering pressure sensor voltage

Less than 0.28 V

P0553

Power steering pressure sensor voltage

More than 4.9 V

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 ECM connector.

(b) Disconnect the power steering oil pressure sensor connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D30-2 (PSP) - D56-72 (PSP)

Always

Below 1 Ω

D30-1 (VC) - D56-67 (VCV1)

Always

Below 1 Ω

D30-3 (E2) - D56-97 (ETHW)

Always

Below 1 Ω

D30-2 (PSP) or D56-72 (PSP) - Body ground

Always

10 kΩ or higher

D30-1 (VC) or D56-67 (VCV1) - Body ground

Always

10 kΩ or higher
OK

2.

REPLACE POWER STEERING OIL PRESSURE SWITCH

(a) Replace the power steering oil pressure sensor.

NEXT

3.

CONFIRM WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs.

Result

Result

Proceed to

P0550, P0552 and/or P0553 are output

A

No DTC is output

B
A