Toyota Tundra Service Manual: Power Steering Pressure Sensor Circuit (P0550,P0552,P0553)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Power Steering Pressure Sensor Circuit (P0550,P0552,P0553)

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

Power steering oil pressure sensor voltage less than 0.28 V, or more than 4.9 V for 0.5 seconds while engine running.

(1 trip detection logic)

  • Open or short in power steering oil pressure sensor circuit
  • Power steering oil pressure sensor
  • ECM

P0552

Power steering oil pressure sensor voltage less than 0.28 V for 0.5 seconds while engine running.

(1 trip detection logic)

  • Open or short in power steering oil pressure sensor circuit
  • Power steering oil pressure sensor
  • ECM

P0553

Power steering oil pressure sensor voltage more than 4.9 V for 0.5 seconds while engine running.

(1 trip detection logic)

  • Open or short in power steering oil pressure sensor circuit
  • Power steering oil pressure sensor
  • ECM

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to regulate 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 oil 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

Starter

OFF

Time after starter signal ON to OFF

2 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

P0550

Power steering oil pressure sensor voltage

Less than 0.28 V, or more than 4.9 V

P0552

Power steering oil pressure sensor voltage

Less than 0.28 V

P0553

Power steering oil pressure sensor voltage

More than 4.9 V

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Idle the engine for 5 seconds [A].
  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
  9. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P0550, P0552 or P0553.
  12. Check the DTC judgment result.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    If the judgment result shows INCOMPLETE or N/A, perform steps [A] through [B] again.

  13. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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

D46-2 (PSP) - D74-72 (PSP)

Always

Below 1 Ω

D46-1 (VC) - D74-67 (VCV1)

Always

Below 1 Ω

D46-3 (E2) - D74-98 (E2)

Always

Below 1 Ω

D46-2 (PSP) or D74-72 (PSP) - Body ground

Always

10 kΩ or higher

D46-1 (VC) or D74-67 (VCV1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF POWER STEERING OIL PRESSURE SENSOR)

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

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D46-2 (PSP) - D46-3 (E2)

Ignition switch ON

4.5 to 5.5 V

NG

REPLACE ECM

OK

3.

REPLACE POWER STEERING OIL PRESSURE SENSOR

(a) Replace the power steering oil pressure sensor (See page ).

NEXT

4.

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) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

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

(f) Confirm that the DTC is not output

NEXT

END

    Idle Control System (P0505)

    System Voltage (P0560)

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