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 a hand-held tester or OBD II scan tool. Freeze frame data record 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.

1. CHECK POWER STEERING OIL PRESSURE SENSOR 
   1. Connect a hand-held tester or OBD II scan tool to the DLC3.
   2. Turn the tester or scan tool ON.
   3. Start the engine.
   4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / PS SIGNAL.
   5. Read the value displayed on the tester.
   6. If using an OBD II scan tool, refer to the instruction manual .

      OK: 

      POWER STEERING OIL PRESSURE SENSOR CONDITION
      
      

      Conditions	Power steering oil pressure sensor
      Steering wheel lock	ON
      In an idle	OFF

   1. OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
   2. NG: Go to next step. 
2. CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SENSOR) 
   1. Disconnect the E5 and E6 ECM connectors.
   2. Disconnect the P1 power steering oil pressure sensor connector.
   3. Check the resistance.

      Standard (Check for open): 

      ECM - POWER STEERING OIL PRESSURE SENSOR (CHECK FOR OPEN)
      
      

      Specified Tester	Connections Conditions
      VOUT (P1-2) - PSP (E6-29)	Below 1 Ω
      VC (P1-3) - VC (E5-18)
      GND (P1-1) - E2 (E5-28)

      Standard (Check for short): 

      ECM - POWER STEERING OIL PRESSURE SENSOR (CHECK FOR SHORT)
      
      

      Tester Connections	Specified Conditions
      VOUT (P1-2) or PSP (E6-29) - Body ground	10 kΩ or higher
      GND (P1-1) or E2 (E5-28) - Body around

      Fig 1: Checking Harness And Connector (ECM - Power Steering Oil Pressure Sensor) (1 Of 2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Checking Harness And Connector (ECM - Power Steering Oil Pressure Sensor (2 Of 2)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the power steering oil pressure sensor connector.
   5. Reconnect the ECM connector.
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: REPLACE POWER STEERING OIL PRESSURE SENSOR