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.

1. CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SENSOR) 
   1. Disconnect the C53 ECM connector.
   2. Disconnect the C28 power steering oil pressure sensor connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      C28-2 (PSP) - C53-72 (PSP)	Always	Below 1 Ω
      C28-1 (VC) - C53-67 (VCV1)	Always	Below 1 Ω
      C28-3 (E2) - C53-97 (ETHW)	Always	Below 1 Ω
      C28-2 (PSP) or C53-72 (PSP) - Body ground	Always	10 kΩ or higher
      C28-1 (VC) or C53-67 (VCV1) - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 1: Identifying C53 ECM And C28 Power Steering Oil Pressure Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step. 

2. REPLACE POWER STEERING OIL PRESSURE SENSOR 
   1. Replace the power steering oil pressure sensor (See REMOVAL ).
3. CONFIRM WHETHER DTC OUTPUT RECURS 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG) and turn the Techstream on.
   3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   4. Read the DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      P0550, P0552 and/or P0553 are output	A
      No DTC is output	B

   B: END 

   A: REPLACE ECM  (See ECM )