Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (see FREEZE FRAME DATA ).

1. READ OUTPUT DTC 
   1. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
   2. Connect the intelligent tester to the DLC3.
   3. Turn the tester ON.
   4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   5. Read DTC.

      Result 

      RESULT CHART
      
      

      Display (DTC output)	Proceed to
      P0190, P0192	A
      P0190, P0193	B

   B:  GO TO step  3

   A: GO TO Next Step 

2. INSPECT ECM (VC VOLTAGE) 
   1. Disconnect the E72 fuel pressure sensor connector.
   2. Turn the power switch ON (IG).
   3. Measure the voltage between the terminal of the fuel pressure sensor connector.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      VC (E72-3) - E2 (E72-1)	4.5 to 5.5 V

      Fig 1: Identifying E72 Fuel Pressure Sensor Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG:  GO TO step  4

   OK: GO TO Next Step 

3. INSPECT FUEL PRESSURE SENSOR 
   1. Inspect fuel pressure sensor (see INSPECTION ).

   NG: REPLACE FUEL PRESSURE SENSOR 

   OK: GO TO Next Step 

4. CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM) 
   1. Disconnect the E83 ECM connector.
   2. Disconnect the E72 fuel pressure sensor connector.
   3. Measure the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      VC (E83-125) - VC (E72-3)	Below 1 Ω
      PR (E83-115) - PR (E72-2)	Below 1 Ω
      E2 (E83-103) - E2 (E72-1)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      VC (E83-125) or VC (E72-3) - Body ground	10 kΩ or higher
      PR (E83-115) or PR (E72-2) - Body ground	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the fuel pressure sensor connector.
      Fig 2: Identifying E72 Fuel Pressure Sensor Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM