VC Output Circuit: Wiring Diagram

Refer to the following pages.

• Throttle position sensor circuit (See DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION  ).
• Canister pump module circuit (See WIRING DIAGRAM  ).
• Secondary air injection pressure sensor circuit (See DTC P0418 SECONDARY AIR INJECTION SYSTEM CONTROL "A" CIRCUIT  ).
• Camshaft position sensor circuit (See DTC P1340 CAMSHAFT POSITION SENSOR "A" (BANK 1 SENSOR 2); DTC P1341 CAMSHAFT POSITION SENSOR "A" (BANK 1 SENSOR 2)  ).

1. CHECK MIL 
   1. Check that Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch ON.

      OK: MIL lights up 

   OK: SYSTEM OK 

   NG: GO TO NEXT STEP. 

2. CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM 
   1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
   2. Turn the ignition switch ON and intelligent tester ON.
   3. Check the communication between the intelligent tester and ECM.

      Result 

      RESULT
      
      

      Condition	Proceed to
      Communication is possible	A
      Communication is impossible	B

   A: GO TO  MIL CIRCUIT  

   B: GO TO NEXT STEP. 

3. INSPECT ECM 
   1. Turn the ignition switch ON.
   2. Measure the voltage between E8-23 (VC) and E6-1 (E1) of the ECM connectors.

      Standard voltage: Voltage is not 5 V 

      Fig 1: Identifying Terminals Of ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. CHECK MIL (THROTTLE POSITION SENSOR) 
   1. Disconnect the T14 throttle body connector.
   2. Turn the ignition switch ON.
   3. Check the MIL.

      Result 

      RESULT
      
      

      Condition	Proceed to
      MIL illuminates	A
      MIL does not illuminate	B

   A: REPLACE THROTTLE BODY 

   B: GO TO NEXT STEP. 

5. CHECK MIL (CAMSHAFT POSITION SENSOR) 
   1. Disconnect the C1 camshaft position sensor connector.
   2. Turn the ignition switch ON.
   3. Check the MIL.

      Result 

      RESULT
      
      

      Condition	Proceed to
      MIL illuminates	A
      MIL does not illuminate	B

   A: REPLACE CAMSHAFT POSITION SENSOR 

   B: GO TO NEXT STEP. 

6. CHECK MIL (CANISTER PUMP MODULE) 
   1. Remove the spare tire.
   2. Disconnect the L5 canister pump module connector.
   3. Turn the ignition switch ON.
   4. Check the MIL.
      Fig 2: Disconnecting L5 Canister Pump Module Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT
      
      

      Condition	Proceed to
      MIL illuminates	A
      MIL does not illuminate	B

   A: REPLACE CANISTER 

   B: GO TO NEXT STEP. 

7. CHECK MIL (PRESSURE SENSOR) 
   1. Remove the intake manifold (see COMPONENTS ).
   2. Disconnect the A42 pressure sensor.
   3. Turn the ignition switch ON.
   4. Check the MIL.

      Result 

      RESULT
      
      

      Condition	Proceed to
      MIL illuminates	A
      MIL does not illuminate	B

   A: REPLACE AIR SWITCHING VLVE 

   B: GO TO NEXT STEP. 

8. CHECK HARNESS AND CONNECTOR 
   1. Disconnect the T14 throttle body connector.
   2. Disconnect the C1 camshaft position sensor connector.
   3. Disconnect the L5 canister pump module connector.
   4. Disconnect the A42 pressure sensor.
   5. Disconnect the E8 ECM connector.
   6. Measure the resistance of the wire harness side connector.

      Standard resistance (check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      VC (E8-23) - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 3: Disconnecting E8 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM