VC Output Circuit: Procedure

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

   OK

   MIL lights up

NG → See step   2 

OK → SYSTEM OK 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Check the communication between the Techstream and ECM.

   Result

   Result	Proceed to
   Communication is not possible	A
   Communication is possible	B

B → See step   7 

A: Go to next step 

1. Disconnect the throttle body connector.
2. Turn the ignition switch to ON.
3. Check the MIL.

   Result

   Result	Proceed to
   MIL does not illuminate	A
   MIL illuminates	B

4. Reconnect the throttle body connector.

B → See step   8 

A: Go to next step 

1. Disconnect the accelerator pedal position sensor connector.
2. Turn the ignition switch to ON.
3. Check the MIL.

   Result

   Result	Proceed to
   MIL does not illuminate	A
   MIL illuminates	B

4. Reconnect the accelerator pedal position sensor connector.

B → See step   9 

A: Go to next step 

1. Disconnect the canister pump module connector.
   Fig 1: Locating Canister Pump Module Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Check the MIL.

   Result

   Result	Proceed to
   MIL does not illuminate	A
   MIL illuminates (for 2WD)	B
   MIL illuminates (for 4WD)	C

4. Reconnect the canister pump module connector.

C → See step   12 

B → See step   10 

A: Go to next step 

1. Disconnect the throttle body connector.
2. Disconnect the accelerator pedal position sensor connector.
3. Disconnect the canister pump module connector.
4. Disconnect the ECM connectors.
   Fig 2: Identifying ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Measure the resistance.

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   B29-67 (VCTA) - Body ground	Always	10 kΩ or higher
   A37-57 (VCPA) - Body ground	Always	10 kΩ or higher
   A37-58 (VCP2) - Body ground	Always	10 kΩ or higher
   B29-70 (VCPP) - Body ground	Always	10 kΩ or higher

6. Reconnect the throttle body connector.
7. Reconnect the accelerator pedal position sensor connector.
8. Reconnect the canister pump module connector.
9. Reconnect the ECM connectors.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11