VC Output Circuit: Procedure

1. Check that the MIL lights up when turning the ignition switch ON.

   OK

   MIL lights up

OK → SYSTEM OK 

NG: Go to next step 

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

   Result

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

B → GO TO MIL CIRCUIT 

A: Go to next step 

Fig 1: Checking ECM (VC Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch ON.
2. Measure the voltage of the ECM connector.

   Result

   Voltage is not 5 V

NEXT: Go to next step 

1. Disconnect the T26 throttle body connector.
2. Turn the ignition switch ON.
3. Check the MIL.

   Result

   Condition	Proceed to
   MIL does not illuminate	A
   MIL illuminates	B

B → REPLACE THROTTLE BODY ASSEMBLY 

A: Go to next step 

1. Disconnect the C12 canister pump module connector.
2. Turn the ignition switch ON.
3. Check the MIL.

   Result

   Condition	Proceed to
   MIL does not illuminate	A
   MIL illuminates	B

B → REPLACE CANISTER 

A: Go to next step 

Fig 2: Checking Wire Harness (ECM - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the T26 throttle body connector.
2. Disconnect the C12 canister pump module connector.
3. Disconnect the E2 ECM connector.
4. Measure the resistance of the wire harness connector.

   Standard resistance

   Tester Connection	Specified Condition
   E2-29 (VC) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK → REPLACE ECM