VC Output Circuit: Procedure

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

   Standard

   MIL lights up

OK → SYSTEM OK 

NG: Go to next step 

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

   Result

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

A → See step   8 

B: Go to next step 

1. Turn the ignition switch to the ON position.
   Fig 1: Identifying E1 And VC Terminal Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   E8-18 (VC) - E8-3 (E1)	Voltage is not 5 V

NEXT: Go to next step 

1. Disconnect the T1 throttle body connector.
2. Turn the ignition switch to the ON position.
3. Check the MIL.

   Result

   Condition	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the throttle body connector.

A → See step   9 

B: Go to next step 

1. Disconnect the L1 canister pump module connector.
2. Turn the ignition switch to the ON position.
3. Check the MIL.

   Result

   Condition	Proceed to
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the canister pump module connector.

A → See step   10 

B: Go to next step 

1. Disconnect the T1 throttle body connector.
2. Disconnect the L1 canister pump module connector.
3. Disconnect the E8 ECM connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   E8-18 (VC) - Body ground	10 kΩ or higher

5. Reconnect the throttle body connector.
6. Reconnect the canister pump module connector.
7. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7