Inspection Procedure

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 

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

   Result 

   CONNECTION BETWEEN INTELLIGENT TESTER AND ECM
   
   

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

A: GO TO  MIL CIRCUIT  

B: GO TO NEXT STEP 

1. Disconnect the T2 throttle body connector.
2. Turn the ignition switch to ON.
3. Check the MIL.

   Result 

   MIL (THROTTLE POSITION SENSOR)
   
   

   Result	Proceed To
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the throttle body connector.

A: REPLACE THROTTLE BODY ASSEMBLY 

B: GO TO NEXT STEP 

1. Disconnect the A15 accelerator pedal position sensor connector.
2. Turn the ignition switch to ON.
3. Check the MIL.

   Result 

   MIL (ACCELERATOR PEDAL POSITION SENSOR)
   
   

   Result	Proceed To
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the accelerator pedal position sensor connector.

A: REPLACE ACCELERATOR PEDAL POSITION SENSOR 

B: GO TO NEXT STEP 

1. Disconnect the V9 vapor pressure sensor connector.
2. Turn the ignition switch to ON.
3. Check the MIL.

   Result 

   MIL (VAPOR PRESSURE SENSOR)
   
   

   Result	Proceed To
   MIL illuminates	A
   MIL does not illuminate	B

4. Reconnect the vapor pressure sensor connector.

A: REPLACE VAPOR PRESSURE SENSOR 

B: GO TO NEXT STEP 

1. Disconnect the T2 throttle body connector.
2. Disconnect the A15 accelerator pedal position sensor connector.
3. Disconnect the V9 vapor pressure sensor connector.
4. Disconnect the E4 and E8 ECM connectors.
5. Check the resistance.

   Standard resistance (check for short) 

   HARNESS AND CONNECTOR
   
   

   Tester Connections	Specified Conditions
   VC (E8-18) - Body ground	10 kΩ or higher
   VCPA (E4-26) - Body ground
   VCP2 (E4-27) - Body ground

   Fig 1: Checking Harness And Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Reconnect the throttle body connector.
7. Reconnect the accelerator pedal position sensor connector.
8. Reconnect the vapor pressure sensor connector.
9. Reconnect the ECM connectors.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM