Inspection Procedure

HINT:

• If different DTCs that are related to a different system are output simultaneously while terminal EIA1 is used as a ground terminal, terminal EIA1 may be open.
• Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE TCV) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON and turn the Techstream on.
   3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the IAC Duty Ratio / All Data / IAC Sensor Voltage.
   4. Check the output voltage of IAC Sensor Voltage while changing Control the IAC Duty Ratio from -100 to 100% (or from 100 to -100%) using the Techstream.

      OK: The voltage output of IAC Sensor Voltage remains between 0.2 and 4.8 V while Control the IAC Duty Ratio is changed from -100 to 100% (or from 100 to -100%). 

      HINT: 

      IAC SENSOR VOLTAGE CHART
      
      

      Control the IAC Duty Ratio operation	IAC Sensor Voltage (Normal)	Suspected Failure Area
      		IAC1 circuit shorted VCIA circuit open	VCIA and IAC1 circuit short-circuited IAC1 circuit open EIA1 circuit open	Sensor malfunction
      -100%	0.2 to 1.0 V	Remain below 0.2 V	Remain higher than 4.8 V	Other than the voltage in the 2 columns on the left
      100%	3.2 to 4.8 V	Remain below 0.2 V	Remain higher than 4.8 V

      NG: Go to step  3

      OK: Go to Next Step 

2. CHECK WHETHER DTC OUTPUT RECURS (DTC P2014, P2016 AND/OR P2017 ARE OUTPUT AGAIN) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON and turn the Techstream on.
   3. Clear DTCs (See DTC CHECK / CLEAR ).
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   5. Read DTCs.

      Result 

      RESULT CHART
      
      

      Display (DTC Output)	Proceed to
      P2014, P2016 and/or P2017 are output again	A
      No output	B

      B: SYSTEM OK 

      A: REPLACE ECM  (See REMOVAL )

3. CHECK HARNESS AND CONNECTOR (TCV POSITION SENSOR - ECM) 
   1. Disconnect the ECM connector.
   2. Disconnect the intake air control valve actuator connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      B30-72 (VCIA) - R4-3 (VDD)	Always	Below 1 Ω
      B30-70 (IAC1) - R4-1 (OUT)	Always	Below 1 Ω
      B30-71 (EIA1) - R4-2 (GND)	Always	Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      B30-72 (VCIA) or R4-3 (VDD) - Body ground	Always	10 kΩ or higher
      B30-70 (IAC1) or R4-1 (OUT) - Body ground	Always	10 kΩ or higher
      B30-71 (EIA1) or R4-2 (GND) - Body ground	Always	10 kΩ or higher

   4. Reconnect the intake air control valve actuator connector.
   5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 1: Identifying Intake Air Control Valve Actuator Connector And ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

4. INSPECT ECM (VCIA VOLTAGE) 
   1. Disconnect the intake air control valve actuator connector.
   2. Turn the ignition switch to ON.
   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      3 (VDD) - Body ground	Ignition switch ON	4.5 to 5.0 V

   4. Reconnect the intake air control valve actuator connector.

      NG: REPLACE ECM  (See REMOVAL )

      Fig 2: Identifying Intake Air Control Valve Actuator Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

5. REPLACE INTAKE MANIFOLD 
   1. Replace the intake manifold (See REMOVAL ).
6. CHECK WHETHER DTC OUTPUT RECURS (DTC P2014, P2016 AND/OR P2017 ARE OUTPUT AGAIN) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON and turn the Techstream on.
   3. Clear DTCs (See DTC CHECK / CLEAR ).
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   5. Read DTCs.

      Result 

      RESULT CHART
      
      

      Display (DTC Output)	Proceed to
      P2014, P2016 and/or P2017 are output again	A
      No output	B

      B: END 

      A: REPLACE ECM  (See REMOVAL )