Inspection Procedure

HINT:

• If different DTCs that are related to a different system are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may be open.
• Read freeze frame data using hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Hand-held tester: 

1. PERFORM ACTIVE TEST BY HAND-HELD TESTER 
   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.
   3. Enter ALL from DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / IACV MOTOR (IMRV motor).
   4. Scroll the data list by the up or down button to display IACV POSITION (IMRV position sensor).
   5. Check the voltage output of IACV POSITION while the IMRV motor is driven from full closed to full open (or from full open to full closed) using the hand-held tester.

      Standard: The voltage output of IACV POSITION remains between 0.2 to 4.8 V while the IMRV motor is driven from -100 to 100 % (or from 100 to -100 %). 

   HINT:

   IACV MOTOR - OPERATION TABLE
   
   

   IACV MOTOR operation	IACV POSITION (Normal)	Suspect failure area
   		IACA circuit short VC circuit open	VC and IACA circuit short-circuited IACA circuit open E2 circuit open	Sensor malfunction
   -100 %	0.2 to 1.0 V	Remain less than 0.2 V	Remain more than 4.8 V	Other than the voltage in the next 2 columns on the left
   100 %	3.2 to 4.8 V	Remain less than 0.2 V	Remain more than 4.8 V

   OK: Go to step   5 

   NG: Go to next step 

2. CHECK WIRE HARNESS (ECM - IMRV) 
   1. Disconnect the I18 IMRV connector.
   2. Disconnect the E10 ECM connector.
   3. Check the resistance of the wire harness side connectors.
      Fig 1: Identifying ECM And IMRV Connector Terminals

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard: 

   ECM - IMRV - RESISTANCE TABLE
   
   

   Tester Connection	Specified Condition
   I18-1 (IACA) - E10-22 (IACA) I18-3 (VC) - E10-18 (VC) I18-2 (E2) - E10-28 (E2)	Below 1 Ω
   I18-1 (IACA) or E10-22 (IACA) - Body ground I18-3 (VC) or E10-18 (VC) - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to next step 

3. INSPECT ECM (VC VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Check the voltage of the E10 ECM connector.
      Fig 2: Identifying ECM Connector Terminals

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard: 

   ECM CONNECTOR - VOLTAGE TABLE
   
   

   Tester Connection	Specified Condition
   E10-18 (VC) - E10-28 (E2)	4.5 to 5.5 V

   NG: REPLACE ECM (See step 6 on ECM (2AZ-FE)  ) 

   OK: Go to next step 

4. REPLACE INTAKE MANIFOLD RUNNER VALVE ASSY 

   Go to next step 

5. READ OUTPUT DTC (DTC P2014, P2016 AND/OR P2017 ARE OUTPUT AGAIN) 
   1. Clear the DTC (See DTC CHECK/CLEAR ).
   2. Start the engine.
   3. Run the engine at more than 3,000 rpm.
   4. Turn the ignition switch OFF.

      HINT:

      As running the engine to 3,000 rpm the IMRV usually fully opened. If the ignition switch is turned OFF under this condition, the IMRV fully closed and then becomes half-opening angle.

   5. Turn the ignition switch ON 20 seconds later.
   6. Read the DTC.

      Result: 

B: SYSTEM OK 

A: REPLACE ECM (See step 6 on  ECM (2AZ-FE)  ) 

OBD II scan tool (excluding hand-held tester): 

1. CHECK WIRE HARNESS (ECM - IMRV) 
   1. Disconnect the I18 IMRV connector.
   2. Disconnect the E3 ECM connector.
   3. Check the resistance of the wire harness side connectors.
      Fig 3: Identifying ECM And IMRV Connector Terminals

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard: 

   ECM - IMRV - RESISTANCE TABLE
   
   

   Tester Connection	Specified Condition
   I18-1 (IACA) - E10-22 (IACA) I18-3 (VC) - E10-18 (VC) I18-2 (E2) - E10-28 (E2)	Below 1 Ω
   I18-1 (IACA) or E10-22 (IACA) - Body ground I18-3 (VC) or E10-18 (VC) - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to next step 

2. INSPECT ECM (VC VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Check the voltage of the E10 ECM connector.
      Fig 4: Identifying ECM Connector Terminals

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard: 

   ECM CONNECTOR - VOLTAGE TABLE
   
   

   Tester Connection	Specified Condition
   E10-18 (VC) - E10-28 (E2)	4.5 to 5.5 V

   NG: REPLACE ECM (See step 6 on ECM (2AZ-FE)  ) 

   OK: Go to next step 

3. REPLACE INTAKE MANIFOLD RUNNER VALVE ASSY 

   Go to next step 

4. READ OUTPUT DTC (DTC P2014, P2016 AND/OR P2017 ARE OUTPUT AGAIN) 
   1. Clear the DTC (See DTC CHECK/CLEAR ).
   2. Start the engine.
   3. Run the engine at more than 3,000 rpm.
   4. Turn the ignition switch OFF.

      HINT:

      As running the engine to 3,000 rpm the IMRV usually fully opened. If the ignition switch is turned OFF under this condition, the IMRV fully closed and then becomes half-opening angle.

   5. Turn the ignition switch ON 20 seconds later.
   6. Read the DTC.

      Result: 

B: SYSTEM OK 

A: REPLACE ECM (See step 6 on ECM (2AZ-FE)  )