Inspection Procedure

1. Check if the vacuum hose cap is missing.
2. If the hose is damaged, replace the vacuum hose assembly.
3. Check the air and vacuum hoses for looseness, disconnection and blockage.
Fig 1: Checking Vacuum Hoses
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE VACUUM HOSES 

OK: GO TO NEXT STEP 

1. Start the engine.
2. Disconnect the vacuum hose from the vacuum tank.
3. Check that the unconnected port located on the vacuum tank applies suction to your finger.
4. Reconnect the vacuum hose.

Fig 2: Clhecking Vacuum

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES 

OK: GO TO NEXT STEP 

1. Connect the oscilloscope between terminals ACM and E1 of the E6 ECM connector.
2. Warm up engine to normal operating temperature.
3. Turn the A/C switch on.
4. Measure the voltage between terminals ACM and E1 of the E6 ECM connector.

   Voltage 

   ECM (ACM VOLTAGE)
   
   

   Condition	Voltage
   Shift position is D range, and engine speed is 850 RPM or less	Pulse generation
   Shift position is D range, and engine speed is 950 RPM or more	9 to 14 V
   Shift position is P range	9 to 14 V

   Fig 3: Checking ECM (ACM Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step   6 

NG: GO TO NEXT STEP 

1. Disconnect the V3 VSV connector.
2. Measure the resistance between the terminals 1 and 2.

   Resistance 

   VSV FOR ACM (RESISTANCE)
   
   

   Tester connection	Condition	Specified Condition
   1 - 2	20°C (68°F)	19 to 20

   Fig 4: Inspecting VSV For ACM (Resistance)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE VSV 

OK: GO TO NEXT STEP 

1. Check the wire harness between the VSV and ECM.
   1. Disconnect the V3 VSV connector for ACM.
   2. Disconnect the E6 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

      Resistance 

      VSV FOR ACM - ECM, VSV FOR ACM - EFI RELAY
      
      

      Tester connection	Specified Condition
      V3-2 - E6-6 (ACM)	Below 1 ohms
      V3-2 or E6-6 (ACM) - Body ground	10 k ohms or higher

      Fig 5: Checking Wire Harness Between VSV And ECM

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the wire harness between the VSV and EFI relay.
   1. Disconnect the V3 VSV connector.
   2. Remove the EFI relay from the engine room J/B.
   3. Measure the resistance of the wire harness side connectors.

      Resistance 

      VSV FOR ACM - ECM, VSV FOR ACM - EFI RELAY
      
      

      Tester connection	Specified Condition
      V3-1 (VSV for ACM) - J/B EFI relay terminal 3	Below 1 ohms

      Fig 6: Checking Wire Harness And VSV And EFI Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE ECM 

1. Remove the VSV.
2. Check operation of the VSV when battery positive voltage is applied to the terminals of the VSV connector.
   • Battery positive voltage is not applied: The air from pipe G is flowing out through pipes E and H. 
   • Battery positive voltage is applied: The air from pipe F is flowing out through pipes E and H. 
Fig 7: Inspecting VSV For ACM (Operation)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE VSV FOR ACM 

OK: GO TO NEXT STEP 

1. Disconnect the vacuum hose from the front engine mount insulator.
2. Using MITYVAC (Hand-held Vacuum Pump), apply a vacuum of 80 kPa (600 mmHg, 25 in.Hg) and wait for 1 minute.
3. Make sure there is no needle movement on the MITYVAC.
4. Check that there is no fluid leakage caused by a broken lower diaphragm.
Fig 8: Inspecting Transverse Engine Mounting Insulator
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE TRANSVERSE ENGINE MOUNTING INSULATOR 

OK: SYSTEM OK