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

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1. 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: Disconnecting Vacuum Hose From Vacuum Tank

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES 

OK: Go to Next Step. 

1. Connect the oscilloscope between terminals ACM and E1 of the E8 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 E8 ECM connector.

   Result: 

   RESULT REFERENCE
   
   

   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: Measuring Voltage Between Terminals ACM And E1 Of E8 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Go to step   6 

NG: Go to Next Step. 

1. Disconnect the V15 VSV connector.
2. Measure the resistance between the terminals 1 and 2.

   Standard: 19 to 21° at 20°C (68°F) 

   Fig 4: Inspecting VSV For ACM

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE VSV 

OK: Go to Next Step. 

1. Check the wire harness between the VSV and ECM.
   1. Disconnect the V15 VSV connector.
   2. Disconnect the E8 ECM connector.
   3. Check the resistance of the wire harness side connectors.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      V15-2 - E8-6 (ACM)	Below 1 Ω
      V15-2 or E8-6 (ACM) - Body ground	10 kΩ or higher

      Fig 5: Identifying V15 VSV Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the wire harness between the VSV and EFI relay.
   1. Disconnect the V15 VSV connector.
   2. Remove the EFI relay from the engine room J/B.
   3. Check the resistance of the wire harness side connectors.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      V15-1 (VSV for ACM) - J/B EFI relay terminal 3	Below 1 Ω

      Fig 6: Checking Wire Harness Between VSV And EFI Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE ECM (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

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: Removing VSV

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. 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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE TRANSVERSE ENGINE, ENGINE MOUNTING INSULATOR 

OK: 

SYSTEM OK