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 (Missing Hose Cap)
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: Checking 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 E7 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 E7 ECM connector.

Standard voltage 

Fig 3: Inspecting ECM (ACM Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO STEP   6 

NG : Go to next step 

1. Disconnect the V2 VSV for ACM connector.
2. Measure the resistance between the terminals 1 and 2.

Standard resistance 

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 for ACM and ECM.
   1. Disconnect the V2 VSV connector for ACM.
   2. Disconnect the E7 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

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

   Tester Connection	Specified Condition
   V2-2 - E7-6 (ACM)	Below 1 Ω
   V2-2 or E7-6 (ACM) - Body ground	10 kΩ or higher

2. Check the wire harness between the VSV and EFI MAIN relay.
   1. Check the EFI No. 2 fuse from the fusible link block.
      • Remove the EFI No. 2 fuse from the fusible link block.
      • Measure the resistance of the EFI No. 2 fuse.

        Standard resistance: 

        Below 1 Ω 

      • Reinstall the EFI No. 2 fuse.
   2. Disconnect the V3 VSV for ACM connector.
   3. Remove the EFI MAIN relay from the engine room J/B.
   4. Measure the resistance of the wire harness side connectors.

Standard resistance 

Fig 5: Checking Harness And Connector (VSV For ACM - ECM, VSV For ACM - EFI Main Relay)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR 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 6: 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 7: Inspecting Front Engine Mount Insulator
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE FRONT ENGINE MOUNT INSULATOR 

OK : SYSTEM OK