Inspection Procedure

1. If the hose is damaged, replace the vacuum hose assembly.
2. Check the air and vacuum hoses for looseness, disconnection and blockage.

NG: REPAIR OR REPLACE VACUUM HOSES 

Fig 1: Checking Vacuum Hoses

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OK: Go to next step 

1. Start the engine.
2. Disconnect the vacuum hose from the air cleaner cap.
3. Check that the disconnected port located on the vacuum tank applies suction to your finger.

   OK: 

   Vacuum pressure exists. 

4. Reconnect the vacuum hose.

NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES 

Fig 2: Identifying Vacuum Hose

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OK: Go to next step 

1. Remove the VSV for ACM.
2. Check operation of the VSV for ACM when positive battery voltage is applied to the terminals of the VSV for the ACM connector.

   Positive battery voltage is not applied: 

   The air from pipe G is flowing out through pipes E and H. 

   Positive battery voltage is applied: 

   The air from pipe F is flowing out through pipes E and H. 

3. Reinstall the VSV for ACM.

NG: REPLACE DUTY VACUUM SWITCHING VALVE 

Fig 3: Applying Battery Voltage To Terminals Of VSV For ACM Connector

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OK: Go to next step 

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

   Standard resistance: 

   19 to 21 Ω at 20°C (68°F) 

3. Reconnect the VSV for the ACM connector.

NG: REPLACE DUTY VACUUM SWITCHING VALVE 

Fig 4: Identifying VSV Connector

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OK: Go to next step 

1. Disconnect the vacuum hose from the front engine mount insulator.
2. Using a vacuum pump, apply vacuum of 80 kPa (600 mmHg, 25 in.Hg) and wait for 1 minute.
3. Check that there is no change in the needle movement of the vacuum pump gauge.
4. Check that there is no fluid leakage caused by a break in the diaphragm.

   OK: 

   Vacuum pressure exists. 

5. Reconnect the vacuum hose.

NG: REPLACE FRONT ENGINE MOUNTING INSULATOR ASSEMBLY 

Fig 5: Inspecting Engine Mounting Insulator Assembly Front

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OK: Go to next step 

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

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      VSV for ACM (B15-2) - ACM (B50-42)	Below 1 Ω

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      VSV for ACM (B15-2) or ACM (B50-42) - Body ground	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the VSV connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 6: Identifying VSV Connector And ECM Connector

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OK: Go to next step 

1. Disconnect the VSV connector.
2. Turn the ignition switch on (IG).
3. Measure the voltage between the terminals.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   B15-1 - Body ground	9 to 14 V

NG: Go to step 8 

Fig 7: Identifying VSV Connector

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OK : REPLACE ECM  (See ECM  )

1. Check the wire harness between the VSV for ACM and the EFI relay.
   1. Disconnect the VSV connector.
   2. Remove the engine room junction block.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Condition
      VSV for ACM (B15-1) -1D-5 (Engine room relay block)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Condition
      VSV for ACM (B15-1) or 1 D-5 (Engine room relay block) - Body ground	10 kΩ or higher

   4. Reconnect the VSV for ACM connector.
   5. Reinstall the engine room junction block.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 8: Identifying VSV For ACM Connector

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OK : REPLACE ECM  (See ECM  )