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.

NG; REPAIR OR REPLACE VACUUM HOSES

Fig 1: Checking Air And Vacuum Hoses

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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.

NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES

Fig 2: Reconnecting Vacuum Hose

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OK: GO TO NEXT STEP

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

   Standard voltage

   VOLTAGE SPECIFIED CONDITION
   
   

   Condition	Specified Condition
   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

OK: Go to step  8

Fig 3: Measuring Voltage Between Terminals ACM And E1 Of ECM Connector

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NG: GO TO NEXT STEP

1. Disconnect the V5 VSV for ACM connector.
2. Measure the resistance between the terminals 1 and 2.

   Standard resistance

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

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

NG: REPLACE VSV

Fig 4: Identifying V5 VSV For ACM Connector

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OK: GO TO NEXT STEP

1. Check the wire harness between the VSV and ECM.
   1. Disconnect the V5 VSV connector for ACM.
   2. Disconnect the E9 ECM connector.
   3. Check the resistance of the wire harness side connectors.

      Standard resistance

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      V5-2 - E9-6 (ACM)	Below 1 Ω
      V5-2 or E9-6 (ACM) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Identifying V5 VSV Connector For ACM

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OK: GO TO NEXT STEP

1. Remove the EFI No. 2 fuse from the engine room R/B.
2. Measure the resistance of the EFI No. 2 fuse.

   Standard resistance:

   Below 1 Ω

3. Reinstall the EFI No. 2 fuse.

NG: REPLACE EFI NO. 2 FUSE

Fig 6: Removing EFI No. 2 Fuse From Engine Room R/B

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OK: GO TO NEXT STEP

1. Check the wire harness between the VSV and EFI relay.
   1. Disconnect the V5 VSV connector.
   2. Remove the EFI relay from the engine room J/B.
   3. Check the resistance of the wire harness side connectors.

      Standard resistance

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      V5-1 (VSV for ACM) - EFI relay terminal 3	Below 1 Ω
      V5-1 (VSV for ACM) or EFI relay terminal 3 - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 7: Identifying V5 VSV Connector

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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.

NG: REPLACE VSV FOR ACM

Fig 8: Inspecting VSV For ACM (Operation)

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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.

NG: REPLACE FRONT ENGINE MOUNT INSULATOR

Fig 9: Inspecting Front Engine Mount Insulator

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OK: SYSTEM OK