Inspection Procedure

CHECK VACUUM HOSES
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
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Go to next step
CHECK VACUUM
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
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Go to next step
INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION)
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: Checking Vacuum Switching Valve Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Go to next step
INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)
1. Disconnect the VSV for 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 ACM connector.
  NG: REPLACE DUTY VACUUM SWITCHING VALVE
  
  Fig 4: Identifying B15 VSV For ACM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Go to next step
INSPECT ENGINE MOUNTING INSULATOR ASSEMBLY FRONT
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.
  
  Fig 5: Checking Engine Mounting Insulator Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: REPLACE FRONT ENGINE MOUNTING INSULATOR ASSEMBLY
  
  OK: Go to next step

CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM)

Check the wire harness between the VSV for ACM connector and the ECM connector.

Disconnect the VSV for ACM connector.
Disconnect the ECM connector.

Measure the resistance between the wire harness side connectors.

Standard resistance (Check for open)

RESISTANCE SPECIFIED CONDITIONS

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

Standard resistance (Check for open)

RESISTANCE SPECIFIED CONDITIONS

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

Reconnect the ECM connector.
Reconnect the VSV connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 6: Identifying B15 VSV For ACM And B50 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT DUTY VACUUM SWITCHING VALVE (VOLTAGE)

Disconnect the VSV for ACM connector.
Turn the ignition switch to ON.

Measure the voltage between the terminals.

Standard voltage

VOLTAGE SPECIFIED CONDITION

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

NG: Go to step 8

Fig 7: Identifying B15 VSV For ACM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM (See REMOVAL )

CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ENGINE JUNCTION BLOCK (EFI RELAY))

Check the wire harness between the VSV for ACM and the EFI relay.

Disconnect the VSV for ACM connector.
Remove the engine room junction block.

Measure the resistance between the wire harness side connectors.

Standard resistance (Check for open)

RESISTANCE SPECIFIED CONDITIONS

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

Standard resistance (Check for short)

RESISTANCE SPECIFIED CONDITIONS

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

Reconnect the VSV for ACM connector.
Reinstall the engine room junction block.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 8: Identifying Engine Room Junction Block And VSV For ACM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: OK REPLACE ECM (See REMOVAL )