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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

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

OK: Go to Next Step

INSPECT ECM

Connect the oscilloscope between terminals ACM and E1 of the E8 and E7 ECM connectors.
Warm up the engine to normal operating temperature.
Turn the A/C switch on.

Measure the voltage between terminals ACM and E1 of the ECM connectors.

Standard voltage

VOLTAGE SPECIFICATION

Condition	Specified Condition
Shift position is D, and engine speed is 850 rpm or less	Pulse generation
Shift position is D, and engine speed is 950 rpm or more	9 to 14 V
Shift position is P	9 to 14 V

Fig 3: Identifying E8 And E7 Connectors Terminals

G05840287

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step 6

NG: Go to Next Step

INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)
1. Disconnect the V2 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

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM, VSV FOR ACM - EFI RELAY)

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

Disconnect the V2 VSV for ACM connector.
Disconnect the E8 ECM connector.

Measure the resistance between the terminals of the wire harness side connectors and body ground.

Standard resistance:

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VSV for ACM (V2-2) - ACM (E8-3)	Below 1 Ω

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VSV for ACM (V2-2) or ACM (E8-3) - Body ground	10 kΩ or higher

Reconnect the ECM connector.

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

Remove the EFI MAIN relay from the fusible link block.

Measure the resistance between the wire harness side connectors.

Standard resistance:

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VSV for ACM (V2-1) - EFI MAIN relay terminal (3)	Below 1 Ω

Reconnect the VSV for ACM connector.
Reinstall the EFI MAIN relay.

Fig 5: Identifying V2, E8 And EFI Main Relay Connectors Terminals

G05840289

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See REMOVAL )

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 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

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.
  
  Fig 7: Inspecting Engine Mounting Insulator Assembly Front
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Reconnect the vacuum hose.
NG: REPLACE ENGINE MOUNTING INSULATOR ASSEMBLY FRONT

OK: SYSTEM OK