Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2005 Toyota Avalon LimitedFACTORY OEM SERVICE PROCEDURE

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.
  
  Fig 1: Checking Air And Vacuum Hoses For Looseness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE VACUUM HOSES
2. OK: Go to next step.
CHECK VACUUM
1. Start the engine.
2. Disconnect the vacuum hose from the air cleaner cap.
3. Check that an unconnected port located on the vacuum tank applies suction to your finger.
  Resistance:
  
  Vacuum pressure exists
4. Reconnect the vacuum hose.
  
  Fig 2: Disconnecting Vacuum Hose From Air Cleaner Cap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES
2. OK: Go to next step.

INSPECT ECM

Connect the oscilloscope between terminals ACM and E1 of the B45 and B47 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.

Fig 3: Connecting Oscilloscope Between Terminals ACM And E1 Of B45 And B47 ECM Connectors

G02976386

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result:

ECM CONDITION

Condition	Voltage
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 4: Identifying Pattern

G02976387

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 B15 VSV for ACM connector.
2. Measure the resistance between terminals 1 and 2.
  Resistance: 19 to 21 Ω at 20°C (68°F)
3. Reconnect the VSV for ACM connector.
  
  Fig 5: Identifying Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE DUTY VACUUM SWITCHING VALVE
2. 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 B15 VSV for ACM connector.
Disconnect the B45 ECM connector.

Measure the resistance between the wire harness side connectors.

Standard (Check for open):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VSV for ACM (B15-2) - ACM (B45-3)	Below 1 Ω

Fig 6: Identifying Connector

G02976389

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VSV for ACM (B15-2) or ACM (B45-3) - 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 engine room junction block.

Measure the resistance between the wire harness side connectors.

Fig 7: Reconnecting ECM Connector

G02976390

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for open):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
VSV for ACM (B15-1) - engine room junction block (EFI relay) (1D-5)	Below 1 Ω

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

Fig 8: Identifying Engine Room Junction Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ECM (SEE REPLACEMENT )

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.
  
  Fig 9: Applying Voltage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE DUTY VACUUM SWITCHING VALVE
2. OK: Go to next step.
INSPECT ENGINE MOUNTING INSULATOR ASSY FRONT
1. Disconnect the vacuum hose from the front engine mount insulator.
2. Using 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 10: Applying Vacuum
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE ENGINE MOUNTING INSULATOR ASSY FRONT
2. OK: SYSTEM OK

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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