Inspection Procedure

1. CHECK AIR/VACUUM HOSE:

A. Check the Air/Vacuum Hose for looseness, disconnection and blockage.

B. Verify that the Air Hose Cap is installed.

2. CHECK ACTIVE CONTROL ENGINE MOUNT SYSTEM:

Preparation:

A. Warm up the engine to normal operating temperature.

B. Connect the LEXUS Hand-Held Tester to DLC3.

C. Select the ACM Inhibit Active Test on the Lexus Hand-Held Tester.

D. Shift the transmission into "N" or "P" range.

Check:
Verify that engine vibration is increased while the ACM Inhibit Active Test is in the "ON" state.





OK:
Engine vibration is increased.








3. CHECK ENGINE VACUUM:

NOTICE:
^ To ensure safety, conduct this test in a wide, clear, level area.
^ Do not stand in front of the vehicle.

A. Warm up the engine to normal operating temperature.

B. Chock all 4 wheels.

C. Fully apply the Parking Brake.

D. Keep your foot firmly placed on the Brake Pedal.

E. Shift the transmission into "D" range.

F. Disconnect the Air Hose.

Check:
Verify that the disconnected hose applies pulsed vacuum.











4. CHECK VOLTAGE AT TERMINALS

ACM1 OF ECM:

Preparation:

A. Remove the Glove Compartment.

B. Connect the Autoprobe to Terminal ACM1 of ECM.

C. Warm up the engine to normal operating temperature.

D. Measure voltage at Terminal ACM1 of ECM.








5. CHECK RESISTANCE OF ACM VSV:

Preparation:
Disconnect the ACM VSV Connector.

Check:

A. Measure resistance between the terminals.

B. Measure the resistance between each terminal and body.

OK:

A. Resistance: 18-22 Ohms at 20°C (68°F).

B. Resistance: No continuity.





6. CHECK FOR OPENS AND SHORTS IN THE HARNESS AND CONNECTOR BETWEEN EFI MAIN RELAY AND ACM VSV, AND BETWEEN THE ACM VSV AND THE ECM:








7. CHECK OPERATION OF ACM ASV:

Preparation:
Disconnect the VSV Connector for ACM.

Check:
Check operation of the ACM VSV when Battery Voltage is applied to the VSV Connector Terminals.

OK:
Battery Voltage not applied: Air flows from Pipe G through Pipe E.

Battery Voltage Applied: Air flows from Pipe F through Pipe E.








8. CHECK FRONT ENGINE MOUNT INSULATOR:

Preparation:

A. Disconnect the Vacuum Hose from the Front Engine Mount Insulator.

B. Using a Mityvac or similar Hand-Held Vacuum Pump apply vacuum of 80 kPa (600 mm.Hg, 25 in.Hg) and allow it to stand for 1 minute.

Check:

A. Check that vacuum does not bleed off.

B. Check that there is no fluid leakage caused by damage to the lower Diaphragm.