Vacuum Modulator Valve

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1. Block drive wheels, apply parking brake and place transmission in park.
2. Start engine and run at slow idle.
3. Connect vacuum gauge to hose leading to VMV port ``M.'' If reading is less than 14 inches Hg, check vacuum pump, VRV, solenoid and connecting hoses.
4. Reconnect hose to VMV port ``M'' and connect gauge to VMV port ``D.''
5. Gauge should read 13 inches Hg. If not, VMV is defective.