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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1721 (Vehicle Dynamic Suspension) >> Diagnostic Tests >> Vehicle Dynamic Suspension >> Pinpoint Tests >> Pinpoint Test I: The Air Compressor Runs Continuously with the Ignition Switch in the OFF Position and No DTCs Are Set >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

With the air suspension switch and the ignition switch both in the ON position, the Vehicle Dynamics Module (VDM) uses input from the suspension height sensor to determine if vehicle payload has changed enough to warrant the adjustment of the rear suspension. If an adjustment is necessary, the VDM will open the air spring solenoids and activate the air compressor to inflate the air springs and raise the rear suspension. To deflate the air springs and lower the rear suspension, the VDM will open the air spring solenoids and activate the vent solenoid.

With the air suspension switch in the OFF position, the VDM will ignore height sensor input and not adjust the rear suspension. When the ignition switch is placed in the OFF position, the VDM will remain powered for approximately 60 minutes to allow the system to adjust the rear suspension due to changes in vehicle payload. Once the 60 minutes has elapsed, the VDM will depower and will ignore any height sensor input until the ignition switch is placed in the ON position.

This pinpoint test is intended to diagnose the following:

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