Suspension - Air Suspension Calibration Procedure
NUMBER 12-SS-003MODEL(S) VI EQUUS
GROUP SUSPENSION
DATE APRIL 2012
SUBJECT: VI EQUUS AIR SUSPENSION CALIBRATION PROCEDURES
THIS BULLETIN SUPERSEDES TSB 11-SS-005 TO INCLUDE NOTES ON ENVIRONMENTAL EFFECTS ON THE AIR SUSPENSION SYSTEM AND HOW TO RECOVER RIDE HEIGHT.
Description:
This bulletin describes the procedures to check the air mass in the suspension system, refill if necessary, and calibrate the ride height sensors.
*NOTE
^ VI Equus is equipped with an air-suspension system. This system can be affected by changes in ambient temperature and pressure. Under normal vehicle operating conditions, these changes will not affect vehicle performance.
^ During long-term parking without running the engine, ambient conditions may affect vehicle ride height. In the event ride height changes during parking, start and run the engine at idle for 10 minutes to recover proper ride height.
^ If engine idling does not recover proper ride height, it may be necessary to manually fill the system according to the procedures described in this TSB. System air mass must be maintained above 80 bar-liter for proper system operation.
Applicable Vehicles
Warranty Information
GDS Installation Procedure
1. Connect the power supply cable to the diagnostic terminal.
NOTE
If attempting to perform the update with the power supply cable disconnected from the diagnostic terminal, make certain that the diagnostic terminal is charged enough for the update. If not, the update may fail in progress. Therefore, it is strongly recommended to connect the power supply cable to the diagnostic terminal during the update procedure.
2. Connect the USB cable between the VCI and the diagnostic terminal.
NOTE
When performing the update using the GDS, wireless communication between the VCI and the diagnostic terminal is NOT available. Therefore, be sure to connect the USB cable between the VCI and the diagnostic terminal.
3. Connect the 16-pin DLC cable from the VCI into the vehicle's 16-pin connector under the driver side instrument panel.
4. Turn on the VCI and diagnostic terminal with the ignition ON.
NOTE
Do not start the engine.
^ For push-button start, press the start button twice without depressing the brake pedal.
System Air Mass Check
NOTE
^ Suspension must be in Normal height mode.
1. Choose VIN or ECU Upgrade on the initial screen.
2. Enter the vehicle information by pressing the VIN Auto Detect button, entering the vehicle's VIN or selecting the vehicle model, model year, engine/fuel type and ECS as the system and then click OK.
3. Select Inspection/Test on the initial screen after entering the vehicle information.
4. Select Checking Air Pressure System.
5. Select Air Pressure Check and press OK when ready.
6. The results will be displayed. System Air Mass must be 80-120 bar-liter. If the system air mass is less than 80 bar-liter, assuming no leaks are present, the system must be refilled according to the procedures in this TSB.
System Air Filling
NOTES
- Suspension must be in Normal height mode.
- A rubber-tipped air nozzle is required.
- Ensure supply air pressure is at least 175 psi.
- Vehicle must be on a lift with all four wheels off the ground during filling procedure.
- Ignition must be in the ON position during air filling procedure.
- Ensure no system air leaks are present before beginning this procedure. Any leak must be repaired prior to air filling.
1. Choose VIN or ECU Upgrade on the initial screen.
2. Enter the vehicle information by pressing the VIN Auto Detect button, entering the vehicle's VIN or selecting the vehicle model, model year, engine/fuel type and ECS as the system and then click OK.
3. Select Inspection/Test on the initial screen after entering the vehicle information.
4. Select Air Filling/Venting Setup.
5. The vehicle must be on a lift with all four wheels off the ground, with the suspension height setting at NORMAL. Be prepared with a rubber-tipped air nozzle to fill the system. Ensure the supply air pressure is set to at least 175 psi. Locate the air valve on the drivers side of the engine compartment.
6. Select Reservoir and all four air springs. Once selected, press OK while simultaneously filling air through the valve using the rubber-tipped nozzle.
7. A message will come up when the system has been successfully filled. Press OK to complete filling process.
8. After filling is complete, cycle ignition ON and OFF 3 times. Start the engine and verify correct ride height in Normal and High modes by toggling the height selection button on the center console.
9. Check that the system air mass is 80-120 bar-liter using the procedure described in this TSB. If the air mass is below 80 bar-liter, ensure there are no air leaks, and repeat the process. Check for air leaks by listening at the struts, and by spraying soapy water at the air line fittings at the struts and solenoid block.
10. It is necessary to re-calibrate the vehicle ride height sensors after the system air filling. Follow the procedure described below.
Height Sensor Calibration
NOTES
- Suspension must be in Normal height mode.
- Vehicle must be on the ground on all four wheels.
1. Choose VIN or ECU Upgrade on the initial screen.
2. Enter the vehicle information by pressing the VIN Auto Detect button, entering the vehicle's VIN or selecting the vehicle model, model year, engine/fuel type and ECS as the system and then click OK.
3. Select Inspection/Test on the initial screen after entering the vehicle information.
4. Select Height Sensor Calibration.
5. Ensure ignition is ON, engine off, vehicle on the ground, and vehicle height in Normal mode.
6. GDS will read the individual ride heights at each corner of the vehicle, as displayed below. Measure the distances from the center of the wheel to the top edge of the wheel housing. If any discrepancies are found between the data read and the measured height, input the measured heights, then select OK to complete the calibration.