So here's the height correction procedure to be used with Diagbox for when you need to fine tune it Alan. Be aware that the units shown in your Diagbox screenshots are 'Steps' not units of measurement....
Procedure: As always, never get under the car when undertaking any work on the suspension system unless it is fully supported - especially so when adjusting height correctors (danger of crushing).
1 Tools
A Diagnostic Tool (Diagbox)
2 Preliminary operations
- Verify the tyre pressure.
- Place the vehicle on a 4-post lift.
- Slacken the parking brake .
- Position the body height at the high position.
- Position the body height at the normal position (driving height).
- Switch on the ignition.
- Raise the vehicle.
Identification: Measuring zones - Vehicle heights at setting height
Wheel radiuses R:
- R1: Front wheel radius (L.H. side)
- R1': Front wheel radius (right)
- R2: Rear wheel radius (L.H. side)
- R2: Rear wheel radius (right)
Heights H:
- H1: Height between the measuring zone under the front LH subframe and the ground
- H1': Height between the measuring zone under the front RH subframe and the ground
- H2: Height between the measuring zone under the rear LH axle crossmember and the ground
- H2: Height between the measuring zone under the rear RH axle crossmember and the ground
Heights K:
- K1: Height between the wheel centre line and the measuring zone under the subframe (left hand front)
- K1': Height between the wheel centre line and the measuring zone under the subframe (Front RH)
- K2: Height between the wheel centre line and the measuring zone under the axle crossmember (rear left hand side)
- K2': Height between the wheel centre line and the measuring zone under the axle crossmember (Rear right hand side)
"Z1" : Measuring zone under the front subframe.
"Z2" : Measuring zone under the rear axle crossmember.
3.1 Check: Front height
Measure:
- The wheel radiuses R1 and R1 ; Using the tools [U701-0], [9801-T]
- The heights H1 and H1’ ; Using tool [U701-0]
Calculate:
- The height K = R1 - H1
- The height K1' = R1' - H1'
Calculate the average of the heights K1 and K1' : (K1 + K1') / 2.
Compare this calculated height with the reference height.
N.B.: Reference height (front) : 160 ± 6 mm.
Pre-adjust the front height if (K1 + K1')/2 is greater than 190 mm or less than 130 mm (Section 4).
3.2 Check: Rear height
Measure:
- The radiuses R2 and R2’ ; Using the tools [U701-0], [9801-T]
- The heights H2 and H2’ ; Using tool [U701-0]
Calculate:
- The height K2 = R2 - H2
- The height K2' = R2' - H2'
Calculate the average of the heights K2 and K2' : (K2 + K2') / 2.
Compare this calculated height with the reference height.
N.B.: Reference height (rear): 106 ± 6 mm.
Pre-adjust the rear height if (K2 + K2')/2 is greater than 140 mm or less than 80 mm (Section 4)
4 Pre-setting the heights
4.1. Pre-adjusting the front height
Slacken the fixing bolt (2).
Slightly rotate the collar (1) on the anti-roll bar.
Wait for the correction of the vehicle’s height.
Re-tighten : The securing bolt (2) ; Tighten to 0,6 daN.m.
Do a new check of the front height :
- If (K1 + K1')/2 is greater than 190 mm
- If (K1 + K1')/2 is less than 130 mm
4.2. Pre-adjusting the rear height
Slacken the fixing bolt (4).
Slightly rotate the collar (3) on the anti-roll bar.
Wait for the correction of the vehicle’s height.
Re-tighten: The securing bolt (4) ; Tighten to 0,6 daN.m.
Do a new check of the rear height:
- If (K2 + K2')/2 is greater than 140 mm
- If (K2 + K2')/ 2 is less than 80 mm
5. Adjusting the heights; Using the diagnostic equipment
Connect the diagnostic equipment to the vehicle’s diagnostic socket.
Carry out an global test.
Select the corresponding "suspension" menu.
Select: "SUSPENSION".
Select: "Adjustment of the vehicle reference heights".
Follow the instructions on the screen.
Calculate:
- 320 - (K1 + K1')/2 (for the front)
- 212 - (K2 + K2')/2 (for the rear)
Enter these values into the diagnostic tool.
Wait for the correction of the vehicle’s height.
Check the reference heights.