AR32.33-L-0004A | Calibrating electronic level adjustment (ELA) control unit | 9.6.99 |
MODELS 668.3, 670.3
with CODE (CE2) Air suspension at rear
with CODE (CE3) Air suspension at front and rear
Electronic level adjustment (ELA)
L32.33-0003-01
L32.33-0004-01
L32.33-0005-01
Rear axle
A Adjustment dimension
1 Frame
2 Hollow rubber spring
3 Spacer pad
4 Spring and U-bracket
5 Axle
Front axle as of end no. 071 158
A Adjustment dimension
1 Frame
2 Air bellows bracket
3 Spacer pad
4 Spring and U-bracket
5 Axle
Front axle up to end no. 071 157
A Adjustment dimension
1 Frame
2 Air bellows bracket
3 Spacer pad
4 Spring and U-bracket
5 Axle
| The program is run interactively display on the HHT screen. It is important to follow the sequence described below otherwise the vehicle will not be calibrated correctly. | ||
1 | Connect the HHT | With M 602 (12V unit), connect at 2nd diagnostic socket (24V). | |
2 | Vent air bellows at rear axle | The pressure in the air bellows must not exceed the maximum of 7 bar. | |
3 | Vent the air bellows at front axle | The pressure in the air bellows must not exceed the maximum of 7 bar. With Code CE3. | |
Calibrate driving level | |||
4 | Raise frame at rear, insert spacer pad and lower frame onto spacer pad | Dimension A depends on the vehicle model | |
| Spacer pad for level control | Models 668.3, 670.3 with Code CE2, CE3 and electronic level adjustment (ELA) | |
5 | Raise frame at front, insert spacer pad and lower frame onto spacer pad | With Code CE3. Dimension A depends on the vehicle model | |
| Spacer pad for level control | Models 668.3, 670.3 with Code CE2, CE3 and electronic level adjustment (ELA) | |
6 | Save adjustment value using the HHT | The values for the rear on the left and right must not deviate more than 5 counts If the difference is greater than 5 counts, the installation position of the rear position sensors must be checked. | |
Calibrate the upper limit | |||
7 | Determine the values for the limit | Paul air suspension: Rear axle: calibrated level + 60 counts Front axle:calibrated level + 40 counts MB air suspension: Rear axle: calibrated level + 40 counts Front axle: calibrated level + 40 counts | |
8 | Raise frame at front until the value for the upper limit is reached | With Code CE3. | |
9 | Raise frame at rear until the value for the upper limit is reached | With Paul air suspension: The safety ropes must not be completely taut. | |
10 | Save adjustment value using the HHT | ||
11 | Remove spacer pads at front and rear | ||
Calibrate the lower limit | |||
12 | Lower the frame at the rear until the axle stop (hollow rubber spring) is reached | ||
13 | Lower the frame at the front until the axle stop (hollow rubber spring) is reached | With Code CE3. | |
14 | Save adjustment value using the HHT | ||
15 | Erase ELA fault memory | If the vehicle has been calibrated correctly, the "ELA" and "Level Control" indicator lamps extinguish and the vehicle is adjusted to the correct level. |