Checking the shift solenoids
If the car has STC or DSTC, these functions must be disengaged. Press in the STC/DSTC button on the center console. Hold the button in for at least 2 seconds. The LED on the button must go out.
- Ignition off
- Raise the car so that the drive wheels are clear of the ground.WARNING:
Ensure that the car is safely raised.
WARNING:Check that there are no objects caught in the front tire treads.
- Start the engine
- Read off the gear ratio on every gear and note the value.
Geartronic
Move the gear selector to Geartronic. Select 1st gear. Accelerate carefully until the engine speed (RPM) is approximately 2000 RPM.
Try to maintain a constant speed throughout the test.
NOTE:The gear ratio varies if a constant vehicle speed and engine speed (RPM) are not maintained. This is because the transmission will free wheel.
Then engage gear 2 within 10 seconds, gear 3 within another 10 seconds, and thereafter gear 4.
Check that the shifts are carried out correctly be comparing the gear ratios with table 1.
Make a note of the shifting pattern and then compare with table 2.
Not Geartronic
Move the gear selector to position 1 and accelerate carefully until the engine speed is approx. 2,000 RPM.
Try to maintain constant RPM throughout the whole test.
NOTE:The gear ratio varies if a constant vehicle speed and engine speed (RPM) are not maintained. This is because the transmission will free wheel.
Then move the gear selector to position 2 within 10 seconds, to position 3 within another 10 seconds, and thereafter to position D (fourth gear).
Check that the shifts are carried out correctly be comparing the gear ratios with table 1.
NOTE:When comparing the gear ratio with table 1, the ratio may vary by up to +-1%. This is normal. This is due to the tolerance in the signals from the wheel sensors.
Replace the control system if an incorrect shift pattern is obtained.
Table 1 Gear Gear ratios Gear ratio (S80 (-06) turbo) Gear ratios Gear ratio (S80 (-06) non-turbo, XC90) 1 2 1.758 3 1.121 4 0.790 Table 2 Solenoid stuck in position Shift pattern Corrective action S1 jammed in the ON position 1 - 1 - 4 - 4 Replace the control system S1 jammed in the OFF position 2 - 2 - 3 - 3 Replace the control system S2 jammed in the ON position 1 - 2 - 2 - 1 Replace the control system S2 jammed in the OFF position 4 - 3 - 3 - 4 Replace the control system NOTE:Diagnostic trouble codes (DTCs) may be stored in the ABS system when the rear wheels are stationary and the front wheels rotate. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.
Other information:
- To replace the control system, see Control system/valve housing, removing for removal. See Installing the control system / valve housing for installation.
Select an alternative
- The shift pattern is according to table 2 above
Refer to Resetting the adaptation
- The shift pattern differs from that in table 2
Refer to Checking mechanical shift valves
- There is no incorrect shift pattern.