Checking the Front and Rear Servo and Accumulator Pistons
Checking the front and rear servo and accumulator pistons
Checking the front and rear servo and accumulator pistons
- If there is no second gear or if it slips this could be due to a leaking seal for 1-2 accumulator piston
- If it is difficult to shift from 1st to 2nd gear this may be due to a defective spring on a sticking 1-2 accumulator piston
- If there is no 3rd gear this could be due to a leaking seal for 2-3 accumulator piston
- If it is difficult to shift from 2nd to 3rd gear this may be due to a defective spring on a sticking 2-3 accumulator piston
- If there is no forward drive in manual 3rd gear (Geartronic) but in 1st and 2nd the front servo may be defective.
Note! If there is no 4th gear this could be due to a leaking seal for 3-4 accumulator piston. Harsh shifting from 3rd to 4th gear may be due to a sticking 3-4 accumulator piston. In these cases the transmission must be replaced.
Other information
- Piston / cover back-up (reverse) servo, replacing Piston/Cover, Back-Up (Reverse) Servo, Replacing
- Sealing ring and piston with O-ring for the front servo, replace Sealing Ring and Piston With O-Ring For Front Servo, Replacing
- Gasket/O ring servo cylinder, replacing Gasket/O Ring Servo Cylinder, Replacing
- To check/replace the accumulator piston 1-2 and 2-3 see Gasket / piston accumulator, replacing Gasket/Piston, Accumulator, Replacing
- Gearbox, removing Gearbox, Removing
- Gearbox, installing Gearbox, Installing
Was any corrective action taken?
Yes - Resetting the adaptation and oil quality counter
No - No Fault Found
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Resetting the adaptation and oil quality counter
Resetting the adaptation
Resetting adaptation and the counter for "Transmission oil change"
Hint: The transmission has torque controlled adaptive pressure control. Pressure control means that the transmission regulates the pressure itself during each gear shift. This avoids harsh gear shifting. Each gear shift is evaluated by the control module and stored in the memory. This allows for compensation for wear and tear in the transmission and clutch. It is important that the adaptation in the memory is reset after the transmission has been repaired. This is to ensure normal operation. The oil is replaced during repair; the "Transmission oil change" counter must be reset. If the counter is not reset when the fluid is drained and replaced, there is a risk that a diagnostic trouble code (DTC) will be stored in incorrect circumstances.
Note! This applies only if the transmission or one of the components in the transmission have been replaced.
- Ignition on.
Click on the VCT2000 symbol to reset the adaptation and counter.
Continue - DONE
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DONE - Verification
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Verification
Checking automatic transmission
Checking automatic transmission
Note! After carrying out the repair check that the symptom has been remedied. Check the automatic transmission as follows:
- Test drive the car to test the function of the automatic transmission. See Test Drive Form, description Test Drive Schedule, Description
- If hydraulic hoses, gaskets or other components have been replaced, check that there is no oil leakage after the test drive.
Is the automatic transmission OK?
Yes - Verification complete
No - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit Fault-Tracing
No - Attempt New Test
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Attempt New Test - Checking the front and rear servo and accumulator pistons
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