Incorrect Gear Ratio

Incorrect gear ratio

Checking the adjustment of the gear-shift position sensor




- Ignition on
- Read off the position of the gear selector.
Move the gear selector into all positions. Check that the gear-shift positions are updated.

Note! Select the correct gear lever carrier from the list.

Hint: If the display shows an undefined position (O2 for example) the gear position sensor is incorrectly adjusted.

Remedy as necessary

Other information:
- Gear-shift position sensor, checking/adjusting Adjustments









Is the gear-shift position sensor incorrectly adjusted?

Yes - Verification

No - Checking the quality and level of transmission fluid

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Checking the quality and level of transmission fluid

Note! The quality and level of transmission fluid is vital to transmission function. It is therefore important that these are correct. Fluid level is also affected by its temperature.




- Ignition on
- Read the fluid temperature.
Check the transmission fluid level. If it is low, check the transmission for leaks and then top off the fluid.
Check the fluid quality.
If the fluid smells burnt, change the transmission fluid.
In addition, check the transmission fluid for an abnormal amount of particles by taking a sample with the dipstick.
If the transmission fluid contains an abnormal amount of particles, replace the transmission.

Other information
- Oil level, checking Checking Oil Level
- Gearbox fluid, replacing Transmission Fluid, Replacing

Select an alternative below
1. No fault found.
2. Transmission fluid changed, level low or quality poor.
3. The transmission fluid contains an abnormal amount of particles.









1 - Checking for contact resistance and oxidation

2 - Resetting adaptation and the fluid quality counter

3 - Replacing the gearbox

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Checking for contact resistance and oxidation




- Ignition off
Check the transmission connectors and the control module connector for contact resistance and oxidation.

Other information:
- To access transmission connectors: Connectors transmission, disconnecting / connecting Procedures
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault


Continue - Checking noise in the gearbox

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Checking noise in the gearbox
- Test drive the vehicle following: Test drive schedule, description Test Drive Schedule, Description
- Check for any clearly audible noises from the gearbox. Check for malfunctions.





Does the transmission exhibit any noises or function problems?

Yes - Replacing the gearbox

No - Replacing the control system/transmission

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Replacing the control system/transmission
Test with a new control system following: Solenoid control system, replacing Solenoid Control System, Replacing.
If this does not help, replace the transmission following: Gearbox, removing Transmission, Removing and Transmission, installing Transmission, Installation.






Continue - Resetting adaptation and the fluid quality counter

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Replacing the gearbox
Replace the gearbox. See Gearbox, removing Transmission, Removing and Transmission, installing Transmission, Installation.






Continue - Resetting adaptation and the fluid quality counter

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Resetting adaptation and the fluid 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 - Verification

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Verification




Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, components, etc.
- Ignition on
Test drive the vehicle following: Test drive schedule, description Test Drive Schedule, Description
During the test drive, oil temperature should be over 20 °C.
Note any deviations in transmission function.

Does the transmission function flawlessly?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the adjustment of the gear-shift position sensor

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