Jerks Or Does Not Engage
Jerks or does not engage
Checking the oil quality and the oil level in the transmission
Note! Transmission fluid quality and level are extremely important for the function of the transmission. Therefore it is imperative that these are correct. In addition the oil level is dependent on oil temperature.
- Ignition on
- Read off the oil temperature.
Check the transmission oil level at normal operating temperature (approximately +80 °C). If the oil level is low, check for leakage. Top up with oil.
Check the quality of the oil.
Replace the transmission fluid if the fluid smells burnt.
Check the transmission fluid for metal swarf. Take a sample using the dip stick.
Replace the transmission if the transmission fluid contains metal swarf.
Other information:
- Transmission oil level - checking, B5254T7, AW55-50/51SN Checking Oil Level
- Oil grade, checking, B5254T7, AW55-50/51SN Oil Grade, Checking
- Transaxle oil, B5254T7, AW55-50/51SN Transaxle Oil
Select an alternative below:
1. No fault detected
2. Transmission fluid replaced, the level was low or quality was poor
3. The transmission fluid contains metal swarf.
1 - Checking noise in transmission
2 - Resetting oil quality counter
3 - Replacing transmission
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Checking noise in transmission
- Test drive the car according to: Test drive schedule, description, B5254T7, AW55-50/51SN Test Drive Schedule, Description
- Check for noise from the transmission. Check for jerks in the transmission when lock-up engages.
Is the function of the transmission OK?
Yes - No Fault Found
No - Replacing transmission control system
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Replacing transmission
Previous tests indicate that there is a fault in the transmission.
Replace the transmission. See: and
Continue - Resetting adaptation and oil quality counter
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Replacing transmission control system
The previous test indicates that there is a fault in the transmission control system.
Replace the control system. See: Control system, replacing Service and Repair
Continue - Resetting adaptation and oil quality counter
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Resetting oil quality counter
Resetting the Transmission fluid change counter
Resetting the Transmission fluid change counter
Hint: The transmission control module (TCM) has a counter for the oil quality. The counter counts up if the transmission is exposed to too high a load or an ambient temperature that is too high. If the counter is not reset when the oil is drained or changed, there is a risk that a diagnostic trouble code (DTC) will be stored incorrectly. Therefore it is important that the "Transmission oil change" counter is reset.
Note! This only applies when the transmission fluid is changed and when the fluid is changed during repairs to the transmission temperature sensor.
- Ignition on.
Click on the VCT2000 symbol to reset the counter.
Continue - DONE
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DONE - Verification
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Resetting adaptation and oil quality counter
Resetting 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 transmission control module (TCM) 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.
- Gear selector in position P
Click on the VCT2000 symbol to reset the adaptation and counter.
Continue - DONE
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DONE - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the components, reconnect the connectors etc.
- Ignition on.
Test drive the car according to: Test drive schedule, description, B5254T7, AW55-50/51SN Test Drive Schedule, Description
Check that the transmission does not display any obvious mechanical faults.
Note! When test driving, the oil temperature must be above 20 °C.
Was the function OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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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 - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the oil quality and the oil level in the transmission
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