Fault-Tracing

Fault-tracing TCM-012C

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. If the oil level is low, check the transmission for leakage, then top up with oil.
Check the quality of the oil.
Replace the transmission fluid if the fluid smells burnt.

Other information:
- Oil level, checking Checking Oil Level
- Oil grade, checking Oil Grade, Checking
- Transmission fluid, replacing Transmission Fluid, Replacing






Continue - Checking the neutral check

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Checking the neutral check




- Start the engine.
Move the gear selector to position D. Drive a short distance, stop and brake the wheels. Allow the engine to run at idle speed and hold the brake pedal depressed. Wait until the neutral check has been activated (it can take up to 30 seconds).
Quickly depress the accelerator and at the same time check if the transmission slips abnormally at "take off".
If the transmission slips abnormally, the transmission's control system must be replaced.

Caution! Please observe traffic regulations.

Other information:
- Control system, replacing Control System, Replacing

Was the function OK?

Yes - Checking solenoid SLT

No - Resetting adaptation

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Checking solenoid SLT

Note! The transmission must not be colder than room temperature when activated.




- Ignition on.
- Activate solenoid SLT.
The solenoid must "click" on activation (use a stethoscope to hear the sound more clearly) and the current must oscillate between 100 and 1000 mA. There is an internal mechanical fault in the transmission if the current does not change and no clicking sound is heard. Replace the control system.

Hint: Also check that other solenoids click at activation.





Was the function OK?

Yes - Checking solenoid SLC1

No - Resetting adaptation

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Resetting adaptation





Resetting adaptation

Resetting adaptation and counter for "Transmission oil, changing"

Hint: The transmission has torque-controlled, adaptive pressure control. The pressure control means that the transmission itself controls the pressure during each shift sequence in order to avoid harsh shifting. Each shift is assessed by the transmission control module (TCM) and is stored in the internal memory, which results in compensation for wear in the transmission and clutch. In order for the transmission to function correctly after repair, it is important to reset the adaptation in the memory. Since the oil is changed during the repair, the counter for "Transmission oil, change" shall also be reset. If the counter is not reset when draining/changing oil, there is a risk that a diagnostic trouble code may be generated under incorrect conditions.

Note! This applies only if the transmission or one of the components in the transmission have been replaced.




- Ignition on
Activate reset of the adaptation and the counter by clicking on the symbol for VCT2000.






Continue - DONE

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DONE - Verification

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Checking solenoid SLC1

Note! The transmission must not be colder than room temperature when activated.




- Ignition on.
- Activate solenoid SLC1.
The solenoid must "click" on activation (use a stethoscope to hear the sound more clearly) and the current must oscillate between 100 and 1000 mA. There is an internal mechanical fault in the transmission if the current does not change and no clicking sound is heard. Replace the control system.





Was the function OK?

Yes - No Fault Found

No - Resetting adaptation

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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 oil quality and the oil level in the transmission

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Verification




Verification

Verification




- Reconnect the connectors, reinstall components etc.
- Start the engine.
Move the gear selector to position D. Drive a short distance, stop and brake the wheels. Allow the engine to run at idle speed and hold the brake pedal depressed. Wait until the neutral check has been activated (it can take up to 30 seconds).
Quickly depress the accelerator and at the same time check if the transmission slips abnormally at "take off".

Was the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - VERIFIED

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