Fault-Tracing

Fault tracing

Checking the gear system





Fault-tracing information

Checking the gear system
Problems that the customer may experience are hard shifts or slipping shifts. The following test-drive contains several different driving situations that may provoke these symptoms if the transmission is damaged.

Note! It is important that the transmission oil is above 70 °C before the test-drive starts!

Test 1
1. Driving at 100 km/h, 6th gear.
2. Perform a kickdown to 4th gear.
3. Let the transmission automatically shift up to 5th gear.
4. Let up the accelerator pedal and let the transmission shift up to 6th gear.

Test 2
1. Driving at 100 km/h, 6th gear.
2. Slight uphill grade, press accelerator pedal until you obtain shifting 6-5, not kickdown.

Test 3
1. Driving at 80 km/h.
2. Move the gear selector to position M and engage 6th gear.
3. Perform a kickdown and shift 6-5, 5-4, 4-3 at the same time.
4. Then upshift immediately to 6th gear.

Test 4
1. Stationary vehicle, engine running, parking brake applied, brake activated with left foot, gear selector in position R.
2. Press down the accelerator pedal (brake still activated).

Note! Let up the accelerator pedal in case of noise or slipping.

Test 5
1. Stationary vehicle, engine running, parking brake applied, brake activated with left foot, gear selector in position D.
2. Press down the accelerator pedal (brake still activated).

Note! Let up the accelerator pedal in case of noise or slipping.

If the symptoms hard shifts or slipping shifts arise during the test-drive, the transmission's control system must be replaced.

Other information
- Control system, replacing Control System, Replacing

Is the function OK?

Yes - DONE

No - Fault Found

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FAULT FOUND - Resetting adaptation and the fluid quality counter

DONE - Checking solenoids

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Checking solenoids




- Ignition on
- Activate the solenoids by clicking on the symbol for VCT2000.
Select a solenoid and read off the current through the solenoid's circuit. The current should shift between approx. 0 and 1000 mA.










Does the current oscillate?

Yes - Checking oil quality and oil level in transmission

No - Checking the wiring and component

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Checking oil quality and oil level in transmission

Note! The transmission oil's quality and level are extremely important for the function of the transmission. Therefore it is important that these are correct. In addition, the oil level is dependent on oil temperature.




- Ignition on
- Read off the oil's temperature.
Check the transmission's oil level. If it is low, check the transmission for leaks and then top off the oil.
Check the oil's quality.
If the oil smells burnt, change transmission oil.

Other information
- Oil level, checking Checking Oil Level
- Oil grade, checking Oil Grade, Checking
- Checking internal components of the transmission Checking Internal Components of the Transmission

Select one of the following options:
1. No defect found.
2. Transmission oil changed, level low or quality poor.









1 - Checking the wiring and component

2 - Resetting adaptation and the fluid quality counter

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Checking the wiring and component








- Ignition off
- Open the gearbox control system
Check connector B (22-pin) for the transmission control module (TCM). Check for damaged or pressed in pins. Check for contact resistance and oxidation.

Hint: Check solenoid SLT, SLC1, SLC2, SLC3 and SLB1 according to: Checking internal components of the transmission Checking Internal Components of the Transmission





If no defects were found on connectors or cables, replace the transmission.
Remedy as necessary.

Other information
- Gearbox, removing Transmission, Removing
- Installing the gearbox Transmission, Installation
- Cover control system, replacing Cover Control System, Replacing
- Cable harness, control system, gearbox, replacing Service and Repair
- To access connector B, see: Transmission control module (TCM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals





Was a fault detected?

Yes - Resetting adaptation and the fluid quality counter

No - Replacing the transmission

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Replacing the transmission
Previous tests indicate an internal malfunction in the transmission.

Other information
- Gearbox, removing Transmission, Removing
- Installing the gearbox Transmission, Installation






Continue - Resetting adaptation and the fluid quality counter

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Resetting adaptation and the fluid quality counter





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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Verification




Verification

Verification

Note! When the transmission's control module has been removed and reinstalled, it is important that the gear position sensor is calibrated. Select vehicle communication and calibrate gear position sensor.

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








- Ignition off
- Reinstall the components, reconnect the connectors etc.
Test drive the vehicle following: Test drive schedule, description Test Drive Schedule, Description
Check that the transmission does not display any obvious function faults.

Note! When test driving, the oil temperature must be above 20 °C.

Is 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the gear system

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