Fault-Tracing
Fault tracing
Checking the diagnostic trouble codes (DTCs)
Any other diagnostic trouble codes for the transmission control module (TCM) must be remedied first because one of them may have caused diagnostic trouble code TCM-0100 or TCM-0240 to be stored.
Were other diagnostic trouble codes (DTCs) stored?
Yes - DONE
No - Checking the gear system
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Check contact resistance and oxidation
- Ignition off
- Check the connectors of the transmission and the connector for the transmission control module (TCM). Check for contact resistance and oxidation.
- Reconnect the connectors, components, etc.
- Calibrate the gear shift position sensor for the transmission.
Hint: Select Diagnostics/car communication.
- 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.
Other information
- To access transmission connectors, see: Transmission control module (TCM), replacing Service and Repair
Is the transmission function OK?
Yes - Fault Found
No - Replacing the control system
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Replacing the control system
Fault-tracing indicates an internal fault in the transmission.
Other information
- Control system, replacing Control System, Replacing
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
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the components, reconnect the connectors etc.
- The gear shift position sensor for the transmission must be calibrated if the control module has been disconnected.
Hint: Select Diagnostics/car communication.
- Start the engine.
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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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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DONE - Check contact resistance and oxidation
FAULT FOUND - Replacing the control system
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