4T65EV-GT
Checking the gear ratio
Checking the gear ratio
Note! If the car has STC or DSTC, these functions must be disengaged. Press in the STC/DSTC button on the center console. Hold the button in for at least 2 seconds. The LED on the button must go out.
- Ignition off
- Raise the car so that the drive wheels are clear of the ground.
Warning! Ensure that the car is safely raised.
Warning! Check that there are no objects caught in the front tire treads.
- Start the engine
- Read off the gear ratio during shifting.
Move the gear shift selector to position 1. Accelerate carefully until the engine speed (RPM) is approximately 2000 rpm.
Try to maintain a constant engine speed throughout the test.
Note! The gear ratio varies if a constant vehicle speed and engine speed (RPM) are not maintained. This is because the transmission will free wheel.
Then move the gear selector to position 2 within 10 seconds, to position 3 within a further 10 seconds and then to position D (fourth gear).
Check that the shifts are carried out correctly by comparing the selected gear with the gear ratio.
Make a note of the shifting pattern and then compare with the table.
Gear / gear ratio (during normal function)
- 1 / 2.921 (corresponds to gear 1)
- 2 / 1.568 (corresponds to gear 2)
- 3 / 1.000 (corresponds to gear 3)
- D / 0.705 (corresponds to gear 4).
Note! Diagnostic trouble codes (DTCs) may be stored in the ABS system when the rear wheels are stationary and the front wheels rotate. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.
Other information:
- To remove the transmission, see Gearbox, removing Gearbox, Removing
- To install the transmission, see Gearbox, installing Gearbox, Installing
- To replace the control system, see Control system / valve housing, replacing Service and Repair.
Select an alternative
1. Replaced control system or transmission
2. Transmission operating normally.
1 - Resetting the adaptation and oil quality counter
2 - No Fault Found
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Resetting the adaptation and oil 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 - DONE
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DONE - FAULT FOUND
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Verification
Checking diagnostic trouble codes (DTCs)
Erasing diagnostic trouble codes (DTCs)
- Ignition on
- Erase diagnostic trouble codes (DTCs).
Continue - Check the diagnostics number
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Check the diagnostics number
Checking the software
Checking the software
Note! To carry out fault-tracing, the transmission control module (TCM) must be programmed with specific software.
- Ignition on
- Read off the control module diagnostic number.
Check the read off diagnostic number against the diagnostic numbers given in the center table.
If the diagnostic number is included in the table, the control module must be programmed with the latest software.
See the technical journal for information about the most recent software.
Continue - DONE
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DONE - Test driving
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Test driving
Note! Test drive the car according to the driving schedule below to check whether the fault is still active. The test drive is compiled in order to create the conditions in which the diagnostic trouble code (DTC) will be stored again if the fault is active. The TEST MODE function can be used to provoke any diagnostic trouble codes (DTC). The function reduces the conditions for how quickly diagnostic trouble codes (DTCs) are stored in the control module and the test drive becomes easier.
- Start the engine
- Activate TEST MODE.
Note! Do not switch off the engine!
- Disconnect the VIDA station. Test drive the car as described below.
Warning! Please observe traffic regulations.
Note! Before test driving, the transmission should be at operating temperature, approximately 80-90°C.
Move the gear selector to position 1. Accelerate carefully until the speed is just above 55 km/h.
Maintain a steady speed for approximately 20 seconds.
Shift the gear selector to positions 2, 3 and D. Maintain a steady speed for approximately 20 seconds after each up-shift.
Criteria for diagnostic trouble code (DTC):
- The gear selector is in the desired gear position for at least 15 seconds
- Speed above 30 km/h
- Positive engine torque (no engine braking)
- Engine speed in excess of 2000 rpm.
Continue - Checking diagnostic trouble codes (DTCs)
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Checking diagnostic trouble codes (DTCs)
- Ignition on
- Read off diagnostic trouble codes (DTCs).
Is diagnostic trouble code (DTC) TCM 000B or TCM-000C stored?
Yes - DTC
No - NODTC
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DTC - Fault-tracing information
NODTC - 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 gear ratio
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