Fault-Tracing
Fault tracing
Checking the function
- Start the engine and allow it to idle.
- Read off the transmission input speed.
Read off the transmission input speed.
If the transmission input speed updates correctly it means that the fault was present previously but is not active now. There is an intermittent fault.
If the transmission input speed does not update correctly it means that the fault is permanent.
Continue - Checking wiring and sensors
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Checking wiring and sensors
- Ignition off
- Connect the breakout box to the transmission.
- Expose the control system of the transmission.
- Disconnect the connector for the transmission speed input sensor.
Check the wiring for the transmission input speed sensor. Connect an ohmmeter between terminal #B12 (#A12) and input speed sensor terminal #2 and between terminal #B13 (#A13) on the breakout box and input speed sensor terminal #1. The resistance must be 0 ohms. Check the wiring. Check for short-circuits to adjacent cables in the cable harness.
Check that the rpm sensor for input rpm is not loose and that the sensor is installed correctly.
Hint: If no defects were found on the cables, check the rpm sensor for input rpm according to: Checking internal components of the transmission Checking Internal Components of the Transmission
Remedy as necessary.
Other information
- Connecting the breakout box Connecting Breakout Box, Transmission Control Module (TCM)
- Signal description Signal Description. Transmission Control Module (TCM)
- To access the connector, see: Gearbox input speed sensor, replacing Gearbox Input Speed Sensor, Replacing
- Checking wiring and terminals Checking Wiring And Terminals
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 connectors, components etc.
- Start the engine and allow it to idle.
- Read off the transmission's input rpm.
Increase the rpm and check that the rpm is updated. Compare to the engine rpm.
Is the rpm updated?
Yes - VERIFIED
No - VERIFICATION FAILEDPAPER
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VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
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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 function
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