SAFETY PRECAUTIONS
Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG 1598/31 is available for purchase or rental. Certainly you have received an electrical shock once before when touching something made out of metal. The reason for this is the electrostatic charge of the human body. This charge can lead to functional problems by touching the electrical components of the transmission and selector lever mechanism. Touch a grounded object, e.g. a water pipe or a hoist, before working on the electrical components! Do not make direct contact on electrical harness connector terminals! Always switch ignition off before disconnecting or connecting Battery -A-, failure to do so may damage the Direct Shift Gearbox (DSG) Mechatronic -J743-. If special testing equipment is required during road test, note the following
| WARNING | Test equipment must always be secured to the rear seat and operated by a second person. If test and measuring equipment is operated from the passenger seat, the person seated could be injured in the event of an accident involving deployment of the passenger-side airbag. The use of nails, paper clips, or another unauthorized materials to back-probe electrical harness connectors is strictly prohibited and may cause damage to the electrical harness connectors, terminal ends or damage to a component. Use only the manufacturers test lead kit or an equivalent aftermarket test lead kit for back-probing all electrical harness connectors. |
DIRECT SHIFT GEARBOX MECHATRONIC VOLTAGE SUPPLY, CHECKING
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- The Direct Shift Gearbox (DSG) Mechatronic -J743- fuses OK.
- The Power Supply Relay (terminal 15) - J329- OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Selector lever in "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to Preliminary Check
Start diagnosis
Disconnect the Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector -1- by rotating counterclockwise.
Scheme 214
Checking voltage supply, terminal 30
Using a Multimeter, check the Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector terminals for voltage.
| Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector terminals |
|---|
| 11 to 16 |
| 11 to 19 |
Specified value: battery voltage.
If the specified value was not obtained
Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If the wiring and voltage were OK
Voltage supply, terminal 15
Using a Multimeter, check the Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector terminals for voltage.
| Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector terminals |
|---|
| 18 to 16 |
| 18 to 19 |
Specified value: battery voltage.
If the specified value was not obtained
Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If the wiring and voltage were OK
Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
Perform a road test to verify repair.
If the DTC does not return
Repair complete, Generate readiness code. Refer to Readiness Code Description .
End diagnosis.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK
Replace Direct Shift Gearbox (DSG) Mechatronic -J743-. Refer to Direct Shift Gearbox (DSG) Transmission Mechatronic -J743 .
Final procedures
After repair work, the following work steps must be performed in the following sequence
- Check the DTC memory. Refer to «DIAGNOSTIC MODE 03 - READ DTC MEMORY»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe__diagnostic-mode-03-read-dtc) .
- If necessary, erase DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe__diagnostic-mode-04-erase-dtc) .
- If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe) .
End of diagnosis.
DIRECT SHIFT GEARBOX MECHANTRONIC TO ECM, CAN-BUS TERMINAL RESISTANCE, CHECKING
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirement
- A CAN-Bus malfunction was recognized.
- The Engine Control Module (ECM) - J623- Direct Shift Gearbox (DSG) Mechatronic -J743- fuses OK.
- The Direct Shift Gearbox (DSG) Mechatronic -J743- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Function
The Engine Control Module (ECM) -J623- communicates with other CAN-Bus capable control modules.
The control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the CAN-bus is recognized as a malfunction by the Engine Control Module (ECM) -J623- and the other control modules connected to the CAN-bus.
Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Engine Control Module (ECM) -J623-.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to Preliminary Check
Start diagnosis
Disconnect the Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector.
Note. The Engine Control Module (ECM) -J623- must remain connected for the following step.
Using a Multimeter, check the Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector terminals 10 to 15 for resistance.
Specified value: 60 to 72 ohms (at approx. 20° C)
If the specified value was not obtained
Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring
Replace the Engine Control Module (ECM) -J623-.
If the specified value was obtained
Checking wiring
If the manufacturers test box is being used. Perform the following step.
Install the Test Box 105 Pin VAG 1598/31. Refer to WIRING AND COMPONENTS, CHECKING WITH TEST BOX .
If the manufacturers test box is not being used. Perform the following step.
Remove the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .
Using a Multimeter, check the Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T121 for resistance.
| Direct Shift Gearbox (DSG) Mechatronic -J743- electrical harness connector terminals | Engine Control Module (ECM) -J623- electrical connector T94 terminals or test box sockets |
|---|---|
| 15 (Can_Bus Low) | 58 |
| 10 (Can_Bus High) | 60 |
Specified value: 1.5 ohms Max.
If the specified value was not obtained
Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring
Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
Perform a road test to verify repair.
If the DTC does not return
Repair complete, Generate readiness code. Refer to Readiness Code Description .
End diagnosis.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK
Replace the Direct Shift Gearbox (DSG) Mechatronic -J743-.
Final procedures
After repair work, the following work steps must be performed in the following sequence
- Check the DTC memory. Refer to «DIAGNOSTIC MODE 03 - READ DTC MEMORY»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe__diagnostic-mode-03-read-dtc) .
- If necessary, erase the Direct Shift Gearbox (DSG) Mechatronic -J743- memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe__diagnostic-mode-04-erase-dtc) .
- If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe) .
End of diagnosis.
SELECTOR LEVER TO ECM, CAN-BUS TERMINAL RESISTANCE, CHECKING
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirement
- A CAN-Bus malfunction was recognized.
- The Engine Control Module (ECM) - J623- fuses OK.
- The Selector Lever -E313- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Function
The Engine Control Module (ECM) -J623- communicates with the Selector Lever -E313-.
The control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the CAN-bus is recognized as a malfunction by the Engine Control Module (ECM) -J623- and the other control modules connected to the CAN-bus.
Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Engine Control Module (ECM) -J623-.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to Preliminary Check
Start diagnosis
Remove the selector mechanism, far enough to gain access to the Selector Lever -E313- electrical harness connector -A-. Refer to SELECTOR MECHANISM
Disconnect the Selector Lever -E313- electrical harness connector -A-.
Scheme 215
Note. The Engine Control Module (ECM) -J623- must remain connected for the following step.
Using a Multimeter, check the Selector Lever -E313- electrical harness connector terminals 7 to 8 for resistance.
Specified value: 60 to 72 ohms (at approx. 20° C)
If the specified value was not obtained
Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring
Replace the Engine Control Module (ECM) -J623-.
If the specified value was obtained
Checking wiring
If the manufacturers test box is being used. Perform the following step.
Install the Test Box 105 Pin VAG 1598/31. Refer to WIRING AND COMPONENTS, CHECKING WITH TEST BOX .
If the manufacturers test box is not being used. Perform the following step.
Remove the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .
Using a Multimeter, check the Selector Lever -E313- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T121 for resistance.
| Selector Lever -E313- electrical harness connector terminals | Engine Control Module (ECM) -J623- electrical connector T121 terminals or test box sockets |
|---|---|
| 8 (Can_Bus Low) | 58 |
| 7 (Can_Bus High) | 60 |
Specified value: 1.5 ohms Max.
If the specified value was not obtained
Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
Check the wiring connection for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring
Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
Perform a road test to verify repair.
If the DTC does not return
Repair complete, Generate readiness code. Refer to Readiness Code Description .
End diagnosis.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK
Replace the Selector Lever -E313-.
Final procedures
After repair work, the following work steps must be performed in the following sequence
- Check the DTC memory. Refer to «DIAGNOSTIC MODE 03 - READ DTC MEMORY»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe__diagnostic-mode-03-read-dtc) .
- If necessary, erase the Direct Shift Gearbox (DSG) Mechatronic -J743- memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe__diagnostic-mode-04-erase-dtc) .
- If the DTC memory was erased, generate readiness code. Refer to8 «READINESS CODE»(/audi/tt/8j-2006-2010/remont/cooling-fan/#32l-generic-scan-tool-engine-codes-cbra-coupe) .
End of diagnosis.
See also:
• Preliminary Check
• DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
• Readiness Code Description
• Direct Shift Gearbox (DSG) Transmission Mechatronic -J743
• DIAGNOSTIC MODE 03 - READ DTC MEMORY
• READINESS CODE
• WIRING AND COMPONENTS, CHECKING WITH TEST BOX
• ENGINE CONTROL MODULE, REPLACING
• SELECTOR MECHANISM