3.2l - Multiport Fuel Injection (mfi) - Engine Code(s): Cbra (coupe) Audi TT 8J

MOTRONIC FUEL INJECTION SYSTEM, SERVICING

For all Motronic fuel injection system component locations. Refer to Engine Control Module .

For all Motronic fuel injection system removal/installation procedures and torque specifications. Refer to Engine Control Module .

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.

SAFETY PRECAUTIONS

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system. Note the following

1. Always switch off ignition before disconnecting or connecting lines of the fuel injection and ignition system, including test leads.
2. During some of the tests, a Diagnostic Trouble Code (DTC) may be recognized and stored by the control module. At the end of all tests and repairs, the DTC memory should be checked and, if necessary, erased. After erasing the DTC memory, a readiness code must be generated for the engine control module.
3. Always switch ignition off before cleaning engine.

Observe the following if test and measuring instruments are required during a test drive

CLEAN WORKING CONDITIONS

Even minor contaminations can lead to malfunctions in the fuel injection system. When working on the fuel supply/injection system, pay careful attention to the following rules for cleanliness

1. Thoroughly clean all unions and adjacent areas with engine or brake cleaner and dry before disconnecting.
2. Plug open lines and connections immediately with appropriate protective caps.
3. Place removed parts on a clean surface and cover. Use lint-free cloths.
4. Install clean components: Remove replacement parts immediately prior to installation. Do not use parts that have been stored unpacked (e.g. in tool boxes etc.).
5. When the system is open: Do not work with compressed air. Do not move vehicle unless absolutely necessary.
6. Separated electrical connectors: Protect from dirt and moisture. Make sure connections are dry when reconnecting.

TECHNICAL DATA

OXYGEN SENSOR HEATER BEFORE CATALYTIC CONVERTER, CHECKING

Oxygen Sensor (O2S) Heater -Z19-, Checking

Note. Oxygen Sensor (O2S) Heater -Z19- is part of Heated Oxygen Sensor (HO2S) -G39- and cannot be replaced separately. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) --, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB2- OK.
2. Fuel Pump (FP) 2 Relay -J49- OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Remove the engine cover with air filter. Refer to REMOVAL AND INSTALLATION .

Checking internal resistance

Disconnect the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector -2-.

Scheme 48

Using a multimeter, check the Heated Oxygen Sensor (HO2S) -- terminals 3 to 4 for an open circuit.

Scheme 49

Specified value: 2.5 to 10.0 ohms (at approx. 20° C)

If the specification was not obtained

Replace the 2- Heated Oxygen Sensor (HO2S) -G39- or the 1 Heated Oxygen Sensor (HO2S) 2 -G108-.

If the specification was obtained

Checking voltage supply

Using a multimeter, check the Heated Oxygen Sensor (HO2S) -- electrical harness connector terminal 4 to ground (GND) for voltage.

Scheme 50

Specified value: Battery voltage.

If the specification was not obtained

Check the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector terminal 4 to the Fuel Pump (FP) 2 Relay -J49- socket 2/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module

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 Heated Oxygen Sensor (HO2S) -- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T81 for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

Oxygen Sensor (O2S) 2 Heater -Z28-, Checking

Note. Oxygen Sensor (O2S) 2 Heater -Z28- is part of Heated Oxygen Sensor (HO2S) 2 -G108- and cannot be replaced separately. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) --, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB4- OK.
2. Fuel Pump (FP) 2 Relay -J49- OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Remove the engine cover with air filter. Refer to REMOVAL AND INSTALLATION .

Checking internal resistance

Disconnect the Heated Oxygen Sensor (HO2S) 2 -G108- electrical harness connector -1-.

Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 -G108- terminals 3 to 4 for resistance.

Specified value: 2.5 to 10.0 ohms (at approx. 20° C)

If the specification was not obtained

Replace the Heated Oxygen Sensor (HO2S) 2 -G108-. Refer to DESCRIPTION AND OPERATION .

If the specification was obtained

Checking voltage supply

Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector terminal 4 to ground (GND) for voltage.

Specified value: Battery voltage.

If the specification was not obtained

Check the Heated Oxygen Sensor (HO2S) 2 -G108- electrical harness connector terminal 4 to the Fuel Pump (FP) 2 Relay -J49- socket 2/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module .

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 Heated Oxygen Sensor (HO2S) 2 -G108- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T81 for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

OXYGEN SENSOR HEATER AFTER CATALYTIC CONVERTER, CHECKING

Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater - Z29-, Checking

Note. Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater - Z29- is part of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- and cannot be replaced separately. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) --, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB2- OK.
2. Fuel Pump (FP) 2 Relay -J49- OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Remove the retaining screws -1 and 2- and the cover.

Scheme 51

Checking internal resistance

Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector -1-.

Scheme 52

Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- terminals 1 to 2 for resistance.

Scheme 53

Specified value: 1.0 to 20.0 ohms (at approx. 20° C)

If the specification was not obtained

Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-. Refer to DESCRIPTION AND OPERATION .

If the specification was obtained

Checking voltage supply

Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector terminal 1 to ground (GND) for voltage.

Scheme 54

Specified value: Battery voltage.

If the specification was not obtained

Check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector terminal 1 to the Fuel Pump (FP) 2 Relay -J49- socket 2/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module .

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 Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T81 for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

Oxygen Sensor (O2S) 2 (behind Three Way Catalytic Converter (TWC)) Heater -Z30-, Checking

Note. Oxygen Sensor (O2S) 2 (behind Three Way Catalytic Converter (TWC)) Heater -Z30- is part of Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- and cannot be replaced separately. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) --, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB4- OK.
2. Fuel Pump (FP) 2 Relay -J49- OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Remove the retaining screws -1 and 2- and the cover.

Checking internal resistance

Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector -2-.

Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- terminals 1 to 2 for resistance.

Specified value: 1.0 to 20.0 ohms (at approx. 20° C)

If the specification was not obtained

Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-. Refer to DESCRIPTION AND OPERATION .

If the specification was obtained

Checking voltage supply

Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector terminal 1 to ground (GND) for voltage.

Specified value: Battery voltage.

If the specification was not obtained

Check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector terminal 1 to the Fuel Pump (FP) 2 Relay -J49- socket 2/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Fuel Injectors, Checking Injection Quantity, Spray Pattern and for Leaks .

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 Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T81 for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

MASS AIR FLOW SENSOR, CHECKING

Note. Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor -G70-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB3- OK.
2. Fuel Pump (FP) 2 Relay -J49- OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Coolant Temperature at least 80° C.
9. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Connect the scan tool.

Start engine and let it run at idle.

Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor -G70- at idle

End diagnosis and switch ignition off.

If the specified value was obtained, but the DTC memory has a DTC concerning the Mass Air Flow (MAF) Sensor -G70

Check the voltage supply of the Mass Air Flow (MAF) Sensor -G70-.

If specified value was not obtained

Check the wiring of the Mass Air Flow (MAF) Sensor -G70-.

Checking voltage supply

Disconnect the Mass Air Flow (MAF) Sensor -G70- electrical harness connector -1-.

Scheme 55

Start the engine and let it run at idle.

Using a multimeter, check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminal 2 to engine Ground (GND).

Scheme 56

Specified value: battery voltage.

Switch the ignition off.

If specified value was not obtained

Check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminal 2 to the Fuel Pump (FP) 2 Relay -J49- terminal 2/87 for an open circuit, a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

Checking electrical circuit

If the manufacturers test box is being used. Perform the following step.

Install the Test Box. Refer to Fuel Injectors, Checking Injection Quantity, Spray Pattern and for Leaks .

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 Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminals for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

Replace Mass Air Flow (MAF) Sensor -G70-. Refer to MASS AIR FLOW SENSOR .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

THROTTLE VALVE CONTROL MODULE, CHECKING

Note. Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor -J338-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) - J623- fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
5. A/C switched off.
6. Ground (GND) connections between engine/transmission/chassis OK.
7. Throttle valve must not be damaged or dirty.
8. Coolant Temperature at least 80 °C.

Function

Throttle valve operation occurs by an electric motor (Throttle Drive (for Electronic Power Control (EPC)) -G186-) in Throttle Valve Control Module - J338-. It is operated by Engine Control Module (ECM) -J623- according to specifications of Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185 -.

Components of Throttle Valve Control Module -J338

1. Throttle Drive (for Electronic Power Control (EPC)) -G186
2. Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) -G187
3. Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) -G188

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS =>

Start diagnosis

Connect the scan tool.

Switch ignition on.

Using the scan tool, check the throttle valve position (absolute) at idle stop

Slowly depress the accelerator pedal to Wide Open Throttle (WOT) stop while observing the percentage display. The percentage display must increase uniformly.

Using the scan tool, check the throttle valve position (absolute) at Wide Open Throttle (WOT) stop

End diagnosis and switch ignition off.

If the specified values are not obtained

Remove the air hose -arrows-.

Disconnect the Throttle Valve Control Module -J338- electrical harness connector -3-.

Scheme 57

Checking internal resistance

Using a multimeter, check the Throttle Drive (for Electronic Power Control (EPC)) -G186- at the Throttle Valve Control Module -J338- terminals 3 to 5 for resistance.

Specified value: 1.0 to 5.0 ohms (at 20 °C)

If the specification was not obtained

Replace the Throttle Valve Control Module - J338-. Refer to THROTTLE VALVE CONTROL MODULE .

If the specification was obtained

Check the voltage supply of the Throttle Valve Control Module -J338- to the Engine Control Module (ECM) -J623- THROTTLE VALVE CONTROL MODULE, CHECKING .

CHECKING VOLTAGE SUPPLY AND WIRING

Switch the ignition on.

Using a Multimeter --, check the Throttle Drive (for Electronic Power Control (EPC)) -G186- at the Throttle Valve Control Module -J338- electrical harness connector terminals 2 to 6 for voltage.

Scheme 58

Specified value: at least 4.5 V

Switch the ignition off.

If the specification was obtained

Replace the Throttle Valve Control Module - J338-. Refer to THROTTLE VALVE CONTROL MODULE .

If the specification was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module .

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 Throttle Drive (for Electronic Power Control (EPC)) -G186- at Throttle Valve Control Module -J338- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T40 terminals for resistance.

Specified value: 1.5 ohms max.

If the specification is not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

If necessary, repair the faulty wiring connection.

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If no malfunction is detected in the wiring and if the voltage supply was not 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

ENGINE COOLANT TEMPERATURE SENSOR, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor -G62-.

Special tools and workshop equipment required

1. Multimeter.
2. jumper wire.
3. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) - J623- fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
5. A/C switched off.
6. Ground (GND) connections between engine/transmission/chassis OK.
7. Ignition switched off.
8. Engine cold.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Connect the scan tool.

Switch the ignition on.

Using the scan tool, check the coolant temperature

If the specified value is not obtained

Continue test according to the following table

If the specified value was obtained

Start the engine and let it run at idle.

The temperature value must increase uniformly in increments of 1.0° C.

If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is intermittent.

Replace the Engine Coolant Temperature (ECT) Sensor - G62-. Refer to Coolant Thermostat Housing Assembly Overview .

Checking internal resistance

Disconnect the Engine Coolant Temperature (ECT) Sensor -G62- electrical harness connector -arrow-.

Scheme 59

Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor -G62- terminals 1 to 2 for resistance.

Scheme 60

Use the chart below for the specified values

1. Area A: Resistance values 0 to 50° C.
2. Area B: Resistance values 50 to 100° C.

Specified values

Scheme 61

1. Range A, 30° C equals a resistance of 1.5 to 2.0 kohms
2. Range B, 80° C equals a resistance of 275 to 375ohms

If any of the specified values was not obtained

Replace the Engine Coolant Temperature (ECT) Sensor - G62-. Refer to Coolant Thermostat Housing Assembly Overview .

TESTING IF DISPLAY IS APPROX. - 40.0 °C

Disconnect the Engine Coolant Temperature (ECT) Sensor -G62- electrical harness connector -arrow-.

Using a jumper wire, connect the Engine Coolant Temperature (ECT) Sensor -G62- electrical harness connector terminals 1 to 2.

Check the value indicated on the scan tool display.

Scheme 62

If the value jumps to approx. 140.0° C

End diagnosis and switch the ignition off.

Replace the Engine Coolant Temperature (ECT) Sensor - G62-. Refer to Coolant Thermostat Housing Assembly Overview .

If indication remains at approx. -40.0° C

TESTING IF DISPLAY APPROX. 140.0° C

Disconnect the Engine Coolant Temperature (ECT) Sensor -G62- electrical harness connector -arrow-.

If indication jumps to approx. -40.0° C

End diagnosis and switch ignition off.

Replace the Engine Coolant Temperature (ECT) Sensor - G62-. Refer to Coolant Thermostat Housing Assembly Overview .

If indication remains at approx. 140.0° C

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module .

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 Engine Coolant Temperature (ECT) Sensor - G62- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T40 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

ENGINE COOLANT TEMPERATURE SENSOR ON RADIATOR, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor (on Radiator) -G83-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) - J623- fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
5. A/C switched off.
6. Ground (GND) connections between engine/transmission/chassis OK.
7. Ignition switched off.
8. Engine cold.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Checking internal resistance

Disconnect the Engine Coolant Temperature (ECT) Sensor (on Radiator) -G83- electrical harness connector -1-.

Scheme 63

Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor (on Radiator) -G83- terminals 1 to 2 for resistance.

Use the chart below for the specified values

1. Area A: Resistance values 0 to 50° C.
2. Area B: Resistance values 50 to 100° C.

Specified values

1. Range A, 30° C equals a resistance of 1.5 to 2.0 kohms
2. Range B, 80° C equals a resistance of 275 to 375ohms

If any of the specified values was not obtained

Replace the Engine Coolant Temperature (ECT) Sensor (on Radiator) -G83-.

If any of the specified values was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module .

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 Engine Coolant Temperature (ECT) Sensor (on Radiator) -G83- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, lose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected 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 => Readiness Code Description .

End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK

Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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.

COOLANT PUMP, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Coolant Pump -V51-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SA1- OK.
2. Fuse -SA4- OK.
3. The Coolant Circulation Pump Relay -J151- OK.
4. Suppressor -C24- OK
5. Battery voltage at least 12.5 volts.
6. All electrical consumers such as, lights and rear window defroster, switched off.
7. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
8. A/C switched off.
9. Ground (GND) connections between engine/transmission/chassis OK.
10. Ignition switched off.
11. Engine cold.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Disconnect the Coolant Pump -V51- electrical harness connector -3-.

Scheme 64

Checking voltage

Switch the ignition on.

Using a multimeter --, check the Coolant Pump -V51- electrical harness connector terminal 2/31 to Ground (GND) for voltage.

Specified value: battery voltage.

Switch the ignition off.

If the specified value was not obtained

Check the wiring from the Coolant Pump -V51- electrical connector terminal 2/31 to the Generator (GEN) -C- terminal B (+) for a short circuit to Ground (GND), or an open circuit.

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking Ground (GND)

Using a multimeter --, check the Coolant Pump -V51- electrical harness connector terminal 1 to Coolant Circulation Pump Relay -J151- socket 7/87 for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to, Battery (+), or an open.

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and the voltage was OK

Replace the Coolant Pump -V51-. Refer to Coolant Pump .

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 => Readiness Code Description .

End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the Ground (GND) was not OK

Replace the Coolant Circulation Pump Relay -J151-.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

ENGINE SPEED SENSOR, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Engine Speed (RPM) Sensor -G28-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) - J623- fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
5. A/C switched off.
6. Ground (GND) connections between engine/transmission/chassis OK.
7. Ignition switched off.

Function

The Engine Speed (RPM) Sensor -G28- detects RPM and reference marks. Without an engine speed signal, the engine will not start. If the engine speed signal fails while the engine is running, the engine will stop immediately.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS =>

Start diagnosis

Function test

Connect the scan tool.

Switch the ignition on.

Using the scan tool, check the engine speed

End diagnosis and switch ignition off.

If the specified value was not obtained

Checking internal resistance

Disconnect the Engine Speed (RPM) Sensor -G28- electrical harness connector -1-.

Scheme 65

Using a multimeter, check the Engine Speed (RPM) Sensor -G28- terminals 2 to 3 for resistance.

Scheme 66

Specified value: 0.7 to 1000 kOhm

Check Engine Speed (RPM) Sensor -G28- terminals 1 to 2 and 1 to 3 for short circuits.

Specified value: infinity (infinity)

If any of the specified values are not obtained

Replace the Engine Speed (RPM) Sensor -G28-.

If the specified values are obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the Test box. Refer to Engine Control Module

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 Engine Speed (RPM) Sensor -G28- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T40 terminals for resistance.

Scheme 67

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check wire shield for proper ground.

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

Remove the Engine Speed (RPM) Sensor -G28- and check the sensor wheel for proper seating, damage and run-out.

If the sensor wheel is 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

INTAKE MANIFOLD TUNING VALVE, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB7- OK.
2. The Motronic Engine Control Module (ECM) Power Supply Relay -J271- OK.
3. The parking brake engaged.
4. The battery voltage at least 12.5 V.
5. The selector lever of automatic transmission in position "P" or "N".
6. All electrical consumers switched off (radiator fan must NOT run during test).
7. A/C switched off.
8. The fuel tank at least 1 / 4 filled.
9. The ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Disconnect the Intake Manifold Runner Control (IMRC) Valve -N316- electrical harness connector -arrow-.

Scheme 68

Checking internal resistance

Using a Multimeter --, check the Intake Manifold Tuning (IMT) Valve -N156- terminals 1 to 2 for resistance.

Scheme 69

Specified value: 450 to 1000 ohms.

If the specified value was not obtained

Replace the Intake Manifold Tuning (IMT) Valve -N156-.

If the specified value was obtained

Checking voltage

Crank the engine.

Using a Multimeter --, check the Intake Manifold Tuning (IMT) Valve -N156- electrical harness connector terminal 1 to ground (GND) for voltage.

Scheme 70

Specified value: battery voltage.

Switch the ignition off.

If the specified value was not obtained

Check the wiring from the Intake Manifold Tuning (IMT) Valve -N156- electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay -J271- socket 2/87 for a short circuit to Ground (GND), or an open circuit.

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module

If the manufacturers test box is not being used. Perform the following step.

Remove the Motronic Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Using a multimeter --, check the Intake Manifold Tuning (IMT) Valve -N156- electrical harness connector terminal 2 to the Engine Control Module (ECM) -J623- electrical harness connector T40 terminal 121 for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

FUEL INJECTORS, CHECKING

The following test procedure is used to diagnose Fuel Injectors -N30, N31, N32, N33, N83, N84-.

Special tools and workshop equipment required

1. Multimeter.
2. Diode test lamp (12V).
3. Wiring diagram.

Test requirements

1. Fuse -SC21- OK.
2. Fuse -SC29- OK.
3. Power Supply Relay (terminal 50) -J682- OK.
4. Battery voltage at least 12.5 volts.
5. All electrical consumers such as, lights and rear window defroster, switched off.
6. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
7. A/C switched off.
8. Ground (GND) connections between engine/transmission/chassis OK.
9. Ignition switched off.

Observe safety precautions.

Observe rules for cleanliness.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Remove the Fuel Injector -- electrical harness retaining screws -arrows-.

Scheme 71

Remove the Fuel Injector -- electrical harness -arrows- from the fuel rail.

Scheme 72

Disconnect the Fuel Injector -- electrical harness connectors -1, 2, 3, 4, 5, 6- from the Fuel Injectors --.

Checking internal resistance

Using a multimeter, check the Fuel Injector -- electrical terminals 1 to 2 for resistance.

Scheme 73

Specified value: 12.0 to 20.0 ohms (at approx. 20° C)

If the specified value was not obtained

Replace the faulty Fuel Injector --. Refer to Fuel Injectors

If the specified value was obtained

Checking activation

Connect a diode test lamp (12V) to the electrical harness connector terminals 1 and 2 of the Fuel Injector -- to be tested.

Scheme 74

Operate the starter and test the activation of the Fuel Injector --.

LED should flicker.

Switch the ignition off.

If LED flickers

Replace the faulty Fuel Injector --. Refer to Fuel Injectors .

If LED does not flicker

Checking voltage

Using a Multimeter --, check the Fuel Injector -- electrical harness connector terminal 1 to ground (GND) for voltage.

Operate the starter.

Specified value: Battery voltage.

If the specification is not obtained

Check the wiring from the Fuel Injector -- electrical harness connector terminal 1 to the Battery (+) 1 -- in the interior wiring harness for a short circuit to Ground (GND), or an open circuit.

Scheme 75

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Fuel Injectors, Checking Injection Quantity, Spray Pattern and for Leaks .

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 Fuel Injector -- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T40 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification is not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

If no malfunction is detected 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

HEATED OXYGEN SENSOR BEFORE CATALYTIC CONVERTER, CHECKING

Heated Oxygen Sensor (HO2S) -G39-, Checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) -G39-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB2- OK.
2. Engine Control Module (ECM) -J623- fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Perform the function test in Diagnostic Mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .

If specified values are obtained

End diagnosis and switch the ignition off.

If the specified values are not obtained

Checking primary voltage

Disconnect the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector -2-.

Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector terminals 1 to 5 for voltage.

Specified value: 0.400 to 0.500 Volts

Switch the ignition off.

If the specified value was not obtained

Replace the Heated Oxygen Sensor (HO2S) -G39-. Refer to REMOVAL AND INSTALLATION

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module

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 Heated Oxygen Sensor (HO2S) -G39- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

Heated Oxygen Sensor (HO2S) 2 -G108-, Checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) 2 -G108-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB4- OK.
2. Engine Control Module (ECM) -J623- fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Perform the function test in Diagnostic Mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .

If specified values are obtained

End diagnosis and switch the ignition off.

If the specified values are not obtained

Checking primary voltage

Disconnect the Heated Oxygen Sensor (HO2S) 2 -G108- electrical harness connector -1-.

Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 -G108- electrical harness connector terminals 1 to 5 for voltage.

Specified value: 0.400 to 0.500 Volts

Switch the ignition off.

If the specified value was not obtained

Replace the Heated Oxygen Sensor (HO2S) 2 -G108-. Refer to REMOVAL AND INSTALLATION

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module

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 Heated Oxygen Sensor (HO2S) 2 -G108- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

OXYGEN SENSOR AFTER CATALYTIC CONVERTER, CHECKING

Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, Checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-.

Test requirements

1. Fuse -SB2- OK.
2. Engine Control Module (ECM) -J623- fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Perform the function test in Diagnostic Mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .

If specified values are obtained

End diagnosis and switch the ignition off.

If the specified values are not obtained

Remove the retaining screws -1 and 2- and the cover.

Checking primary voltage

Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector -1-.

Switch the ignition on.

Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector terminals 3 to 4 for voltage.

Specified value: 0.400 to 0.500 Volts

Switch the ignition off.

If the specified value was obtained

Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130-. Refer to REMOVAL AND INSTALLATION

If the specified value was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module

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 Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-, Checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-.

Test requirements

1. Fuse -SB4- OK.
2. Engine Control Module (ECM) -J623- fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Perform the function test in Diagnostic Mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .

If specified values are obtained

End diagnosis and switch the ignition off.

If the specified values are not obtained

Remove the retaining screws -1 and 2- and the cover.

Checking primary voltage

Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector -2-.

Switch the ignition on.

Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector terminals 3 to 4 for voltage.

Specified value: 0.400 to 0.500 Volts

Switch the ignition off.

If the specified value was obtained

Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-. Refer to REMOVAL AND INSTALLATION .

If the specified value was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module

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 Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminals for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

Check the electrical harness connector 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 => 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 Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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

ENGINE CONTROL MODULE

Engine Control Module (ECM) -J623- regulates fuel injection, Throttle Valve Control Module -J338-, oxygen sensor regulation, ignition, knock control, Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-, engine speed limitation through fuel injectors or Fuel Pump (FP) Relay -J17- as well as On Board Diagnostic (OBD).

ENGINE CONTROL MODULE VOLTAGE SUPPLY, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. wiring diagrams.

Test requirements

1. Fuse -SD3- OK.
2. Fuse -SC36- OK.
3. Motronic Engine Control Module (ECM) Power Supply Relay -J271- OK.
4. Power Supply Relay (terminal 50) -J682- OK.
5. The Ground (GND) connections at the engine and transmission OK.
6. The battery voltage at least 12.5 V.
7. The generator OK.

Start diagnosis

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Engine Control Module .

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 .

Checking voltage supply

Using a Multimeter, check the following wiring connection for voltage.

Specified value: 12.5 V

If the specified value was not obtained

Check the Engine Control Module (ECM) -J623- electrical harness connector terminal T81/62 to the Battery -A- (+) for an open circuit or short to Ground (GND).

Check the electrical harness connectors for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking switched voltage supply

Switch the ignition on.

Using a Multimeter --, check the following wiring connection for voltage.

Specified value: 12.5. battery voltage.

Switch the ignition off.

If the specified value was not obtained

Check the Engine Control Module (ECM) -J623- electrical harness connector terminal T81/28 to the Voltage Regulator (VR) -C1- terminal DF for an open circuit or a short to Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Switch the ignition on.

Using a Multimeter, check the following wiring connection for voltage.

Specified value: 12.5 V

Switch the ignition off.

If the specified value was not obtained

Check the Engine Control Module (ECM) -J623- electrical harness connector terminal T81/21 to Battery -A- (+) connection 1 for an open circuit or short to Ground (GND).

Check the electrical harness connectors for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking Ground (GND)

Using a Multimeter --, check the following wiring connections for resistance.

Specified value: 1.5 ohms.

If any of the specified values are not obtained

Check the Engine Control Module (ECM) -J623- electrical harness connector terminals to the following Ground (GND) locations for an open circuit or a short to Battery (+).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK

Perform a road test to verify any electrical repairs.

If the fault does not return

Repair complete, Generate readiness code. Refer to READINESS CODE .

End diagnosis.

If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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 diagnosis.

ENGINE CONTROL MODULE, REPLACING

Removing

Special tools and workshop equipment required

1. Heat gun.

Note. When the Engine Control Module (ECM) -J623- electrical harness connectors are disconnected, the adaptation values are erased and the DTC memory content remains intact.

Work procedure

Check the identification of the previous Engine Control Module (ECM) -J623- as follows

Connect the scan tool.

Switch the ignition on.

Using the scan tool, select "Vehicle information".

Select " Calibration Identification" in vehicle information.

The electronic control module identification number will be displayed, e.g. 06A906032NA 4983

Record the electronic control module identification number.

End diagnosis and switch the ignition off.

Procedure

Switch the ignition on.

Actuate the touch-wipe function to allow the wipers to move to the end position.

Note. The wiper arms will now move into the line of view on the windshield (service position).

Remove the wiper arms caps.

Loosen the wiper arm nuts -arrows- several turns.

Scheme 76

Loosen the wiper arms from the wiper axle by rocking slightly.

Note. Do not force wiper arms off. If the wiper arms cannot be removed, use a standard puller.

Remove the wiper arms nuts and the wiper arms from the wiper axles.

Remove the rubber seal -1- and the plenum chamber cover -2-.

Scheme 77

Remove the retaining screw -arrow- and the Engine Control Module (ECM) -J623-.

Scheme 78

Disconnect the Engine Control Module (ECM) -J623- electrical harness connector T81 -1-.

Scheme 79

Note. The threads of the shear bolts have been coated with a locking compound and must be heated to be removed. Heat only the shear bolts that are not installed in the Engine Control Module (ECM) -J623-.

Using a Heat gun set at its lowest setting, heat the shear bolts -arrows- for approx. 20 to 25 seconds.

Scheme 80

Remove the shear bolts -arrow- with locking pliers. Discard the used shear bolts.

Scheme 81

Remove the protective housing -1- from the Engine Control Module (ECM) -J623-.

Scheme 82

Disconnect the Engine Control Module (ECM) -J623- electrical harness connector T40 -2- from the Engine Control Module (ECM) -J623-.

Engine Control Module (ECM) -J623- installation

Installation is performed in reverse order of removal. Note the following

The Engine Control Module (ECM) -J623- must be installed with the protective housing.

Use New shear bolts when installing the Engine Control Module (ECM) -J623-.

Engine Control Module (ECM) -J623- reprogramming

The new Engine Control Module (ECM) -J623- and immobilizer must be activated.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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 procedure

MOTORONIC ENGINE CONTROL MODULE POWER SUPPLY RELAY, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SA1- OK.
2. Fuse -SA4- OK.
3. Fuse -SD3- OK.
4. Fuse -SC36- OK.
5. Battery voltage at least 12.5 volts.
6. All electrical consumers such as, lights and rear window defroster, switched off.
7. Vehicles with automatic transmission, selector lever in position "P" or "N".
8. A/C switched off.
9. Ground (GND) connections between engine/transmission/chassis OK.
10. Ignition switched off.

Start diagnosis

Using a Multimeter, check the following wiring connection for voltage.

Specified value: 12.5 V

If the specified value was not obtained

Check the Motronic Engine Control Module (ECM) Power Supply Relay -J271- socket 1/30 to the Generator (GEN) -C- B (+) terminal for an open circuit or short to Ground (GND).

Check the electrical harness connectors for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking voltage

Using a Multimeter --, check the following wiring connection for voltage.

Specified value: 12.5. battery voltage.

If the specified value was not obtained

Check the Motronic Engine Control Module (ECM) Power Supply Relay -J271- socket 3/86 to the Battery -A- (+) terminal for an open circuit or short to Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking Ground (GND)

Using a Multimeter --, check the Motronic Engine Control Module (ECM) Power Supply Relay -J271- socket 4/85 to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminal 23 for resistance.

Specified value: 1.5 ohms.

If the specified value was not obtained

Check the Motronic Engine Control Module (ECM) Power Supply Relay -J271- socket 4/85 to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminal 23 for an open circuit or a short to Battery (+).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK

Replace the Motronic Engine Control Module (ECM) Power Supply Relay -J271-.

Perform a road test to verify repair.

If the fault does not return

Repair complete, Generate readiness code. Refer to READINESS CODE .

End diagnosis.

If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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 diagnosis.

FUEL PUMP 2 RELAY, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SA1- OK.
2. Fuse -SA4- OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, selector lever in position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. Ignition switched off.

Start diagnosis

Using a Multimeter, check the following wiring connection for voltage.

Specified value: 12.5 V

If the specified value was not obtained

Check the Fuel Pump (FP) 2 Relay -J49- socket 1/30 to the Generator (GEN) -C- B (+) terminal for an open circuit or short to Ground (GND).

Check the electrical harness connectors for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking voltage

Switch the ignition on.

Using a Multimeter --, check the following wiring connection for voltage.

Specified value: 12.5. battery voltage.

Switch the ignition off.

If the specified value was not obtained

Check the Fuel Pump (FP) 2 Relay -J49- socket 3/86 to the (+) connection 1 for an open circuit or short to Ground (GND).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking Ground (GND)

Using a Multimeter --, check the Fuel Pump (FP) 2 Relay -J49- socket 4/85 to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminal 65 for resistance.

Specified value: 1.5 ohms.

If the specified value was not obtained

Check the Fuel Pump (FP) 2 Relay -J49- socket 4/85 to the Engine Control Module (ECM) -J623- electrical harness connector T81 terminal 65 for an open circuit or a short to Battery (+).

Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK

Replace Fuel Pump (FP) 2 Relay -J49-.

Perform a road test to verify repair.

If the fault does not return

Repair complete, Generate readiness code. Refer to READINESS CODE .

End diagnosis.

If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

Assembly is performed in the reverse of the removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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 diagnosis.

SPEED SIGNAL, CHECKING

The following procedure requires a test drive. Observe all safety precautions.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Speedometer -G21- OK.
2. The Engine Control Module (ECM) -J623- fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. A/C switched off.
6. Ground (GND) connections between engine/transmission/chassis OK.
7. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS => .

Start diagnosis

Connect the scan tool.

Perform a road test with a vehicle speed greater than 5 Km/h.

Using the scan tool, Check the vehicle speed

Compare the vehicle speed on the scan tool to the Speedometer -G21-.

Specified value: a difference of no greater than 10%.

If the specified value was not obtained or no speed was displayed

Check the wiring from the Engine Control Module (ECM) -J623- to the Instrument Cluster Control Module -J285- for an open circuit, Short to Battery (+), or to Ground (GND).

Check the wiring connection for damage, corrosion, loose or broken terminals.

If necessary, repair the faulty wiring connection.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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.

CAN-BUS TERMINAL RESISTANCE, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirement

1. A CAN-Bus malfunction was recognized.
2. The Engine Control Module (ECM) - J623- fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.
5. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
6. A/C switched off.
7. Ground (GND) connections between engine/transmission/chassis OK.
8. 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-.

Procedure

Disconnect the Data Bus On Board Diagnostic Interface -J533- electrical harness connector.

Note. The Engine Control Module (ECM) -J623- must remain connected for the following step.

Using a Multimeter, check the Data Bus On Board Diagnostic Interface -J533- electrical harness connector terminals 6 to 16 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-. Refer to ENGINE CONTROL MODULE, REPLACING .

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 Engine Control Module .

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 Data Bus On Board Diagnostic Interface -J533- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector T81 for resistance.

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

Replace the Data Bus On Board Diagnostic Interface -J533-.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. 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) .
2. If necessary, erase the 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) .
3. 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.

See also:
• Engine Control Module
• [For transmission(s) 02E] Battery, Disconnecting and Connecting
• GENERAL DIAGNOSIS =>
• REMOVAL AND INSTALLATION
• DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
• DIAGNOSTIC MODE 03 - READ DTC MEMORY
• Fuel Injectors, Checking Injection Quantity, Spray Pattern and for Leaks
• MASS AIR FLOW SENSOR
• THROTTLE VALVE CONTROL MODULE
• Coolant Thermostat Housing Assembly Overview
• Coolant Pump
• Fuel Injectors
• DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS
• ENGINE CONTROL MODULE, REPLACING
• THROTTLE VALVE CONTROL MODULE, CHECKING
• TESTING IF DISPLAY IS APPROX. - 40.0 °C
• TESTING IF DISPLAY APPROX. 140.0° C