2.5l - Generic Scan Tool - Engine Code(s): Cepb (coupe) Audi TT 8J рестайлинг

GENERAL INFORMATION

Included in the contents of this Generic Scan Tool (GST) manual is a summary table of the vehicle specific OBD II Emission Related DTCs. The DTC table contains DTC Malfunction Criteria, Threshold Values, Secondary Parameters, Enabling Conditions, Monitoring Time Length, Frequency of Checks, and MIL Illumination information which can be used to accurately monitor and diagnose emissions related faults and perform functions required to run Modes 01 through 0A with a hand held scan tool. For a further description of specific monitor information, an OBD strategy document is referenced throughout this information.

This information also contains the step by step procedures to accurately diagnose and repair a component or system once a DTC has been set. References to repair procedures and wiring diagrams can be found within the diagnostic test procedures.

SAFETY PRECAUTIONS

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 of cleanliness

1. Thoroughly clean all connections and the surrounding area before disconnecting.
2. Place removed parts on a clean surface and cover. Use lint-free cloths.
3. Carefully cover over opened components or seal, if repairs are not performed immediately.
4. When the system is open, do not work with compressed air. Do not move vehicle unless absolutely necessary.
5. 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.).
6. Separated electrical connectors: Protect from dirt and moisture. Make sure connections are dry when reconnecting.

ON BOARD DIAGNOSTIC SYSTEMS

California OBD-II applies to all gasoline engine vehicles up to 14, 000 lbs. Gross Vehicle Weight Rating (GVWR) starting in the 1996 MY and all diesel engine vehicles up to 14, 000 lbs. GVWR starting in the 1997 MY.

Several states in the northeastern United States have chosen to adopt the California emission regulations starting in the 1998 MY and are known as "Green States".

Green States receive California-certified vehicles for passenger cars and light trucks up to 6, 000 lbs. GVWR. Starting in the 2004 MY, Federal vehicle over 8, 500 lbs. will start phasing in OBD-II.

Starting in 2004 MY, gasoline-fueled medium duty passenger vehicles are required to have OBD-II. Federal OBD-II applies to all gasoline engine vehicles up to 8, 500 lbs. GVWR starting in the 1996 MY and all diesel engine vehicles up to 8, 500 lbs. GVWR starting in the 1997 MY.

OBD-II system implementation and operation is described in the remainder of this document.

MALFUNCTION INDICATOR LAMP ILLUMINATION

If the engine control module (ECM) recognizes a malfunction that leads to increased emission values, it indicates them by illuminating the malfunction indicator lamp (MIL) which is located in the instrument cluster.

The ECM switches on the MIL after the ignition is switched on. Shortly after the engine is started, the MIL goes out if the ECM does not detect a malfunction that increases the emission values.

If the ECM recognizes a malfunction that leads to increased emissions during the operation of the engine, the ECM switches on the MIL and an entry is stored in the DTC memory of the ECM.

CONTROLLER AREA NETWORK DATA LINK

The engine control module (ECM) communicates with data bus capable control modules via a CAN Data Link.

The data bus capable control modules are connected via data bus wires, which are twisted together (CAN high and CAN low), and exchange information with the ECM. Missing or implausible information on the data bus is recognized and stored as a malfunction based on specific DTC criteria.

The malfunction indicator lamp (MIL) is illuminated as a result of a CAN message sent by the ECM. The MIL can be turned on, turned off, or blink, depending on the message received.

ELECTRONIC POWER CONTROL WARNING LAMP

The engine control module (ECM) monitors electronic power control (EPC) components when the ignition is switched on.

If a malfunction is recognized in the EPC system, the ECM switches on the EPC warning lamp, which is located in the instrument cluster, and an entry is stored in the DTC memory of the ECM.

DESCRIPTION AND OPERATION

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 the manufacturer. 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.

FUEL SUPPLY SYSTEM

For all fuel supply system component locations, removal/installation procedures and torque specifications.

EVAPORATIVE EMISSION SYSTEM

The evaporative emission system has been designed to minimize the release of hydrocarbons from the fuel system into the atmosphere. The evaporative system components all work together with the ECM to prevent fuel vapor from escaping and route it to the intake manifold to be burned during normal combustion.

The leak detection system checks the integrity of the evaporative emission system by pressurizing system.

1. When leak detection is activated, a pump pressurizes the evaporative system.
2. During the leak diagnosis, the system is monitored for a specific time period. If the pressure does not drop a specific amount during the time period, the system is considered to be sealed.
3. If the pressure drops greater than a specified amount during a specific time period, the system is pressurized once more. The engine control module measures the time until the pressure drops again. The control module uses the measured value to determine the size of the leak.

Leak diagnosis is activated automatically shortly following every engine start. If a malfunction is determined, an entry is made to the DTC memory. The Malfunction Indicator Lamp in the instrument cluster is illuminated if the malfunction is recognized for two subsequent starts.

For all evaporative system component locations, hose routing, removal/installation procedures and torque specifications.

ELECTRONIC ENGINE POWER CONTROL

For EPC, the throttle valve is not operated by a cable from the accelerator pedal. There is no mechanical connection between the accelerator pedal and the throttle valve.

The position of the accelerator pedal is communicated to engine control module (ECM) by the throttle position sensor / accelerator pedal position sensor 2 (variable resistances; stored in one housing) that are connected with the accelerator pedal.

The accelerator pedal position (driver's intention) is a main input unit for the ECM.

Operation of the throttle valve occurs via an electric motor, the throttle drive for in the throttle valve control module. This is true across the entire engine speed and engine load spectrum.

The throttle valve is operated by the EPC according to specifications of engine control module (ECM).

With engine off and ignition switched on, the ECM controls the throttle drive according to specifications of throttle position sensor / accelerator pedal position sensor 2. This means, if the accelerator pedal is pressed half way, the throttle drive opens the throttle valve to the same degree; i.e. throttle valve is then opened approximately half way.

With engine running under load, ECM can open or close the throttle valve independently of the throttle position sensor / accelerator pedal position sensor 2.

This means, for example, that the throttle valve could be fully opened even though the accelerator pedal has only been pressed half way. This has the advantage of preventing torque losses at the throttle valve.

In addition, it results in a significant reduction in emissions and fuel consumption under certain load conditions.

It would be incorrect to think that EPC consists of only one or two components. EPC is much more of a system containing all components that contribute to recognizing, controlling and monitoring the position of the throttle valve.

FUEL INJECTION SYSTEM

For all fuel injection system component locations, removal/installation procedures and torque specifications.

ENGINE CONTROL MODULE

The ECM regulates fuel injection, throttle valve control module, oxygen sensor regulation, ignition, knock control, evaporative emission purge valve, engine speed limitation through the fuel injectors or the power supply relay, as well as OBD functions.

EXHAUST SYSTEM COMPONENTS

For all exhaust system, emission control component locations, removal/installation procedures and torque specifications.

SECONDARY AIR INJECTION SYSTEM

The secondary air injection system improves the secondary oxidation within the catalytic converter which are due to the rich mixture during the cold start phase where the exhaust emissions contain an increased level of unburned hydrocarbons, thereby reducing harmful emissions. The heat released by secondary oxidation shortens the startup time of the catalytic converter considerably, as well as significantly improves emissions quality during the cold-running phase.

1. During a cold start, the secondary air injection system injects air behind the exhaust valves. This produces an oxygen rich exhaust gas, causes the after burning and reduces the heating-up phase of the catalytic converter.
2. In addition, the secondary air injection system is switched on (after a delay) during idle after every subsequent engine start (up to a maximum coolant temperature) and is checked through on board diagnostic functions.

For all secondary air injection system component locations, removal/installation procedures and torque specifications.

IGNITION SYSTEM

For all ignition and glow plug system component locations, removal/installation procedures and torque specifications.

AUTOMATIC TRANSMISSION

The transmission control module receives information from transmission related components and uses this information to control shifting and operation of the transmission.

For all automatic transmission component locations, removal/installation procedures and torque specifications.

PRELIMINARY CHECK

Prior to component diagnosis, a preliminary check must be performed.

Connect the scan tool.

Switch the ignition on.

Using the scan tool, check for any stored or related DTCs.

If other DTCs are stored

Repair these DTCs first before performing the following procedure.

If no other DTCs are stored

Using the scan tool, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

Perform a road test to attempt to duplicate the customers complaint.

If the DTC returns

Perform the diagnostic procedure.

If the DTC does not return

The fault is intermittent or a sporadic condition may exist.

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

If necessary, repair the faulty wiring connection.

Perform a road test to verify the repair.

If the DTC returns

Perform the diagnostic procedure.

If the DTC does not return

The fault may have been the result of a loose electrical connection.

Generate readiness code. Refer to READINESS CODE .

READINESS CODE

Readiness code description

Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an emissions related system, a readiness code is generated by road testing the vehicle.

If a malfunction is recognized during the drive cycle, it will be stored in the DTC memory.

The OBD drive cycle operation will be monitored with a hand held diagnostic tool. Consult the manufacturer's instruction information for correct tool operation.

The readiness code is erased every time the DTC memory is erased or any time the battery is disconnected. If the DTC memory has been erased or the battery is disconnected, a new readiness code must be generated.

Only erase the DTC memory if a DTC has been stored.

General recommendations

Most monitors will complete easier and quicker using a "steady-foot" and "smooth" acceleration during the drive cycle operation, cruise, and acceleration modes.

Operating conditions

For the EVAP monitor test, the coolant temperature and the ambient air temperature must be between 10° C and 35° C with a difference between them no greater than 4° C. The ambient air temperature must not change more than 4° C during the drive cycle procedure (e.g. when driving out of a heated workshop in the winter).

Test requirements

1. Erase the DTC memory.
2. Coolant temperature must be between 80° C and 110° C.
3. The intake air temperature must be between 10° C and 35° C.
4. Battery voltage must be a minimum of 12.5 volts.
5. Fuel tank level 1/4 to 3/4 full.

Drive Cycle Procedure

Connect the scan tool.

Switch the ignition on and start the vehicle.

Idle the vehicle for 2-3 minutes. This executes the O2 heater, misfire, secondary air injection, fuel trim, and purge system monitors.

Drive the vehicle at 45-55 mph for a continuous 7 minute period - avoid stopping. This executes the evaporative, O2 sensor, fuel trim, and misfire monitors.

Accelerate the vehicle to an engine speed of 5000 RPM; lift off the throttle until the engine speed is around 1200 RPM. This executes the fuel cut off.

Accelerate the vehicle smoothly to 60-65 mph, cruise constantly for 5 min, this executes the catalyst; O2 sensor, misfire, fuel trim, and purge system monitors.

Decelerate and idle the vehicle again for 3 minutes. This executes the misfire, secondary sir injection, fuel trim, and purge system monitors.

Check the status of the readiness code.

Note. Depending on the scan tool used. The readiness code status may be displayed as complete, passed or OK.

If any engine monitor fails the drive cycle test. Repeat the drive cycle test until all engine monitors have successfully run through and passed.

Note. When repeating the drive cycle operation for a failed evaporative or thermostat monitor, allow the engine to cool until the coolant temperature and the ambient air temperature are be between 10° C and 35° C with a difference no greater than 4° C and repeat the drive cycle operation.

If the drive cycle operation fails again.

Check the DTC memory for stored DTCs.

Repair the vehicle if necessary.

Repeat the drive cycle operation until all engine monitors have successfully run through and passed.

Remove the scan tool and switch the ignition off.

DIAGNOSTIC MODES 01 - 0A

The information provided in Modes 01 through 0A displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes, erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and Test-IDs used within the modes to monitor the engine, and emission related component parameters.

Note. Depending on scan tool and protocol used, the information in diagnostic mode 01 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), or On-Board Diagnostic Monitor Identifier (OBDMID).

DIAGNOSTIC MODE 01 - READ CURRENT SYSTEM DATA

Diagnostic Mode 01 makes it possible to access current emissions-related measured values and diagnostic data. The original measured values (no replacement values), input and output data and system status information are displayed using Diagnostic Mode 1.

Test requirement

1. Coolant temperature at least 80 °C.

Procedure

Connect the scan tool.

Start the engine and run at idle.

Select "Diagnostic Mode 1: Obtain data.".

From the following table, select the desired the "PID" that is to be monitored, e.g. "PID 05 Coolant temperature".

The current values of the component or system that is being monitored will be displayed on the scan tool screen.

Switch the ignition OFF.

DIAGNOSTIC MODE 02 - READ OPERATING CONDITIONS

When an emissions-related fault (pending DTC, visible in mode 07) is first detected, operating conditions are stored. Mode 02 makes it possible to access this freeze frame data as soon as this fault is shown in mode 03. Each control module only shows freeze frame data for one fault via mode 02. Therefore, there are two priority levels. If there is a malfunction with higher priority, the freeze frame data is overwritten.

Fault with higher priority: Misfire malfunction or fuel trim malfunction.

Fault with normal priority: All other emissions-related faults.

Note. Depending on scan tool and protocol used, the information in diagnostic mode 02 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), or On-Board Diagnostic Monitor Identifier (OBDMID).

Procedure

Connect the scan tool.

Start the engine and run at idle.

Note. If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward.

Select "Diagnostic Mode 2: Obtain operating conditions.".

From the following table, select the desired the "PID", e.g. "PID 05 Coolant temperature" that is to be monitored.

The current values of the component or system that is being monitored will be displayed on the scan tool screen.

Switch the ignition OFF.

DIAGNOSTIC MODE 03 - READ DTC MEMORY

Diagnostic Mode 03 makes it possible to read emissions-related faults (confirmed DTCs: faults which have activated the MIL) in the ECM and in the TCM.

When the ECM recognizes an emission related fault it turns on the malfunction indicator lamp. If an electronic throttle malfunction is recognized, the ECM turns on the electronic power control warning lamp. Both are located in the instrument cluster.

The DTCs are sorted by SAE code with the DTC tables consisting of a 5 digit alpha numeric value.

Note. Depending on scan tool and protocol used, diagnostic mode 03 and the information provided may be referred to by a different name.

The following tables provide a breakdown and explanation of the DTC code.

P-Codes

U-Codes

Procedure

Connect the scan tool.

Switch the ignition to the ON position.

Select Diagnostic Mode 03: Interrogating fault memory.

The stored DTC or DTCs will be displayed on the scan tool screen.

The following table is an example of the DTC information that may be displayed on the scan tool screen

Refer to the DTC tables for the diagnostic repair procedures.

Switch the ignition OFF.

DIAGNOSTIC MODE 04 - ERASE DTC MEMORY

Diagnostic Mode 04 makes it possible to erase the DTC memory and to reset all emissions-related diagnostic data. In that way, all faults in the DTC memory in the ECM and TCM are erased. The adaptation values may also be reset.

Emissions-related diagnostic data includes (as applicable)

1. MIL Status
2. Number of DTCs
3. Readiness bits
4. Confirmed DTCs
5. Pending DTCs
6. DTC that belongs to freeze frame
7. Freeze frame data
8. Test results of specific diagnostic functions
9. Distance driven with "MIL ON"
10. Number of warm-up cycles after erasing the DTC memory
11. Distance driven after erasing the DTC memory
12. Misfire counter

Note. Depending on scan tool and protocol used, diagnostic mode 04 and the information provided may be referred to by a different name.

Procedure

Connect the scan tool.

Switch the ignition on.

Select Diagnostic Mode 03: Interrogating fault memory.

Then select Mode 4: Reset/delete diagnostic data.

The scan tool will display: Diagnostic data are being erased.

Switch the ignition OFF.

DIAGNOSTIC MODE 05 - READ OXYGEN SENSOR MONITORING TEST RESULTS

Note. Mode 05 may not be supported on all systems. On systems where Diagnostic Mode 05 is not supported, refer to Diagnostic Mode 6 for oxygen sensor Monitoring Test Results.

Test requirement

Procedure

DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS

Diagnostic Mode 06 makes it possible to retrieve test results for special components and systems which are continuously or not continuously monitored. If the diagnosis of a system is complete, the diagnostic result and the corresponding thresholds are saved and displayed in mode 06. This data remains saved (even with the ignition off) until either new diagnostic results become available or the DTC memory is erased.

The min & max values for each individual test in Mode 06 represent the min & max operating values for a properly operating system. This data is provided to the individual aftermarket scan tool companies for development of their scan tool. Depending on the scan tool being used, the min & max values shown may vary, or be rounded up or down to the nearest decimal point depending on the aftermarket scan tool company's development process. e.g.

Note. Depending on the scan tool and protocol used, the information displayed in diagnostic mode 06 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), or On-Board Diagnostic Monitor Identifier (OBDMID).

Test requirements

1. Exhaust system must be properly sealed between the catalytic converter and the cylinder heads.
2. No DTCs stored in the DTC memory.
3. Coolant temperature at least 80° C.

Work procedure

Connect the scan tool.

Start the engine and run at idle.

Note. If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select the desired "Monitor-ID" of the component or system that is to be monitored, e.g. "Monitor-ID 01: Oxygen Sensor Monitor Bank 1 - Sensor 1".

Select the desired "Test-ID".

The current minimum and maximum values will be displayed on the scan tool screen.

The following table is a numerical list of all "Monitor ID's" or "Hex ID's" that may be selected.

MONITOR-ID $01 (01): OXYGEN SENSOR MONITOR BANK 1 - SENSOR 1

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $01 (01)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $02 (02): OXYGEN SENSOR MONITOR BANK 1- SENSOR 2

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $02 (02)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $21 (33): OXYGEN STORAGE CONTENT OF CATALYST

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $21 (33)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $35 (53): VARIABLE VALVE TIMING MONITOR

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $35 (53)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

Monitor-ID $3A (58): Fuel Tank EVAP System Integrity/Leak Test (0.90)

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $3A (58)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $3B (59): FUEL TANK EVAP SYSTEM INTEGRITY/LEAK TEST (0.40)

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $3B (59)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $3C (60): FUEL TANK EVAP SYSTEM INTEGRITY/SMALL LEAK TEST (0.20)

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $3C (60)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $3D (61): EVAP PURGE FLOW MONITOR

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $3D (61)".

Select the desired "Test-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $41 (65): OXYGEN SENSOR HEATER MONITOR BANK 1 - SENSOR 1

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $41 (65)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $42 (46): OXYGEN SENSOR HEATER MONITOR BANK 1 - SENSOR 2

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $42 (46)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $A2 (162): MIS-FIRE CYLINDER 1 DATA

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $A2 (162)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $A3 (163): MIS-FIRE CYLINDER 2 DATA

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6 Check test the results of components that are not continuously monitored".

Select "Monitor-ID $A3 (163):".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $A4 (164): MIS-FIRE CYLINDER 3 DATA

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $A4 (164)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $A5 (165): MIS-FIRE CYLINDER 4 DATA

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $A5 (165)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

MONITOR-ID $A6 (166): MIS-FIRE CYLINDER 5 DATA

Connect the scan tool.

Start the engine and run at idle.

Select "Mode 6: Check test the results of components that are not continuously monitored".

Select "Monitor-ID $A6 (166)".

Select the desired "Test-ID" or "Hex-ID".

Check specified values at idle.

If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTC's or the corresponding diagnostic repair procedure DIAGNOSTIC MODE 03 - READ DTC MEMORY .

Switch the ignition OFF.

DIAGNOSTIC MODE 07 - READ FAULTS DETECTED DURING THE CURRENT OR LAST DRIVING CYCLE

Mode 07 makes it possible to check emissions-related faults which appeared during the current or last driving cycle (pending DTCs).

A pending DTC is saved the first time a fault is detected (output via Mode 07).

If the fault is detected again by the end of the following driving cycle, a confirmed DTC is entered (output via Mode 03) and the MIL is activated.

If this malfunction is not detected again by the end of the following driving cycle, the corresponding pending code will be deleted at the end of the driving cycle.

Note. Depending on scan tool and protocol used, some of the information provided may be referred to by a different name.

Procedure

Connect the scan tool.

Start the engine and run at idle.

Note. If the engine does not start, crank the engine using starter for at least 5 seconds. Do not switch the ignition off afterward.

Select Mode 7: Check test results of components that are continuously monitored.

The number of pending DTCs or 0 malfunctions detected will be displayed on the scan tool screen.

Refer to the DTC tables for the diagnostic repair procedures.

Switch the ignition OFF.

DIAGNOSTIC MODE 08 - REQUEST CONTROL OF ON-BOARD SYSTEM, TEST OR COMPONENT

Not supported on this vehicle

DIAGNOSTIC MODE 09 - READ VEHICLE INFORMATION

Diagnostic Mode 09 makes it possible to access vehicle-specific information from the ECM and the TCM (where applicable).

Note. Depending on scan tool and protocol used, Diagnostic Mode 09 and the information provided may be referred to by a different name.

Test requirement

1. No internal ECM related DTC's stored in memory.

Procedure

Connect the scan tool.

Switch the ignition on.

Select "Mode 09: Vehicle information".

Select the desired "Test-ID".

The information requested will be displayed on the scan tool screen.

The following table is a numerical list of all "Test-IDs" that may be selected.

Switch the ignition OFF.

DIAGNOSTIC MODE 0A - CHECK PERMANENT DTC MEMORY

Mode 0A - Check Permanent DTC Memory (Request emissions-related diagnostic trouble codes with permanent status after code clear)

Permanent Fault Codes From MY 2010 with Phase-In conforming to CCR 1968.2 (d) (2.2.5): 50% from MY 2010 / 75% from MY 2011 / 100% from MY 2012 The vehicle only participates in Phase-In if all of the OBD-relevant control modules in the vehicle meet these requirements.

Mode 0A may only be supported exclusively by OBD control modules in US vehicles. Mode 0A may not be supported in EOBD vehicles, meaning the control module may not send a response here.

Mode 0A enables the request of all OBD-relevant faults with the status "Permanent Fault Code": -Permanent Fault Codes are Confirmed Fault Codes that are currently activating the MIL. That means faults that are still displayed in Mode 03 but no longer activate the MIL (History Fault Codes) are not Permanent Fault Codes. -Permanent Fault Codes are updated in Mode 0A at the same time as NVRAM storage immediately after switching the ignition off. A newly detected Permanent Fault Code is only visible after switching the ignition off/on in Mode 0A. -Permanent Fault Codes may only be erased in the control module after they are corrected as long as the last diagnostic result was a PASS and the MIL is no longer activated by this fault. The Permanent Fault Codes should be erased from Mode 0A at the same time the MIL switches off when the ignition is switched off/on. -Permanent Fault Codes may not be erased by clearing the DTC memory or disconnecting the power supply. Storage in NVRAM is required. -Permanent Fault Codes may only be erased after clearing the DTC memory under the following conditions: -As long as no FAIL diagnostic result was detected for a Permanent Fault Code -and at least one PASS diagnostic result was detected -and the Minimum Trip Conditions for a General Denominator (without considering high/ambient temperature) were met in this phase in any DCY after erasing the DTC memory. -The engine control module relays the message "Minimum Trip conditions met" to all other OBD control modules via CAN: CAN message OBD_01, Byte 8, Bit 4: OBD_Minimum_Trip -Permanent Fault Codes may NOT be erased if the diagnostic result is FAIL after clearing the DTC memory. A Pending Fault Code should be stored and the DTC memory line should be overwritten with new Freeze Frame data. (Exception: If the Pending Fault Code is corrected without a Confirmed Fault Code being detected, the Permanent Fault Code may also be erased under the conditions described below.) -Permanent Fault Codes should be erased in engine control modules after Update Programming. At this time, all readiness bits (Mode 01 PID $01) must be reset to "not complete" [ (g) (4.4.6) (D) ]. Permanent Fault Codes should not be erased in OBD control modules with Comprehensive Components (CCM) as a single readiness bit if the identical program/data status is being programmed. If a different program/data status is being programmed, Permanent Fault Codes should be erased after Update Programming. -The procedure in Mode 01 through Mode 09 and in the service tester is NOT affected by implementation of the Permanent Fault Codes.

DTC TABLES

FUEL PUMP VOLTAGE SUPPLY, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Electrical connector test lead set.

Test conditions

1. Battery voltage 12.5 V.
2. Fuse 47 in Fuse Panel C is OK.
3. Fuel filter OK.
4. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove rear seat bench. Refer to the Repair information.

Test procedure for Fuel Delivery Unit

Remove the floor sealing cover to access the Fuel Delivery Unit (fuel pump).

Disconnect the harness connector from the Fuel Delivery Unit.

Connect the multimeter positive lead to terminal 1 of the Fuel Delivery Unit harness connector.

Connect the multimeter ground to the Battery Negative terminal.

Crank the engine and note voltage displayed on multimeter during crank. Voltage should be within 2.5 volts of battery voltage.

Turn the ignition switch OFF.

If voltage is below specification

Check voltage supply from the Fuel Pump relay (J17).

If voltage is within specification

Connect the multimeter ground lead to terminal 5 of the Fuel Delivery Unit harness connector.

Connect the multimeter positive lead to terminal 1

Crank the engine and note voltage displayed on multimeter during crank. Voltage should be within 2.0 volts of battery voltage.

Turn the ignition switch OFF.

If voltage is below specification

Check for open ground circuit or poor ground connection. Repair as necessary. Refer to Wiring Diagrams for pin locations.

If voltage is within specification

Replace the Fuel Delivery Unit (Fuel Pump). Refer to the Repair information

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

FUEL PUMP PRESSURE, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. fuel line adapter set V.A.G. 1318/17A. These tools may be substituted with an equivalent aftermarket tool and are also available for rental or purchase through the local dealer.
3. In line Fuel pressure gauge with shutoff. (high pressure).

Test conditions

1. Battery voltage 12.5 V
2. Function and voltage supply for the Fuel Pump is OK.
3. Fuel tank at least 1 / 4 filled.
4. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Disconnect fuel supply line and catch any fuel coming out with a shop towel. Refer to the Repair information for location.

Note. Pull circlip upward to unlock fuel line

Install a fuel pressure gauge with appropriate adapters.

Open shut off valve on fuel gauge.

Switch ignition on and off repeatedly until fuel pressure stops increasing pressure.

Read fuel pressure on the gauge.

1. Specified value: 3.5 to 4.3 bar
2. Turn the ignition switch OFF.

If specification is exceeded

Check return line between fuel filter and fuel pump for kinks or blockage.

If no malfunction in fuel return line is found

Pressure relief valve in fuel filter is malfunctioning.

Replace the fuel filter. Refer to the Repair information.

If specified value was Not obtained

Check fuel pressure at the fuel filter between fuel pump and fuel filter using appropriate adapters

Open shut off valve on gauge and start the engine. Allow to idle.

Slowly close the pressure gauge shut off and note the fuel pressure.

1. Pressure must increase to 4 bar.

When 4 bar is reached: Open shut off tap immediately!

Turn the ignition switch OFF.

If pressure has increased during test

Fuel pump is OK. Pressure relief valve in fuel filter is malfunctioning.

Replace the fuel filter. Refer to the Repair information.

If pressure did not increase

Fuel pump is faulty

Replace the fuel pump. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

FUEL PUMP DELIVERY RATE, CHECKING

Special tools and workshop equipment required

1. Hand held remote control (jumper).
2. Multimeter.
3. Electrical connector test lead set.
4. Fuel pressure test set.
5. Measuring container, fuel-resistant.

Test conditions

1. Battery voltage 12.5 V
2. Fuel filter OK
3. Fuel tank at least 1 / 4 filled.
4. Fuel pressure regulator OK.
5. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the fuel filler cap from fuel filler tube.

Remove rear seat bench. Refer to the Repair information.

Remove the floor sealing cover.

Disconnect the electrical harness connector from the fuel delivery unit.

Connect a hand held remote control (jumper) to terminal 1 of the fuel delivery unit and to vehicle battery (+).

Connect a jumper wire from terminal 5 of the fuel delivery unit to vehicle Ground.

Disconnect the fuel return line by pressing release buttons.

Connect a fuel line from the fuel pressure test set to the disconnected fuel return line and hold it in the measuring container.

Press the switch on the hand held remote control (jumper) and operate the fuel pump for 15 seconds.

Compare quantity of fuel delivered with minimum delivery rate in the diagram (cm 3 /30s).

Note. Voltage at the fuel pump with engine stopped and fuel pump running is approx. 2 volts less than battery voltage.

If minimum delivery quantity is not obtained, the following malfunctions may be present

If specified value was Not obtained

Check the following components

1. Fuel lines pinched.
2. Fuel filter restriction.
3. Fuel pump faulty.

Repair or replace the above components as necessary.

To replace the fuel filter refer to the Repair information.

To replace the fuel pump refer to the Repair information.

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

Install the rear seat bench. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

FUEL PUMP ELECTRICAL, TESTING

Special tools and workshop equipment required

1. multimeter.
2. Electrical connector test lead set.

Test conditions

Scheme 325

1. Battery voltage 12.5 V.
2. Fuse -27- in Fuse Panel C is OK.
3. Fuel filter OK.
4. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove rear seat bench. Refer to appropriate service information.

Remove the Fuel Pump Control Module from the retaining clips on the floor sealing cover.

Scheme 326

Disconnect the electrical harness connector -arrow- from the Fuel Pump Control Module.

Scheme 327

Connect the multimeter ground lead to terminal -6- of the Fuel Pump Control Module harness connector.

Connect the multimeter positive lead to terminal -1- of the Fuel Pump Control Module harness connector.

Scheme 328

Turn the Ignition key to the ON position.

The meter should read within 1 V of battery voltage.

If voltage is below specification, locate wiring fault in ground or power circuit. Refer to wiring diagram for location.

If voltage is OK, connect multimeter positive lead to terminal -3- of the Fuel Pump Control Module harness connector. The ground lead remains on terminal -6

Crank the engine and note voltage displayed on multimeter during crank. Voltage should be within 2.5 volts of battery voltage.

If voltage is below specification, locate wiring fault in the power circuit. Refer to wiring diagram for location.

If voltage is OK, connect multimeter positive lead to terminal -2- of the Fuel Pump Control Module harness connector. The ground lead remains on terminal -6

Crank the engine and note voltage displayed on multimeter during crank. Voltage should be 3.2 volts (+/-.4)

If voltage is below specification, check circuit from Fuel Pump Control Module to ECM for open, short or high resistance and repair as necessary. If no circuit fault is found, replace ECM.

If voltage is OK, reconnect the wiring harness to the Fuel Pump control Module.

Test procedure for Fuel Pump Control Module

Remove the floor sealing cover to access the Fuel Delivery Unit (fuel pump).

Disconnect the harness connector from the Fuel Delivery Unit.

Connect the multimeter positive lead to terminal -1- of the Fuel Delivery Unit harness connector.

Connect the multimeter ground lead to terminal -5- of the Fuel Delivery Unit harness connector.

Scheme 329

Crank the engine and note voltage displayed on multimeter during crank. Voltage should be within 2.5 volts of battery voltage.

If voltage is below specification, replace the Fuel Pump Control Module (J538).

If voltage is within specification, replace the Fuel Pump (G6). Refer to appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

FUEL PRESSURE SENSOR, CHECKING

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools and workshop equipment required

1. multimeter
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) Control Module -J538- OK.
2. The Engine Control Module (ECM) - J623- fuses OK.
3. The fuel filter OK.
4. The battery voltage at least 12.5 V.
5. All electrical consumers switched off (radiator fan must NOT run during test).
6. A/C switched off.
7. The fuel tank at least 1 / 4 filled.
8. The ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to appropriate service information.

Checking voltage

Disconnect the Fuel Pressure Sensor -G247- electrical harness connector.

Switch the ignition on.

Using a multimeter, check the Fuel Pressure Sensor -G247- electrical harness connector terminals for voltage.

Switch the ignition off.

If the specified value was obtained

Replace the Fuel Pressure Sensor -G247-. Refer to appropriate service information.

If the specified value was not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Using a multimeter, check the Fuel Pressure Sensor -G247- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit according to the wiring diagram.

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

Replace the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Install the engine cover with air filter. Refer to appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

FUEL METERING VALVE, CHECKING

The following procedure is used to diagnose the Fuel Metering Valve -N290- which is controlled by Engine Control Module -J623-.

Special tools and workshop equipment required

1. multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Component Power Supply Relay -J757- OK.
2. The Fuse -SA5- OK.
3. The fuel filter OK.
4. The parking brake engaged.
5. The battery voltage at least 12.5 V.
6. The selector lever of automatic transmission in position "P" or "N".
7. All electrical consumers switched off.
8. A/C switched off.
9. The fuel tank at least 1 / 4 filled.
10. The ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis

Located on the high pressure pump, right side of cylinder head.

Disconnect the Fuel Metering Valve -N290- electrical harness connector -2-.

Scheme 330

Checking internal resistance

Using a multimeter, check the Fuel Metering Valve -N290- terminals 1 to 2 for resistance

Scheme 331

Specified value: 450 to 1000 ohms.

If the specified value was not obtained

Replace the Fuel Metering Valve -N290-. Refer to the appropriate service information

If the specified value was obtained

Checking voltage

Crank the engine.

Using a multimeter, check the Fuel Metering Valve -N290- electrical harness connector terminal 1 to Ground (GND) for voltage.

Scheme 332

Specified value: battery voltage.

Switch the ignition off.

If the specified value was not obtained

Check the wiring from the Fuel Metering Valve -N290- electrical harness connector terminal 1 to the Engine Component Power Supply Relay -J757- socket 8/87 for an open circuit or a short circuit 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 wiring connections

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Using a multimeter, check the Fuel Metering Valve -N290- electrical harness connector terminal 2 to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminal 60 for resistance.

Scheme 333

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

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 .

End diagnosis.

If the DTC returns and no malfunction is found in the wiring and voltage supply was OK

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Assembly is performed in the reverse order of the removal, note the following

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

EVAP SYSTEM, CHECKING FOR LEAKS

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Perform a preliminary check to verify the condition: PRELIMINARY CHECK .

Special tools and workshop equipment required

1. Smoke tester.
2. EVAP and Fuel Supply System Vacuum hose and line routing diagram.

Note. A connection to access the EVAP system can be found in the EVAP hose just below the EVAP purge solenoid. Replace seals and gaskets when performing repair work. Secure all hose connections using hose clamps appropriate for the model type.

Leak checking

Using a Smoke tester, check the Evaporative Emission (EVAP) system for leaks.

Note. Always follow the manufacturers directions for the proper installation and operation of the smoke tester being used.

If a leak is detected

Check the fuel filler cap seal for damage and for proper installation. Replace if necessary.

Check all hose connections of the EVAP system and replace or repair any leaking lines.

Check all hose connections of the Fuel Supply system and replace or repair any leaking lines.

Remove the rear seat bench. Refer to the Repair information.

Remove the floor cover seal.

Inspect the seal under the Fuel Delivery Unit (fuel pump) locking flange for proper sealing. Also check the fuel line connections.

Repair or replace any damaged component.

If no leaks are found in the EVAP or Fuel Supply System

Erase the DTC memory if a code was set. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

Perform a road test to verify repair.

Generate readiness code. Refer to READINESS CODE .

EVAP CANISTER PURGE REGULATOR VALVE 1, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 -N80- fuse OK.
2. The ignition switched OFF.

Note. Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 -N80- is supplied via the Engine Component Power Supply Relay -J757-.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

etc.)

Remove the engine cover with air filter. Refer to the Repair information.

Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 -N80- electrical harness connector.

Checking internal resistance

Using a multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 -N80- terminals 1 and 2 for resistance.

Specified value: 15.0 to 22.0 ohms.

If the specified value was Not obtained

Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 -N80-.

If the specification is obtained

Checking voltage supply

Using a multimeter, check the purge valve electrical harness connector terminal 1 to 2 for voltage.

Turn ignition switch ON.

Specified value: 8.60 volts +/- 2 volts.

Turn the ignition switch OFF.

If the specified value was Not obtained

Leave the multimeter positive lead on terminal 1 and connect the multimeter negative lead to engine ground.

Ignition switch ON.

Specified value: Near battery voltage.

Turn the ignition switch OFF.

If the specified value was Not obtained

Check the circuit from the Fuel Pump relay (J17) to EVAP solenoid terminal 1 for open or high resistance. Refer to Wiring Diagrams for circuit.

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

If necessary, repair the wiring connection.

If the specified value was obtained

Check Ground activation

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 -N80- electrical connector terminal 2 to Engine Control Module (ECM) -J623- electrical connector T94 terminal 9 for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms max.

If the specified value was Not obtained

Check the wiring for a short to voltage, high resistance or an open circuit.

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

If necessary, repair the wiring connection.

If the specified value was obtained

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

EXHAUST FLAP VALVE 1, CHECKING

Special tools and workshop equipment required

1. multimeter.
2. Wiring diagram.

Test requirements

Scheme 334

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. On vehicles with automatic transmission, selector lever in position "P" or "N".
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 PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to the appropriate service information.

Checking internal resistance

Disconnect the Exhaust Flap Valve 1 -N321- electrical harness connector -2-.

Scheme 335

Using a multimeter, check the Exhaust Flap Valve 1 -N321- terminals 1 to 2 for resistance.

Scheme 336

Specified value: 13.6 +/- 5 ohms (at room temp.)

If the specification was not obtained

Replace the Exhaust Flap Valve 1 -N321-. Refer to the appropriate service information.

If the specification was obtained

Checking Voltage supply

Using a multimeter, check the Exhaust Flap Valve 1 -N321- electrical harness connector terminal 1 to Ground (GND).

Operate the engine briefly.

Specified value: battery voltage.

Switch the ignition off.

If the specified value 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 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.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Using a multimeter, check the Exhaust Flap Valve 1 -N321- electrical harness connector terminal 2 to Engine Control Module (ECM) -J623- electrical harness connector T94 terminal 28 for an open circuit.

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 and if the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Install the engine cover with air filter. Refer to the appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

EXHAUST GAS TEMPERATURE SENSOR 1, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Exhaust Gas Temperature (EGT) Sensor 1 -G235-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) - J623- fuses OK.
2. The Fuel Pump (FP) Relay -J17- must be 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.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Checking internal resistance

Disconnect the Exhaust Gas Temperature (EGT) Sensor 1 -G235- electrical harness connector.

Using a multimeter, check the Exhaust Gas Temperature (EGT) Sensor 1 -G235- terminals 1 to 2 for resistance.

Specified value: infinity ohms (INFINITE)

If the specification was not obtained

Replace the Exhaust Gas Temperature (EGT) Sensor 1 -G235-.

If the specification was obtained

Checking Voltage supply

Disconnect the Exhaust Gas Temperature (EGT) Sensor 1 -G235- electrical harness connector -1-.

Scheme 337

Switch the ignition on.

Using a multimeter, check the Exhaust Gas Temperature (EGT) Sensor 1 -G235- electrical harness connector terminals 1 to 2 for voltage.

Scheme 338

Specified value: 0.400 to 0.500 V.

Switch the ignition off.

If any of the specified values was not obtained

Checking wiring

If the manufacturers test box is being used, perform the following step.

Install the Test Box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate Repair information.

Using a multimeter, check the Exhaust Gas Temperature (EGT) Sensor 1 -G235- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

Check the wiring for 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 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 .

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 appropriate Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

INTAKE AIR TEMPERATURE SENSOR AND MANIFOLD ABSOLUTE PRESSURE SENSOR, CHECKING

The following procedure is used to diagnose the Manifold Absolute Pressure (MAP) Sensor -G71- and Intake Air Temperature (IAT) Sensor -G42- which is controlled by Engine Control Module -J623-.

Note. The Intake Air Temperature (IAT) Sensor -G42- is part of the Manifold Absolute Pressure (MAP) Sensor -G71- and cannot be replaced separately Use only gold-plated terminals when servicing terminals in harness connector of Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42-.

Special tools and workshop equipment required

1. multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) -J623- fuse 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. Coolant Temperature at least 80° C.
8. Ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis

Connect the scan tool.

Start engine and let it run at idle.

Using the scan tool, Check the temperature of the Manifold Absolute Pressure (MAP) Sensor -G71- and Intake Air Temperature (IAT) Sensor -G42- at idle

End diagnosis and switch ignition off.

If the specified value was obtained, but the DTC memory has a DTC indicating a Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42- fault

Check the voltage supply of the Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42- CHECKING VOLTAGE SUPPLY .

If specified value was not obtained

Check the wiring of the Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42- INTAKE AIR TEMPERATURE SENSOR AND MANIFOLD ABSOLUTE PRESSURE SENSOR, CHECKING .

CHECKING VOLTAGE SUPPLY

Remove the engine cover. Refer to appropriate service information.

Disconnect the Manifold Absolute Pressure (MAP) Sensor -G71- and Intake Air Temperature (IAT) Sensor -G42- electrical harness connector -1-.

Scheme 339

Crank the engine.

Using a multimeter, check the Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42- electrical harness connector terminal 3 to engine Ground (GND) for voltage.

Scheme 340

Specified value: approx 5 V.

Switch the ignition off.

If specified value was not obtained

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

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

CHECKING ELECTRICAL CIRCUIT

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module -J623-. Refer to appropriate service information.

Using a multimeter, check the Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42- electrical harness connector terminals to the Engine Control Module -J623- electrical harness connector T60 terminals for resistance.

Specified value: 1.5 ohms max.

If any of the specified values were not obtained

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

Replace the Manifold Absolute Pressure (MAP) Sensor -G71- /Intake Air Temperature (IAT) Sensor -G42-.

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 .

End diagnosis.

If the DTC returns and no malfunction is found in the wiring and voltage supply was OK

Replace the Engine Control Module -J623-. Refer to the service information for removal and installation procedures.

Assembly is performed in the reverse order of the removal, note the following

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

INTAKE MANIFOLD RUNNER POSITION SENSOR, CHECKING

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

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.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to appropriate service information.

Disconnect the Intake Manifold Runner Position Sensor -G336- electrical harness connector -arrow-.

Scheme 341

Switch the ignition on.

Using a multimeter, check the Intake Manifold Runner Position Sensor -G336- electrical harness connector terminals 1 to 3 for voltage.

Scheme 342

Specified value: about 5 V

Switch ignition off.

If the specified value was not obtained

Check and/or repair wiring as required.

If the specified value was obtained

Checking internal resistance

Using a multimeter, check the Intake Manifold Runner Position Sensor -G336- electrical terminals 2 to 3 for resistance.

Specified value: 7-25 ohms (at approx. 20° C)

Using a multimeter, check the Intake Manifold Runner Position Sensor -G336- electrical terminals 1 to 3 for resistance.

Specified value: 244 [+/- 40] ohms (at approx. 20° C)

If the specified values were not obtained

Replace the Intake Manifold Runner Position Sensor -G336-. Refer to appropriate service information.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Using a multimeter, check the Intake Manifold Runner Position Sensor -G336- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

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

Replace the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Install the engine cover with air filter. Refer to appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

LEAK DETECTION PUMP, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. EVAP Smoke Machine
3. Wiring diagram.

Test requirements

1. The ignition switched Off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the right rear wheel housing liner. Refer to the Repair information.

Disconnect the Leak Detection Pump (LDP) -V144- electrical harness connector.

Checking internal resistance

Using a multimeter, check the Leak Detection Pump (LDP) -V144- for resistance as follows

If any of the specified values were Not obtained

Replace the Leak Detection Pump (LDP) --V144--. Refer to the Repair information.

If the specified values were obtained

Checking voltage supply

Note. The voltage for the Leak Detection Pump (LDP) --V144-- is supplied via the Fuse SB7.

Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 3 for voltage. Connect the negative lead to engine ground.

Start the engine.

Specified value: Battery voltage.

Switch the ignition Off.

If the specified value was Not obtained

Using a multimeter, check the Leak Detection Pump (LDP) --V144-- wiring from terminal 3 to Fuse SB7. Refer to Wiring Diagrams for pin locations.

Specified value: 1.0 ohms max.

If the specified value was Not obtained

Check the wiring for high resistance, short to ground or an open circuit.

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

If necessary, repair the faulty wiring connection.

If the specified voltage was obtained

Checking wiring

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical connector terminals to Engine Control Module (ECM) -J623- electrical connector terminals for an open circuit or high resistance. Refer to Wiring Diagrams for pin locations.

Specified value: 1.0 ohms max.

If the specified value was Not obtained

Check the wiring for high resistance or an open circuit.

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 wiring and the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Assembly is performed in the reverse order of the removal, note the following

Install the right rear wheel housing liner. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

LOW FUEL PRESSURE SENSOR, CHECKING

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools and workshop equipment required

1. multimeter.
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) Control Module -J538- OK.
2. The Engine Control Module (ECM) - J623- fuses OK.
3. The fuel filter OK.
4. The battery voltage at least 12.5 V.
5. All electrical consumers switched off (radiator fan must NOT run during test).
6. A/C switched off.
7. The fuel tank at least 1 / 4 filled.
8. The ignition switched off.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to appropriate service information.

Checking voltage

Disconnect the Low Fuel Pressure Sensor -G410- electrical harness connector -2-.

Scheme 343

Switch the ignition on.

Using a multimeter, check the Low Fuel Pressure Sensor -G410- electrical harness connector for voltage.

Switch the ignition off.

If the specified value was obtained

Replace the Low Fuel Pressure Sensor -G410-. Refer to appropriate service information.

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.

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

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Using a multimeter, check the Low Fuel Pressure Sensor -G410- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for an open circuit according to the wiring diagram.

Specified value: 1.5 ohms Max.

If the specified value was Not obtained

Check the wiring for an open, high resistance, short to Battery (+) or 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

Replace the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Install the engine cover with air filter. Refer to appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

TURBOCHARGER RECIRCULATING VALVE, CHECKING

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. On vehicles with automatic transmission, selector lever in position "P" or "N".
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 PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to the appropriate service information.

Checking internal resistance

Disconnect the Turbocharger Recirculating Valve -N249- electrical harness connector -2-.

Using a multimeter, check the Turbocharger Recirculating Valve -N249- terminals 1 to 2 for resistance.

Specified value: 13.6 +/- 5 ohms (at room temp.)

If the specification was not obtained

Replace the Turbocharger Recirculating Valve -N249-. Refer to the appropriate service information.

If the specification was obtained

Checking Voltage supply

Using a multimeter, check the Turbocharger Recirculating Valve -N249- electrical harness connector terminal 1 to Ground (GND).

Operate the engine briefly.

Specified value: battery voltage.

Switch the ignition off.

If the specified value 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 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.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Using a multimeter, check the Turbocharger Recirculating Valve -N249- electrical harness connector terminal 2 to Engine Control Module (ECM) -J623- electrical harness connector T60 terminal 31 for an open circuit.

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 and if the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Install the engine cover with air filter. Refer to the appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

CHARGE AIR PRESSURE SENSOR / INTAKE AIR TEMPERATURE SENSOR 2, CHECKING

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

Note. The Charge Air Pressure Sensor -G31- /Intake Air Temperature (IAT) Sensor 2 -G299- shares the same housing. Replacing either component replaces the other at the same time.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

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. On vehicles with automatic transmission, selector lever in position "P" or "N".
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 PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to appropriate service information.

Test sequence

Disconnect the Charge Air Pressure Sensor -G31- /Intake Air Temperature (IAT) Sensor 2 -G299- electrical harness connector -arrow-.

Scheme 344

Start engine and let it run at idle.

Using a multimeter, check the Charge Air Pressure Sensor -G31- /Intake Air Temperature (IAT) Sensor 2 -G299- electrical harness connector terminals 1 to 3 for voltage.

Specified value: min. 4.5 V

Switch the ignition off.

If the specification was obtained

Replace the Charge Air Pressure Sensor -G31- /Intake Air Temperature (IAT) Sensor 2 -G299-.

If the specification was not obtained

Checking wiring

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Using a multimeter, check the Charge Air Pressure Sensor -G31- /Intake Air Temperature (IAT) Sensor 2 -G299- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for an open circuit according to wiring diagram.

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).

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 OK

Replace the Charge Air Pressure Sensor -G31- /Intake Air Temperature (IAT) Sensor 2 -G299-.Refer to appropriate service information.

If no malfunction is detected in the wiring and if the voltage supply was not OK

Replace the Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Install the engine cover with air filter. Refer to appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

WASTEGATE BYPASS REGULATOR VALVE, CHECKING

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. On vehicles with automatic transmission, selector lever in position "P" or "N".
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 PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to the appropriate service information.

Checking internal resistance

Disconnect the Wastegate Bypass Regulator Valve -N75- electrical harness connector -1-.

Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- terminals 1 to 2 for resistance.

Specified value: 20 to 30 ohms (at room temp.)

If the specification was not obtained

Replace the Wastegate Bypass Regulator Valve -N75-. Refer to the appropriate service information.

If the specification is obtained

Checking Voltage supply

Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal 1 to Ground (GND).

Operate the engine briefly.

Specified value: battery voltage.

Switch the ignition off.

If the specification was not obtained

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

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

If necessary, repair the wiring connection.

If no malfunction is found in the wiring

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal 2 to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminal 50 for an open circuit.

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 and if the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Install the engine cover with air filter. Refer to the appropriate service information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

ACCELERATOR PEDAL POSITION SENSOR / ACCELERATOR PEDAL POSITION SENSOR 2, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram

Test requirement

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 connections between engine/transmission/chassis OK.

Note. Use only gold-plated terminals when servicing the electrical harness connector terminals in Accelerator Pedal Position Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185-.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the drivers side storage compartment. Refer to the Repair information

Disconnect the Accelerator Pedal Position Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185- 6 pin electrical harness connector.

Checking voltage supply and wiring

Switch the ignition On.

Using a multimeter, check the following wiring connections for voltage.

Switch the ignition OFF.

If the specified value was Not obtained

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Accelerator Pedal Position Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical connector T94 for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms max.

If the specified value was Not obtained

Check the wiring for high resistance, a short circuit to each other, Battery (+) or Ground.

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

If necessary, repair the faulty wiring connection.

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

Replace the Accelerator Pedal Position Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185-. Refer to the Repair information.

If no fault is detected in the wiring and if the voltage supply was Not OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Install the drivers side storage compartment.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

THROTTLE VALVE CONTROL MODULE, CHECKING

Note. Use only gold-plated terminals when servicing terminals in harness connector of Throttle Valve Control Module -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 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 the Throttle Valve Control Module - J338-. It is operated by the Engine Control Module (ECM) -J623- and the Accelerator Pedal Position Sensor 1 -G79- /Accelerator Pedal Position Sensor 2 -G185-.

The Throttle Valve Control Module -J338- is made up of the following components

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

The Throttle Valve Control Module -J338- cannot be serviced separately and must be serviced as a unit.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

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

Switch ignition OFF.

If the specified values are not obtained

Remove the Throttle Valve Control Module -J338 - far enough so that the electrical connector terminals are reached.

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

Checking 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: 3.0 to 7.0 ohms (at 20° C)

If the specified value was Not obtained

Replace the Throttle Valve Control Module - J338-. Refer to the Repair information.

If the specified value was obtained

Check the voltage supply of the Throttle Valve Control Module -J338- from the Engine Control Module (ECM) -J623- as instructed below.

Checking voltage supply and wiring

Switch the ignition ON.

Using a multimeter, check the Throttle Valve Control Module -J338- electrical harness connector, terminals 2 to 6 for voltage from the ECM.

Specified value: 4.5 to 5.2 V

Switch the ignition OFF.

If the specified value was Not obtained

Checking wiring

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Throttle Valve Control Module -J338- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit according to the wiring diagram. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms max.

If the specified value was Not obtained

Check the wiring for an open, high resistance or short to ground.

If necessary, repair the faulty wiring connection.

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

If no fault is detected in the wiring and the voltage supply was Not OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

HEATED OXYGEN SENSOR, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Heated Oxygen Sensor (HO2S) -G39/Z19-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Heated Oxygen Sensor (HO2S) -G39- fuse OK.
2. The Oxygen Sensor (O2S) Heater -Z19- before catalytic converter OK. (No heater code set).
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 connections between engine/transmission/chassis OK.
7. Exhaust system between catalytic converter and cylinder head properly sealed.
8. Coolant Temperature at least 80° C.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Connect scan tool.

Start the engine and let it run at idle.

Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".

Select "Monitor-ID $01: Oxygen sensor monitoring before catalytic converter".

Select "Test-ID $83: Dynamic test".

Check the specified values at idle.

If the specified value was obtained

Switch the ignition OFF. Generate the readiness code.

If the specified value was Not obtained

Checking primary voltage

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

Using a multimeter, connect the negative lead to engine ground. Check the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector terminals 1, 2, 5, and 6 for voltage.

Specified value: 2.40 V - 3.10 V

Switch the ignition OFF.

If the specified value was obtained

Replace the Heated Oxygen Sensor (HO2S) -G39-.

If the specified value was Not obtained

Checking wiring

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G39- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms Max.

If the specified value was Not obtained

Check the wiring for an open, high resistance, short circuit to each other, Battery (+) or Ground.

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 and the voltage was Not OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

OXYGEN SENSOR HEATER, CHECKING

Note. When servicing terminals in harness connector of Oxygen Sensor (O2S) Heater -Z19-, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Heated Oxygen Sensor (HO2S) -G39- fuse is 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 connections between engine/transmission/chassis OK.
7. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to the Repair information.

Checking internal resistance

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

Using a multimeter, check the Oxygen Sensor (O2S) Heater -Z19- terminals 3 and 4 for correct resistance.

Specified value: 2.5 to 16.0 ohms (at approx. 20° C)

If the specified value was Not obtained

Replace the Heated Oxygen Sensor (HO2S) -G39-.

If the specified value was obtained

Checking voltage supply

Turn the ignition switch ON

Using a multimeter, check the Oxygen Sensor (O2S) Heater -Z19- electrical harness connector terminal 4 to engine ground for voltage.

Specified value: Battery voltage.

Switch the ignition OFF.

If the specified value was Not obtained

Check the wiring for an open, high resistance or short to Ground and replace any open fuse.

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

If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking Ground activation

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Oxygen Sensor (O2S) Heater -Z19- electrical harness connector terminal 3 to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminal 51 for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms max.

If the specified value was Not obtained

Check the wiring for an open, high resistance, short circuit to each other, Battery (+) or 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 and if the voltage supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

OXYGEN SENSOR AFTER CATALYTIC CONVERTER, 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-.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse -SB6- 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 connections between engine/transmission/chassis OK.
8. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis

Perform the function test in Diagnostic Mode 06.

If specified Mode 6 values are obtained

Switch the ignition Off. Generate the readiness code.

If the specified value was Not obtained

Remove the retaining screws and the cover.

Checking primary voltage

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

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-.

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.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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 T94 terminals for resistance. Refer to Wiring Diagrams for pin locations.

2009 - 2010 Models

Specified value: 1.5 ohms Max.

If the specified value was Not obtained

Check the wiring for an open, high resistance, short circuit to each other, Battery (+) or 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 and the voltage supply was Not OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

OXYGEN SENSOR 1 AFTER CATALYTIC CONVERTER HEATER, CHECKING

Note. Vehicle must be raised before electrical harness connector for the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- is accessible. When servicing terminals in harness connector of Oxygen Sensor 02S) 1 (behind Three Way Catalytic Converter (TWC)) Heater -Z29-, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- fuse SB6 in Fuse box B is 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 connections between engine/transmission/chassis OK.
7. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the right vehicle floor cover.

Checking internal resistance

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

Using a multimeter, check the Oxygen Sensor 02S) 1 (behind Three Way Catalytic Converter (TWC)) Heater -Z29- electrical harness connector terminals 1 to 2 for resistance.

Specified value: 2.5 to 14.0 ohms (at approx. 20° C)

If the specified value was Not obtained

Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130

If the specified value was obtained

Checking voltage supply

Turn the ignition switch ON

Using a multimeter, check the Oxygen Sensor 02S) 1 (behind Three Way Catalytic Converter (TWC)) Heater -Z29- electrical harness connector terminal 1 to engine ground.

Specified value: Battery voltage.

Switch the ignition OFF.

If the specified value was Not obtained

Check the wiring for an open, high resistance, short circuit to each other, or Ground.

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

If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking Ground activation

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Oxygen Sensor 02S) 1 (behind Three Way Catalytic Converter (TWC)) Heater -Z29- electrical harness connector terminal 2 to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminal for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms max.

If the specified value was Not obtained

Check the wiring for an open or high resistance.

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 supply was OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Install the right vehicle floor cover.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

ENGINE COOLANT TEMPERATURE SENSOR 1 OR 2, CHECKING

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor -G62 or G83-.

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 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 PRELIMINARY CHECK

Start diagnosis

Connect the scan tool.

Switch the ignition On.

Using the scan tool, check the coolant temperature

Switch the ignition Off.

If the specified value was 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, if the temperature does not climb uniformly or the temperature signal is intermittent.

Switch the ignition OFF.

Replace the Engine Coolant Temperature (ECT) Sensor - G62 or G83-.

Checking internal resistance

Disconnect the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector.

Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor -G62 or G83- terminals 1 to 2 for resistance.

Use the chart below for the specified values

If the specified value was Not obtained

Replace the Engine Coolant Temperature (ECT) Sensor -G62 or G83-.

Testing If Display Is Approx. - 40.0°

Disconnect the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector.

Using a jumper wire, connect the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector terminals 1 to 2.

Check the value indicated on the scan tool display.

If the value jumps to approx. 140.0° C

Switch the ignition OFF.

Replace the Engine Coolant Temperature (ECT) Sensor -G62 or G83-.

If indication remains at approx. -40.0° C

Checking wiring

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector terminal 1 to the Engine Control Module (ECM) -J623- electrical harness connector for an open circuit or a short to voltage, refer to the chart below for the appropriate sensor. Refer to Wiring Diagrams for pin locations.

ECT 1

ECT 2

Specified values: 1.5 ohms Max. and 0 volts disconnected from ECM.

If the specified value was Not obtained

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

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 signal circuit

Using a multimeter, check terminal 2 of the ECT sensor to engine ground.

Specified value: 1.5 ohms Max

If the specified value was Not obtained

Check the wiring for an open circuit or high resistance.

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 ground circuit

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Testing if display approx. 140.0°C

Disconnect the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector.

Turn the ignition switch ON.

If indication jumps to approx. -40.0° C

Switch ignition OFF.

Replace the Engine Coolant Temperature (ECT) Sensor -G62 or G83-.

If indication remains at approx. 140.0° C

Checking wiring

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Disconnect the ECT harness connector at the sensor.

Using a multimeter, check the signal circuit of the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector terminal 1 to engine ground. Refer to Wiring Diagrams for pin locations.

Specified value: OL or no continuity.

If the specified value was Not obtained

Check the wiring for a short circuit to 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

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

AMBIENT AIR TEMPERATURE SENSOR, CHECKING

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Connect the scan tool.

Engine MUST be at room temperature.

Turn the ignition switch On.

Using the scan tool, check the ambient air temperature

Turn the ignition switch OFF.

If the specified value was obtained

Fault may be intermittent. Check for proper connection, damaged wiring or loose terminals.

Note. On some models the display in the cluster will default to 419° F if the circuit is open or shorted to ground. The display on the cluster may show 3 dashes on other models when signal is out of range.

If the specified value was Not obtained

Checking internal resistance

Disconnect the Ambient Air Temperature Sensor -G17- electrical harness connector.

Using a multimeter, check the Ambient Air Temperature Sensor -G17- terminals 1 to 2 for resistance.

Use the chart below for the specified values

Specified values

If the specified value was Not obtained

Replace the Ambient Air Temperature Sensor -G17-. Refer to the Repair information.

If the specified values are obtained, continue the test according to the following table

Checking wiring

Turn the ignition switch ON.

Connect a multimeter to terminals 1 and 2 of the Ambient Air Temperature Sensor -G17- electrical harness connector.

Specified value: near 5.02 V

Turn the ignition switch OFF.

If the specified value was Not obtained

Remove the Instrument Cluster. Refer to the Repair information.

Disconnect the Instrument Cluster harness.

Using a multimeter, check the Ambient Air Temperature Sensor -G17- electrical harness connector terminals 1 and 2 to the Instrument Cluster electrical harness connector for an open circuit or a short, refer to the wiring diagram. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms max.

If the specified value was Not obtained

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

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

If necessary, repair the faulty wiring connection.

If the specified value was obtained

Replace the Instrument Cluster. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

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 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 stall.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Connect the scan tool.

Switch the ignition ON.

Using the scan tool, check the engine speed

Switch ignition OFF.

If the specified value was Not obtained

Checking internal resistance

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

Using a multimeter, connect the RED meter lead to terminal 1 of the Engine Speed (RPM) Sensor -G28- and the BLACK meter lead to terminal 2 for resistance.

Specified value: 11.4 Mohms (+/- 1.4 M)

Multimeter RED lead still connected to terminal 1 of the Engine Speed (RPM) Sensor -G28- and the BLACK meter lead to terminal 3 for resistance.

Specified value: 11.4 Mohms (+/- 1.4 M)

If any of the specified values are not obtained

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

If the specified value was obtained

Checking wiring

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Engine Speed (RPM) Sensor -G28- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms Max.

If the specified value was Not obtained

Check the wiring for an open, high resistance or short to 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 runout Refer to the Repair information.

If the sensor wheel is OK

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

FUEL INJECTORS, CHECKING

The following test procedure is used to diagnose all fuel injectors.

Special tools and workshop equipment required

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

Test requirements

1. The Fuel Pump relay is operational.
2. The Engine Speed (RPM) Sensor -G28- 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 connections between engine/transmission/chassis OK.
8. Ignition switched Off.

Observe safety precautions.

Observe rules for cleanliness.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

Remove the engine cover with air filter. Refer to the Repair information.

Disconnect the Fuel Injector -- electrical harness connectors from Fuel Injectors -N30, N31, N32, N33, N83-.

Checking internal resistance

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

Specified value: 10.0 to 18.5 ohms (at approx. 20° C)

If the specified value was Not obtained

Replace the malfunctioning Fuel Injector -- Refer to the Repair information.

If the specified value was obtained

Checking activation and wiring

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

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

LED should flicker.

Switch the ignition OFF.

If LED does not flicker

Remove the Fuel Pump Relay -J17-.

Connect a jumper between the Fuel pump relay terminals 30 and 87

Turn the ignition switch ON.

Using a test lamp connected to ground, check terminal 1 of the Fuel Injector -- to be tested. The lamp should be ON.

If the test lamp did not turn on, locate the open or high resistance in the voltage supply circuit.

If the voltage supply was OK

If the manufacturers test box is being used, perform the following step.

Install the test box.

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

Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Using a multimeter, check the Fuel Injector -- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohms Max.

If the specified value was Not obtained

Check the wiring for an open, high resistance or short to voltage or ground.

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

If necessary, repair the faulty wiring.

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

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

Install the engine cover with air filter. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .

ECM VOLTAGE SUPPLY, CHECKING

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, selector lever in position "P" or "N".
5. A/C switched off.
6. Ground connections between engine/transmission/chassis OK.
7. Ignition switched OFF.

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

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

Checking voltage

Using a multimeter, check the Engine Control Module (ECM) Power Supply Relay Box socket 8 (relay terminal 87) to Ground.

Specified value: Battery voltage.

If the specified value was Not obtained

Check the wiring connections from the Battery to the Engine Control Module (ECM) Power Supply Relay -J271- socket 8 for an open or a short circuit.

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

If necessary, repair the faulty wiring connection.

If the specified value was obtained

Switch the ignition ON.

Using a multimeter, check the Engine Control Module (ECM) Power Supply Relay Box -- socket 4, (relay terminal 86) to Ground.

Specified value: Battery voltage.

If the specified value was Not obtained

Remove Fuse SD3 (2011 >) in Fuse Panel D and check resistance of circuit between fuse and relay terminal socket 1. Refer to Wiring Diagrams for pin locations.

Specified value: 1.5 ohm or less.

If fuse is blown, locate short to ground in circuit, refer to wiring diagram.

Repair as necessary.

If the specified value was obtained

Checking activation

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

Using a diode test lamp (12 V) connected to Battery + check the Engine Control Module (ECM) Power Supply Relay Box -- socket 6 (relay terminal 85) while cranking the engine.

The test lamp should be ON.

Switch the ignition OFF.

If the test lamp was ON

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

If the test lamp was not ON

Using a multimeter, check the Engine Control Module (ECM) Power Supply Relay -- socket 4 (relay terminal 85), to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminal 69 for resistance.

Specified value: 1.5 ohms Max.

If the specified value was Not obtained

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

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 and ground was not present from the ECM during crank

Replace the Engine Control Module (ECM) -J623-. Refer to the Repair information.

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-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-03-read-dtc) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__diagnostic-mode-04-erase-dtc) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(/audi/tt/8j-2010-2014/remont/cooling-fan/#25l-generic-scan-tool-engine-codes-cepb-coupe__readiness-code) .