ENGINE MANAGEMENT - SENSORS AND ACTUATORS VW AUDI SEAT SKODA


G6 Transfer Fuel Pump (FP)
G17 Engine Coolant Temperature Sensor
G17 Ambient temperature sensor ( installed in the front end section )
G28 Engine Speed (RPM) Sensor
G31 Charge Air Pressure Sensor
G39 Lambda probe / Heated Oxygen Sensor (HO2S) (bank 1)
G40 Camshaft Position Sensor
G40 Hall sender (bank 2)
G40 Camshaft Position (CMP) Sensor
G42 Intake Air Temperature (IAT) Sensor
G61 Knock sensor  (bank 1)
G62 Engine Coolant Temperature (ECT) Sensor
G65 High-pressure sender
G66 Knock sensor 2 (bank 2)
G69 Throttle Position (TP) Sensor
G70 Mass Air Flow (MAF) Sensor
G71 Intake manifold pressure sender / Manifold Absolute Pressure (MAP) Sensor
G76 Vehicle level sender, rear
G77 Vehicle level sender, rear
G78 Vehicle level sender, front left
G79 Pedal position sender/accelerator pedal module with accelerator pedal position sender
G79 Accelerator pedal position sender
G79 Throttle Position (TP) Sensor
G81 Fuel Temperature Sensor
G83 Engine Coolant Temperature (ECT) Sensor (on Radiator) G83
G85 Steering angle sender
G89 Fresh air intake duct temperature sensor ( located in the intake housing of the air conditioner unit )

G98 Exhaust Gas Recirculation (EGR) Temperature Sensor

G108 Lambda probe II
G128 Seat occupied sensor, front passenger side
G130 Lambda probe after catalytic converter / Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G
G131 Lambda probe II after catalytic converter
G150 Left vent temperature sender
G151 Right vent temperature sender
G163 Hall sender 2  (bank 1)
G179 Side airbag crash sensor on driver side (B-pillar)
G180 Side airbag crash sensor on front passenger side (B-pillar)
G185 Accelerator pedal position sender 2
G186 Throttle valve drive
G187 Throttle valve drive angle sender 1
G188 Throttle valve drive angle sender 2
G191 Centre vent temperature sender
G202 Yaw rate sender
G212 Exhaust gas recirculation potentiometer / EGR Potentiometer
G235 Exhaust gas temperature sender

G247 Fuel pressure sender, high pressure - The fuel pressure sensor is mounted in the fuel rail
and is designed for measuring pressures up to 2900 psi (200 bar).

G256 Rear side airbag crash sensor on driver side (C-pillar)
G257 Rear side airbag crash sensor on passenger side (C-pillar)

G263 Evaporator outflow temperature sender - This is installed in the air duct downstream of the
evaporator and constantly transmits the air temperature downstream of the evaporator to
the Climatronic control unit J255.

G283 Front airbag crash sensor for driver side (front end, left) 
G284 Front airbag crash sensor for front passenger side (front end, right)
G289 Vehicle level sender, front right
G290 Compressor temperature sender
G291 Adaptive suspension pressure sender
G294 Brake servo pressure sensor
G295 NOx sender
G299 Intake air temperature sender 2

G308  Evaporator temperature sensor
G336 Intake manifold flap potentiometer / Intake Manifold Runner Position Sensor
G343 Body acceleration sender,rear
G355 Humidity sender 
G393 Fuel gauge sender 4  (angle sender, 50 - 300 W)
G397 Rain and light sensor
G410 Fuel pressure sender, low pressure

G431 Transmitter unit /  Body acceleration sender, front left
G432 Transmitter unit  /  Body acceleration sender, front right
G433 Transmitter unit  /  Body acceleration sender, rear left 
G434 Transmitter unit  /  Body acceleration sender, rear right

G454 Refrigerant temperature sender (installed in the high-pressure line, near the compressor.Its purpose is to determine the refrigerant temperature and to transmit it to the Climatronic control unit J255. Together with the current refrigerant pressure, ambient temperature and coolant temperature
values, the Climatronic control unit J255 is able to diagnose gradual coolant loss. For this purpose,
further conditions, such as engine idling speed must be available. A REFRIGERANT LOSS fault entered in the fault memory remains static, not sporadic. The fault memory entry is stored until the value detected by the sender G454 returns to within the required range. This can be achieved, for instance, by sealing the refrigerant circuit and refilling the refrigerant. The refrigerant temperature sender G454 connection is not equipped with a valve. The sender must therefore only be removed when the refrigerant circuit is empty.


G448 Exhaust Gas Temperature (EGT) Sensor 2
G450 Exhaust Pressure Sensor 1
G476 Clutch position sender
G495 Exhaust Gas Temperature (EGT) Sensor 3

G581 Charge Pressure Actuator Position Sensor

G620 - G623 Cylinder Pressure Sensors
G648 Exhaust Gas Temperature (EGT) Sensor 4

J49 Fuel pump II relay
J17 Fuel Pump (FP) Relay

J104 ABS Control Module - Supplies the Audi/VW side assist with the yaw rate and the current wheel speeds. These variables are used to calculate the current vehicle speed and the curve radius during cornering, etc.

J136 Seat and steering column adjustment control unit with memory with memory function

J179 Automatic Glow Time Control Module
Glow Plug 1 Q10
Glow Plug 2 Q11
Glow Plug 3 Q12
Glow Plug 4 Q13

J126 Fresh air blower control unit - The fresh air blower control unit J126 controls the blower speed in the deluxe automatic air conditioner and the four-zone deluxe automatic air conditioner. In the manual system, a series resistor is installed in its place. The sender is activated by the Climatronic control
unit J255 via an analogue signal.

J197 Adaptive suspension control unit
J220  Motronic control unit
J217 Transmission Control Module (TCM)
J234 Airbag Control Module
J255 Control unit for Climatronic

J285 Instrument Cluster Control Module - Informs the driver by means of error messages in
the event of faults in the Audi/VW side assist and also outputs an acoustic signal to this effect

J338 Throttle valve module

J345 Trailer detector control unit - Informs the Audi/VW side assist whether a trailer is
attached to the vehicle or not. If a trailer is attached to the vehicle, the function is deactivated because
there is a risk of the scanning range of the sensor being impaired. A corresponding message is
displayed in the dash panel insert.

J364 Auxiliary heater control unit
J386 Driver door control unit
J387 Front passenger door control unit
J388 Rear left door control unit
J389 Rear right door control unit
J391 Rear fresh air blower control unit

J393 Convenience system central control unit

J401 Navigation system control unit
J431 Control unit for headlight range

J446 Parking aid control unit : Fitting location Audi Q7: The parking aid control unit J446 is fitted at the rear right, underneath the load floor.The purpose of the parking aid control unit is to:
● Provide the supply voltage for the parking aid sensors
● Evaluate and process the signals from the parking aid sensors
● Activate the two parking aid warning buzzers H15 and H22
● Transmit the information required for displaying the OPS image on the MMI screen to the front 
information display and operating unit control unit J523
● Store the settings with respect to the remote control key when locking the vehicle (rear/front 
volume, rear/front frequency)
● Diagnose the system; manage the fault memory
● Read in the parking aid button E266
● Control the LED in the parking aid button E266
● Communicate with other control units for transmitting and receiving messages

Schematic circuit diagram of the parking aid control unit J446

J489 Radio controlled clock receiver

J502 Tyre pressure monitor control unit
J508 Brake light suppression relay
J518 Entry and start authorisation control unit
J519 Onboard supply control unit
J519 Vehicle Electrical System Control Module
J521 Seat adjustment control unit with memory, front passenger
J527 Steering Column Electronic Systems Control Module
J492 Adaptive cruise control unit

J518 Entry and start authorisation control unit -Tasks of the entry and start authorisation control unit J518 :

● Represents the system bus connection externally. Is a convenience CAN bus user
● Communicates with the other components of the entry and start authorisation system via a local
single-wire bus
● Reads the position of the ignition key in the entry and start authorisation switch E415 via 2 discrete
lines and the single-wire bus
● Reads the position of the entry and start authorisation button E408 (is only installed in combination with Advanced Key)
● Activates the terminal relay for terminal 15 and for terminal 75x
● Requests the engine control unit to start the engine
● Activates the steering column locking and unlocking motor
● Queries the automatic gearbox control unit J217 to determine whether the selector lever is currently engaged in the P or N position.
● Enables "vehicle opening"
● Is the diagnostic interface for all components of the entry and start authorisation system
● Acts as the master for the immobiliser IV vehicle function


J519 Onboard power supply control unit - Installation location - unit J519 is installed in the cockpit at the front left on the control unit holder adjacent the steering column.

J520 Onboard supply control unit 2
J521 Front passenger seat adjustment with memory control unit

J523 Front information display and operating unit control unit - The customer is able to use this to set the desired brightness for the warning lamps. The value is stored in the side assist control unit J769 together with the corresponding key.

J520 Onboard power supply control unit 2 - Functions:
● Reading in the glove box button E316
● Activation of the glove box release motor V327
● Activation of the servotronic solenoid valve N119
● Provides the information on road speed signal, convenience opening and convenience locking to 
the sliding sunroof via one discrete line
● Transfers the measured values from the tilt-angle sensor integrated in the control unit to the CAN bus

There are two variants of the onboard power supply control unit 2 J520.The basis variant has the functions of the glove box release and activates the servotronic solenoid valve. The Highline variant additionally has the functions of the sliding sunroof and a tilt sensor in the control unit. The measured values of the tilt sensor are required for the anti-theft alarm system.
Installation location (Audi Q7) : Onboard power supply control unit 2 is, as shown in the illustration, located below the right-hand front seat.


J525 Control unit for digital sound package
J530 Garage door operation control unit

J533 Data Bus On Board Diagnostic Interface - Installation location Audi Q7 - The data bus diagnostic interface J533 is located on the left behind the dash panel insert and is attached to a mounting bracket.

J538 Fuel pump control unit
J583 NOx sensor control unit
J587 Selector lever sensors control unit

J605 Rear lid control unit - The tailgate control unit J605 communicates with tailgate control unit 2 J756 via a single-wire bus manufactured by systems supplier Valeo. The tailgate control unit J605 is a convenience CAN bus user and can be addressed under the address word 6D with the diagnostic tester. The tailgate control unit 2 J756 cannot be addressed separately with the diagnostic tester; it transmits its diagnostic information to the tailgate control unit J605.The tailgate drives and the tailgate control unit form a unit. They have a single part number. The tailgate control unit J605 is always installed on the left-hand side and is the master control unit, while tailgate control
unit 2 J756 is located on the right-hand side and acts as the slave control unit.

J623 Engine Control Module (ECM)

J644 Energy management control unit - When the vehicle battery is replaced, the energy management control unit J644 must be encoded. This is necessary to adapt the new battery (size, manufacturer, new condition) to the energy management system. Only then will the energy management system function with maximum efficiency and precision. The energy management control unit J644 may only be encoded after a battery is replaced. Otherwise, faults will be produced in the vehicle due to incorrect assessment of the battery state and loss of important history data, which is required, among other things for testing the battery with the VAS tester.

J723 Aerial reader unit for keyless entry system
J756 Rear lid control unit 2

J772 Reversing camera system control unit - The reversing camera system control unit J772 is connected to the convenience CAN. The purpose of the reversing camera system control unit is to:
● Supply the reversing camera with voltage
● Remove distortion from the camera’s wide-angle image
● Superimpose static and dynamic reference lines onto the camera image
● Provide a video input for the camera signal
● Provide a video input for the TV tuner
● Switch to the desired video signal using an integrated video switch
● Supply a video output for the incoming video signal
● Perform a self-diagnosis of the control unit
● Diagnose the incoming camera signals

J773 Convenience system central control unit
J769 Side assist control unit  
J770 Side assist control unit 2 - 
J832 Auxiliary Fuel Pump Relay
J883 Exhaust Flap Control Module With Position Sensor

F47 Cruise control system brake pedal switch

N18 EGR Vacuum Regulator Solenoid Valve
N30 Cylinder 1 Fuel Injector
N31 Cylinder 2 Fuel Injector
N32 Cylinder 3 Fuel Injector
N33 Cylinder 4 Fuel Injector

N70 Ignition coil 1 with output stage
N75 Wastegate Bypass Regulator Valve (uses variable turbine geometry)
N80 Activated charcoal filter system solenoid valve
N95 Driver side airbag igniter
N110 Selector lever lock solenoid

N127 Ignition coil 2 with output stage
N131 Front passenger side airbag igniter 1
N132 Front passenger side airbag igniter 2
N153 Driver seat belt tensioner igniter 1 
N154 Front passenger seat belt tensioner igniter 1
N199 Side airbag igniter on driver side 
N200 Side airbag igniter on front passenger side
N205 Inlet camshaft timing adjustment valve
N213 EGR Valve 2
N250 Driver side airbag igniter 2
N251 Driver side curtain airbag igniter
N252 Front passenger side curtain airbag igniter
N253 Battery isolation igniter
N290 Fuel Metering Valve
N291 Ignition coil 3 with output stage
N292 Ignition coil 4 with output stage
N276 Fuel pressure regulating valve
N311 Adaptive suspension pressure accumulator valve
N336 Damper adjustment valve, front left
N337 Damper adjustment valve, front right
N338 Damper adjustment valve, rear left
N339 Damper adjustment valve, rear right
N345 Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve

V66 Adaptive suspension compressor motor
V102 Centre vent control motor
V107 Defrost flap
V108 Left footwell flap
V109 Footwell flap, right

V110 Centre vent, left -  - If the left or right centre chest vent is closed manually, the left/right centre vent control motor V110/V111 is closed automatically by the centre left/centre right G347/G348 vent
sensor signal.
V111 Centre vent, right

V113  Recirculated air flap
V158 Temperature flap, left
V157 Intake manifold flap motor
V159 Temperature flap, right
V199 Front right defroster/chest vent shutoff flap control motor
V200 Front left defroster/chest vent shutoff flap control motor
V218 Rear left vent control motor (4-zone system only)
V219 Rear right vent control motor (4-zone system only)
V178 Engine Coolant (EC) Circulation Pump 2
V211 Shutoff flap at B-pillar and footwell right
V212 Shutoff flap at B-pillar and footwellleft
V239 Air flow flap, rear right
V240 Air flow flap, rear right
V299 Side vent, left
V300 Side vent, right
V313 Temperature flap, rear left
V314 Temperature flap, rear right
V315 Directional vent, rear left
V316 Directional vent, rear right
V393 Auxiliary Fuel Pump

Z19 Lambda probe heater
Z28 Lambda probe 2 heater
Z29 Lambda probe 1 heater after catalytic converter
Z30 Lambda probe 2 heater after catalytic converter

Z44 NOx sender heater

K19 Seat belt warning system warning lamp
K29 Glow Plug Indicator Lamp
K75 Airbag warning lamp
K145 Front passenger side airbag deactivated warning lamp (PASSENGER AIRBAG OFF)


R14 Rear left treble loudspeaker
R16 Rear right treble loudspeaker
R20 Front left treble loudspeaker
R21 Front left treble loudspeaker
R22 Front right treble loudspeaker

R24 Aerial amplifier - Function: Aerial amplifier for analogue radio (FM, MW, LW) ;Aerial amplifier for auxiliary heater ; Aerial amplifier for TV aerial 4 .
The amplifier for analogue radio is installed in the right C-pillar.The other aerial amplifiers for FM/AM are all connected to this amplifier via coaxial cables.The voltage supply of all aerial amplifiers is performed directly at the aerial amplifier R24 via terminals 30 and 31. All the amplifiers are switched on and off by the analogue radio via a switched DC voltage on the HF radio line. The aerials for navigation, telephone and digital satellite radio for North America (SDARS) are
integrated in the roof aerial.


R36 Telephone transmitter and receiver unit

R52 Telephone and navigation system aerial. Function : Telephone aerial ;Aerial for navigation system;
Aerial for digital satellite radio (SDARS, North America only)

R86 Aerial amplifier for mobile telephone
R78 TV tuner
R96 Rear tyre pressure monitor aerial 

R103 Front left mid-range loudspeaker
R104 Front right mid-range loudspeaker
R105 Rear left mid-range loudspeaker
R106 Rear right mid-range loudspeaker

R111 Aerial amplifier 2.  Function: Aerial amplifier for analogue radio (FM 1, MW, LW) . Aerial amplifier for TV aerial 1

R112 Aerial amplifier 3. Function: Aerial amplifier for analogue radio (FM 2),Aerial amplifier for TV aerial 2 

R118 Media player in position 1
R119 Media player in position 2 
R146 Satellite radio/digital radio 
R147 Satellite radio/digital radio 
R148 Middle loudspeaker (subwoofer) 

R158 Centre treble/mid-range loudspeaker
R159 Rear left mid-range and bass loudspeaker
R160 Rear right mid-range and bass loudspeaker
R189 Reversing camera

R1113 Aerial amplifier 4. Function: Aerial amplifier for analogue radio (FM 3),Aerial amplifier for TV aerial 3; Aerial amplifier for digital terrestrial radio (DAB) , Aerial amplifier for central locking system

E24 Driver side belt switch
E25 Front passenger side belt switch
E224 Airbag disabling key switch,front passenger side
E265 Rear Climatronic operating and display unit
E380 Multimedia system operating unit
E388 Adaptive suspension button
E415 Entry and start authorisation switch 

F189 Tiptronic switch
F305 Gear selector position P switch
F189 Tiptronic switch

Y26 Selector lever position indicator unit



Substitute Functions in Case of Sensor/Actuator Failure


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