Audi Q7: Compressor Magnetic Clutch - N421-, Checking
General Description
The supercharger Compressor Magnetic Clutch -N421- is
controlled by the engine control module (ECM) as required, i.e.
the clutch is only engaged when high engine output is requested.
The Compressor Magnetic Clutch -N421- is engaged and forms a
frictional connection between the belt pulley and the
supercharger's driveshaft, which is located in the hub. The
Compressor Magnetic Clutch -N421- is disengaged and the
supercharger is not driven when the engine output requirement is
low.
Special tools and workshop equipment
required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with automatic transmission, ensure the selector
lever position is in "P".
- Vehicles with manual transmission, ensure the shifter lever
position is in "N" with the parking brake applied.
- Coolant temperature: ≥ 80º C.
- Observe all safety precautions:
→ Chapter "Safety Precautions".
- View clean working conditions:
→ Chapter "Clean Working Conditions".
- For Hybrid vehicles, refer to:
→ Chapter "High Voltage System General Warnings".
Test Procedure
Control Valve Control Unit - J808-, Checking
General Description
The Engine Control Module -J623- computes the nominal charge
pressure from the requested torque. If the actual charge
pressure deviates from the nominal charge pressure, the
wastegate is opened further by the Control Door Adjustment Motor
-V380- (charge pressure decreases) or closed further (charge
pressure increases). The rapid response of the Control Door
Adjustment Motor -V380- ensures that the wastegate opens quickly
in overrun mode, thereby reducing the pumping effort of the
turbocharger. The wastegate is closed in the start position. The
Control Door Adjustment Motor -V380- is activated by the PWM
signal, and the Control Valve Position Sensor -G584- provides
position feedback.
The Control Valve Control Unit -J808- contains the following
components:
- Control Door Adjustment Motor -V380-
- Control Valve Position Sensor -G584-
The Control Valve Control Unit -J808- components cannot be
serviced separately, and they must be serviced as a unit.
Special tools and workshop equipment
required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with automatic transmission, ensure the selector
lever position is in "P".
- Vehicles with manual transmission, ensure the shifter lever
position is in "N" with the parking brake applied.
- Coolant temperature: ≥ 80º C.
- Observe all safety precautions:
→ Chapter "Safety Precautions".
- View clean working conditions:
→ Chapter "Clean Working Conditions".
- For Hybrid vehicles, refer to:
→ Chapter "High Voltage System General Warnings".
Test Procedure
Coolant Recirculation Pump - V50-, Checking
General Description
The Coolant Recirculation Pump -V50- is cycled on and off by
the Engine Control Module -J623-.
Special tools and workshop equipment
required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with automatic transmission, ensure the selector
lever position is in "P".
- Vehicles with manual transmission, ensure the shifter lever
position is in "N" with the parking brake applied.
- Coolant temperature: ≥ 80º C.
- Observe all safety precautions:
→ Chapter "Safety Precautions".
- View clean working conditions:
→ Chapter "Clean Working Conditions".
- For Hybrid vehicles, refer to:
→ Chapter "High Voltage System General Warnings".
Test Procedure
Cylinder Head Coolant Valve - N489-, Checking
General Description
Coolant flow is regulated by means of two mechanically
coupled rotary slide valves. The angular position of the rotary
slide valves is regulated according to various engine maps
stored in the engine control unit. Various switching positions
can be implemented by configuring the rotary slide valves
accordingly. This allows rapid heating of the engine, which, in
turn, results in lower friction and higher fuel economy.
Special tools and workshop equipment
required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with automatic transmission, ensure the selector
lever position is in "P".
- Vehicles with manual transmission, ensure the shifter lever
position is in "N" with the parking brake applied.
- Coolant temperature: ≥ 80º C.
- Observe all safety precautions:
→ Chapter "Safety Precautions".
- View clean working conditions:
→ Chapter "Clean Working Conditions".
- For Hybrid vehicles, refer to:
→ Chapter "High Voltage System General Warnings".
Test Procedure
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General Description
The following procedure is used to diagnose the Engine
Component Power Supply Relay -J757- and the power supply voltage
that is provided to the engine components.
Special tools a
General Description
The camshaft's task is to operate the valves at the right
time and in the right order to control the charge cycle.
Camshaft adjustment using the Exhaust Camshaft Adjustment Valve
General Description
The Engine Control Module -J623- tells the Fuel Pump Control
Module -J538- the demand needed for fuel volume and pressure and
activates the Transfer Fuel Pump -G6-. The Transfer
SEE MORE:
Cover and Cushion, Removing and Installing, Second Row Seat Pan Low
Removing
- Remove the guide for the lower child seat anchor. Refer to
→ Chapter "Lower Child Seat Anchor Guide, Removing and
Installing, Second and Third Row".
- Press each catch on all 3 seat frames in direction o
Fig. 139 Upper display: remote controlled parking - preparing the vehicle
Requirements
The setup has been completed.
You are logged into the vehicle with your myAudi
user.
Bluetooth is switched on in the mobile device
and in the MMI.
A suitable parking space has been found and a