Audi Q7: Engine Component Power Supply Relay - J757-, Checking
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 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


Engine Coolant Temperature Sensor - G62-, Checking
General Description
The Engine Coolant Temperature Sensor -G62- sends
information about the current coolant temperature to the Engine
Control Module -J623-. It uses the coolant temperature as a
correction value for calculating the injection quantity.
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

Engine Speed Sensor - G28-, Checking
General Description
The Engine Speed Sensor -G28- detects rpm and reference
marks from a toothed wheel on the crankshaft. Without an engine
speed signal, the engine will not start. If the engine speed
signal fails while the engine is running, the engine will stop
immediately.
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



Engine Temperature Control Sensor - G694-, Checking
General Description
The Engine Temperature Control Sensor -G694- sends
information about the current coolant temperature to the Engine
Control Module -J623-. It uses the coolant temperature as a
correction value for calculating the injection quantity.
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


EVAP Canister Purge Regulator Valve 1 - N80-, Checking
General Description
The EVAP system is designed so the admission of fuel vapors
takes place only at idle and at light part-throttle. The EVAP
Canister Purge Regulator Valve 1 -N80- is map-activated by the
Engine Control Module -J623- to accomplish this task.
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 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
General Description
Air mass and charge pressure are two factors used for engine
load management. For this purpose, there are several sensors
with absolutely identical functions. They measure the in
SEE MORE:
Overview - Underbody Trim Panels
1 - Nut
2.5 Nm
Quantity: 2
2 - Bolt
2.5 Nm
Quantity: 4
3 - Bolt
6 Nm
4 - Front Underbody Panel
There are different versions. Refer to the Parts Catalog.
Removing and Installing. Refer to
→ Chapter "Under
1 - Liner Mat
Insert in the door pocket.
2 - Clip
For door trim panel
Quantity: 8
Insert in the trim panel
3 - Rear Reflector
Vehicles with a Left Rear Door Warning Lamp -W37-
Vehicles with a Right Rear Door Warning Lamp -W38-
Component location overview.