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
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Removing
NOTICE
Risk of damaging the operating cable by deforming
it.
- Never sharply bend or kink the operating cable.
Special tools and workshop equipment
required
Pry Lever -80-200-
Removing
- Move the door window into the "closed" position.
- Remove the door inner cov
Overview - Steering Gear
1 - Steering Gear with Tie Rods
With integrated Power Steering Control Module -J500-
The Power Steering Control Module -J500- cannot be replaced
separately if faulty replace the steering gear.
Removing and installing. Refer to
→ Chapter "Steering Gear