Audi Q7: Intake Air Temperature Sensor - G42- / Manifold Absolute Pressure Sensor -
G71-, Checking
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 intake air
temperature and the intake manifold pressure. The Intake Air
Temperature Sensor -G42- / Manifold Absolute Pressure Sensor
-G71- is located upstream of the Throttle Valve Control Module
-J338-. They measure the pressure and temperature of the air in
each individual cylinder bank. The values measured here
correspond to the actual air mass in the cylinder bank(s).
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
Intake Manifold Runner Control Valve - N316-, Checking
General Description
The intake manifold runner valve(s) are mounted on a common
shaft and actuated by a vacuum cell. The partial vacuum required
for actuation is supplied by the Intake Manifold Runner Control
Valve -N316-. The Engine Control Module -J623- activates the
Intake Manifold Runner Control Valve -N316- on the basis of a
characteristic map.
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
Intake Manifold Runner Position Sensor - G336-, Checking
General Description
The Intake Manifold Runner Position Sensor -G336- monitors
the position of the intake manifold runner flaps. These flaps
can be adjusted open or closed to provide longer or shorter
intake runners depending on ambient conditions to increase
engine efficiency.
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
Intake Manifold Runner Position Sensor 2 - G512-, Checking
General Description
The Engine Control Module -J623- uses the Intake Manifold
Runner Position Sensor 2 -G512- signal to calculate a correction
value for the charge air pressure. Evaluation of the signal
gives consideration to the influence of temperature on the
density of the charge air.
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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The Knock Sensor 1 -G61- is a tuned accelerometer on the
engine which converts engine vibration to an electrical signal.
The Engine Control Module -J623- uses this signal to dete
General Description
The Oxygen Sensor 1 After Catalytic Converter -GX7- is
positioned downstream of the primary catalytic converter and it
supplies the Engine Control Module -J623- with a voltage si
General Description
The secondary air injection system sends air into the
exhaust using passages in the cylinder head. This extra air
injection takes place using the Secondary Air Injection Pump
Mo
SEE MORE:
Headlamp Housing, Removing and Installing
Removing
- Turn on the ignition and disconnect the ground cable from
the battery. Refer to
→ Chapter "Battery, Disconnecting and Connecting".
- Remove the front bumper cover. Refer to
→ Body Exterior; Rep. Gr.63; Front Bu
1 - Right Stand Support
2 - Lock Washer
3 - Front Mount
For seat/backrest frame
4 - Locking Mechanism
For seat frame
5 - Spiral Spring
6 - Pins
7 - Lock Washer
8 - Front Mount
For seat frame
9 - Pins