Audi Q7: Knock Sensor 1 - G61-, Checking
General Description
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 determine
the presence of engine knock and to retard spark timing, if
necessary.
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".
Knock Sensor 2 - G66-, Checking
General Description
The Knock Sensor 2 -G66- is a tuned accelerometer on the
engine which converts engine vibration to an electrical signal.
The Engine Control Module -J623- uses this signal to determine
the presence of engine knock and to retard spark timing, if
necessary.
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
Low Fuel Pressure Sensor - G410-, Checking
General Description
The low-side fuel pressure is constantly monitored by the
Low Fuel Pressure Sensor -G410- and sent to the Engine Control
Module -J623-. If this pressure deviates from the desired
pressure, the Engine Control Module -J623- sends a signal to the
Fuel Pump Control Module -J538-. The Fuel Pump Control Module
-J538- then sends a PWM signal to the Transfer Fuel Pump -G6-
until the desired fuel pressure is achieved.
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
Motronic Engine Control Module Power Supply Relay - J271 -, Checking
General Description
The following procedure is used to diagnose the Motronic
Engine Control Module Power Supply Relay -J271- and the Engine
Control Module -J623- power supply voltage that is provided by
the Motronic Engine Control Module Power Supply Relay -J271-.
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
READ NEXT:
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:
Overview - Suspension Strut and Upper Control Arm
1 - Control Arm
2 - Bolt
Replace after removing
3 - Shock Absorber Fork
Removing and installing. Refer to
→ Chapter "Shock Absorber Fork, Removing and Installing".
4 - Bracket
For brake hose
5
Overview - Coolant Pipes
Note
The arrows on the coolant pipes and ends of coolant hoses must
align.
Coolant Pipe on the Engine
1 - Bolt
9 Nm
2 - Left Front Coolant Pipes
Removing and installing. Refer to
→ Chapter "Front Left Coolant Pipes, Removing and Ins