Audi Q7 Owners & Service Manuals

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".

Test Procedure

Test Procedure

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

Test Procedure

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

Test Procedure

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

Test Procedure

Test Procedure

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