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Mass Air Flow Sensor, Checking Audi A8 D3 рестайлинг

6.0l 12-cyl. 4v Generic Scan Tool, Engine Code(s): Bsb 2 illustrations ~926 words

Mass Air Flow Sensor, Checking

Note. Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) sensors.

Special tools, testers and auxiliary items required

  1. Hand multimeter V.A.G 1526 or Multimeter V.A.G 1715
  2. Test adapter kit V.A.G 1594
  3. Wiring diagram

Test conditions

  1. Motronic Engine Control Module (ECM) Power Supply Relay J271 -position 4- must be OK, check: --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
  2. Battery voltage (both batteries) must be at least 11.5 Volts.
  3. All electrical consumers such as, lights and rear window defroster must be switched off.
  4. For vehicles with automatic transmission, selector lever must be in "P".
  1. Parking brake must be engaged.
  2. The Ground (GND) connections between engine and body must be OK.
  3. Coolant temperature must be at least 80 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__diagnostic-mode-01-read-current) , Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.
  4. Fuses in right instrument panel fuse holder must be OK: --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

Right instrument panel fuse holder

Function Test

  1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__diagnostic-tester-connecting) .
  2. Start engine and let run at idle.
  3. Under address word 33, select "Diagnostic mode 1: Check measured values".
  4. Select measured value "PID 16: Air flow quantity at mass air flow sensor".
  1. Check specified value of air flow quantity at Mass Air Flow (MAF) Sensor at idle
PIDDiagnostic textSpecification
16Air flow quantity at Mass Air Flow (MAF) sensor
Engine running at idle2.50 to 6.00 g/sec
  1. End diagnosis and switch ignition off.

If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) Sensor G70

  1. Check Mass Air Flow (MAF) Sensor G70 voltage supply.

If specification is not obtained

  1. Check signal and Ground (GND) wires of Mass Air Flow (MAF) Sensor G70.

Voltage Supply of Mass Air Flow Sensors, Checking

  1. Disconnect corresponding 5-pin connector from Mass Air Flow (MAF) Sensor G70 to be tested

Scheme 967

Scheme 967
Scheme 967
  1. 5-pin connector - arrow - from Mass Air Flow (MAF) Sensor G70 with cylinder bank 1 Intake Air Temperature (IAT) Sensor G42.

Note. Cylinder bank 1 with cylinders 1 through 6 is located at right in direction of travel. Mass Air Flow (MAF) sensor G70 with cylinder bank 1 Intake Air Temperature (IAT) Sensor G42 is located left in direction of travel.

Scheme 968

Scheme 968
Scheme 968
  1. 5-pin connector - 1 - from Mass Air Flow (MAF) sensor 2 G246 with cylinder bank 2 Intake Air Temperature (IAT) Sensor 2 G299.

Note. Cylinder bank 2 with cylinders 7 through 12 is located at left in direction of travel. Mass Air Flow (MAF) sensor 2 G246 with cylinder bank 2 Intake Air Temperature (IAT) Sensor 2 G299 is located at right in direction of travel.

  1. Connect multimeter to terminal 2 of 5-pin connector and engine Ground (GND) for voltage measurement.
  2. Start engine and run at idle speed. Specification: at least 11.0 V
  3. Switch ignition off.

If no voltage is present

  1. Check wire between 5-pin connector terminal 2 and Motronic Engine Control Module (ECM) Power Supply Relay J271 for open circuit according to wiring diagram. Wiring resistance: max. 1.5 ohms
  2. Erase DTC memory of Engine Control Module (ECM) --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__diagnostic-mode-04-erase-dtc) , Diagnostic mode 4: Reset/erase diagnostic data.
  3. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__readiness-code-generating) .

If voltage supply and wiring are OK

  1. Connect multimeter to terminal 4 of 5-pin connector and engine Ground (GND) for voltage measurement.
  2. Switch ignition on. Specification: at least 4.5 V
  3. Switch ignition off.

If no voltage is present

  1. Check signal and Ground (GND) wires of Mass Air Flow (MAF) sensor.

Checking Signal and Ground Wires of Mass Air Flow Sensors

  1. Disconnect corresponding 5-pin connector from Mass Air Flow (MAF) sensor G70 to be tested
  1. 5-pin connector - arrow - from Mass Air Flow (MAF) sensor G70 with cylinder bank 1 Intake Air Temperature (IAT) Sensor G42.

Note. Cylinder bank 1 with cylinders 1 through 6 is located at right in direction of travel. Mass Air Flow (MAF) sensor G70 with cylinder bank 1 Intake Air Temperature (IAT) Sensor G42 is located left in direction of travel.

  1. 5-pin connector - 1 - from M ass Air Flow (MAF) sensor 2 G246 with cylinder bank 2 Intake Air Temperature (IAT) Sensor 2 G299.

Note. Cylinder bank 2 with cylinders 7 through 12 is located at left in direction of travel. Mass Air Flow (MAF) sensor 2 G246 with cylinder bank 2 Intake Air Temperature (IAT) Sensor 2 G299 is located at right in direction of travel.

Cylinder bank 1

  1. Connect test box to Engine Control Module (ECM) J623 wiring harness on connecting test box for wiring test.

Cylinder bank 2

  1. Connect test box to Engine Control Module (ECM) 2 J624 wiring harness on connecting test box for wiring test.

Cylinder bank 1 and 2

  1. Check wires between test box and 5-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
  2. Terminal 3 + socket 27
  3. Terminal 4 + socket 53
  4. Terminal 5 + socket 29
  1. Wiring resistance: max. 1.5 ohms
  2. Check wires for short circuit to each other, to vehicle Ground (GND) and to B+. Specification: infinity ohms
  3. Erase DTC memory of Engine Control Module (ECM) --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__diagnostic-mode-04-erase-dtc) , Diagnostic mode 4: Reset/erase diagnostic data.
  4. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__readiness-code-generating) .

If no malfunction is detected in the wiring

  1. Replace corresponding Mass Air Flow (MAF) sensor with Intake Air Temperature (IAT) sensor.
  2. Erase DTC memory of Engine Control Module (ECM) --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__diagnostic-mode-04-erase-dtc) , Diagnostic mode 4: Reset/erase diagnostic data.
  3. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#60l-12-cyl-4v-generic-scan-tool-engine-codes-bsb__readiness-code-generating) .