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HOMESERVICE MANUALSAUDI2007A3 BASE, AUTOMATIC DCTREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (3.2L - GENERIC SCAN TOOL - ENGINE CODE(S): BUB)ST GENERIC SCAN TOOLDESCRIPTION AND OPERATIONMOTRONIC FUEL INJECTION SYSTEMMASS AIR FLOW SENSOR, CHECKINGCHECKING ELECTRICAL CIRCUIT
2007 Audi A3 Base, Automatic DCT

Checking electrical circuit

2007 Audi A3 Base, Automatic DCTSECTION Checking electrical circuit
WARNING: This page is about a different variant/trim than selected.

If the manufacturers test box is being used. Perform the following step.

-- Install the test box. Refer to Repair information.

If the manufacturers test box is not being used. Perform the following step.

-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .

-- Using a multimeter, check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector T121 terminals for an open circuit.

Fig 1: Identifying 5-Pin Electrical Harness Connector & Terminals
GWWA23-0058Courtesy of AUDI OF AMERICA, LLC
Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminals Motronic Engine Control Module (ECM) -J220- electrical connector T121 terminals or test box socket
1 26
3 27
4 53
5 29

Specified value: 1.5 Ω max.

If the specification was not obtained:

-- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

-- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:

-- Replace Mass Air Flow (MAF) Sensor -G70-.

Final procedures

After repair work, the following work steps must be performed in the following sequence:

  1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
  2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
  3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .

-- End of diagnosis.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.