Checking voltage supply for air mass meter: Audi A3 1.8 (ARX, ARY, AUM, AUQ)

🧭 Before you start

Fits: Audi A3 (8L, 1996–2003)

• Special tools named: V.A.G 1598/31

Don't miss

• Engine control unit earth is applied to contact 3 of the connector.
• The wiring test also includes checking of the signal wire.
• Connect the test box V.A.G 1598/31 to the wiring harness to the engine control unit, but do not connect the actual engine control unit .

🔧 Engine codes this applies to

📋 Procedure

1. Unplug the connector from the air mass meter G70.
2. Connect up the multimeter (voltage measuring range) as follows.
3. Briefly operate the starter (engine may also start).
4. Check for open circuit or short to earth in the wiring from contact 2 of the connector via the fuse to the fuel pump relay:
5. Eliminate open circuit in wiring/short circuit if necessary.

6. Connect the portable multimeter (voltage measuring range) to contacts 2 and 3 of the connector.
7. Briefly operate the starter (engine may also start). [Note: Engine control unit earth is applied to contact 3 of the connector.]
8. Check wiring from air mass meter G70.
9. Connect the portable multimeter (voltage measuring range) to contacts 3 and 4 of the connector.
10. Check wiring from air mass meter G70. [Note: The wiring test also includes checking of the signal wire.]
11. Connect the test box V.A.G 1598/31 to the wiring harness to the engine control unit, but do not connect the actual engine control unit .
12. Check for open circuit and short to earth or positive in the following wiring:
13. Eliminate open circuit in wiring/short circuit if necessary.
14. Also check all wires for mutual short circuit.
15. Renew air mass meter G70.

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