audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

With Generic Scan Tool|Page 2855 > < Adapting Kick-Down Function After Replacing Throttle Position Sensor or Engine Control Module|Page 2850
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Air Flow Meter/Sensor: Testing and Inspection
With Generic Scan Tool

Mass Air Flow (MAF) Sensor -G70-, Checking

Recommended special tools and equipment

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V.A.G1526A hand multimeter

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V.A.G1594A connector test kit

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V.A.G1598/31 test box

Test requirements:

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Fuse for Mass Air Flow (MAF) sensor OK

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Ground (GND) connections at engine and transmission OK

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Fuel Pump (FP) Relay OK; checking.  See: Fuel Delivery and Air Induction/Fuel Pump/Fuel Pump Relay/Testing and Inspection/With Generic
Scan Tool

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Parking brake engaged.

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Vehicles with automatic transmission: Selector lever in position "P" or "N".

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Electrical consumers switched off (radiator fan must NOT run during test).

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A/C switched off.

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Coolant temperature at least 80 degrees C see "Mode 1: Check measuring values "; "PID 05: Coolant temperature".  See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Mode 1: Check Measured Values

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Ignition switched off.

NOTE:

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Voltage is supplied to Mass Air Flow (MAF) sensor from Fuel Pump (FP) relay.

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

Checking function

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Connect diagnostic tester.  See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool
Testing/With Generic Scan Tool/Scan Tool Connecting/Connect Diagnostic Tester

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Start engine and let run at idle.

With Generic Scan Tool|Page 2855 > < Adapting Kick-Down Function After Replacing Throttle Position Sensor or Engine Control Module|Page 2850