S4 V8-4.2L (BHF) (2004)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow (MAF) Sensor -G70-, Checking
Recommended special tools and equipment
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V.A.G 1526A multimeter
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V.A.G 1594A connector test kit
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V.A.G 1598/31 test box
Test requirements:
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Fuse for Mass Air Flow (MAF) sensor -G70- OK
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Ground (GND) connections at engine and transmission OK
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Fuel Pump (FP) Relay OK; checking. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/Fuel Pump (FP) Relay -J17- and Activation, Checking
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Parking brake engaged.
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Selector lever of automatic transmission 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: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/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 -G70- 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 -G70-.
Checking function
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Connect diagnostic tester. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/Diagnostic Tester, Connecting
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Start engine and let run at idle.
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In diagnostic function "33 - OBD", select "Mode 1: Checking measured values."