Passat Sedan 4Motion W8-4.0L (BDP) (2002)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow (MAF) sensor, checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) sensor.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements
The respective fuses of Mass Air Flow (MAF) Sensor -G70- must be OK.
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Fuses -1, 2, 3, 4 and 7- in protective housing (plenum chamber, left) must be OK:
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Fuel Pump (FP) Relay -J17- must be OK, check:
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Battery voltage must be at least 11.5 Volts.
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All electrical consumers such as, for example, lights and rear window defroster must be switched off.
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Parking brake must be engaged or else daylight driving lights will be switched on.
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For vehicles with automatic transmission, selector lever must be in position -P-or -N-.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
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Coolant temperature must be at least 80 degrees C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. See: Testing and
Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 1: Check Measuring Values
Function test
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Connect diagnostic tester. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan
Tool/Diagnostic Tester, Connecting
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Start engine and let run at idle.
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Under address word 33, select "Diagnostic mode 1: Check measured values."
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Select the measuring value "PID 16: Air flow quantity at Mass Air Flow (MAF) sensor".
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Check specified value of air flow quantity at Mass Air Flow (MAF) Sensor at idle: