Touareg V8-4.2L (BHX) (2004)
‹› Battery voltage must be at least 11.5 volts.
‹› All electrical consumers such as, for example, lights and rear window defroster must be switched off.
‹› Parking brake must be engaged or else daylight driving lights will be switched on.
‹› For vehicles with automatic transmission, selector lever must be in P position.
‹› If vehicle is equipped with an A/C system, it must be switched off.
‹› Ground (GND) connections between engine and chassis must be OK.
‹› Coolant temperature must be at least 80 °C , Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.
Function test
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Connect diagnostic tester.
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Start engine and let run at idle.
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Under address word 33, select "Diagnostic mode 1: Checking 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:
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End diagnosis and switch ignition off.
If specified value is obtained, but a DTC concerning Mass Air Flow (MAF) sensors 1 and 2 is stored in DTC memory:
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Check voltage supply of Mass Air Flow (MAF) sensors.