Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
Mass Air Flow Sensor: Testing and Inspection
Mass Air Flow sensor, checking
Special tools, testers, measuring instruments and auxiliary items required
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VAG 1551/1552 Scan Tool with VAG 1551/3B adaptor cable
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VAG 1598/22 Test Box
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Fluke 83 Multimeter
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VW 1594 Adaptor kit
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Wiring diagram
Check conditions
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Fuse 29 OK.
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Engine Coolant Temperature must be at least 85 °C, = Display group 04, Display zone 3
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All electrical consumers, e.g. lights and rear window defroster must be switched OFF
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A/C switched OFF (if installed).
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Transmission Range selector lever in "P" or "N" position (automatic transmission only)
Test sequence
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Connect VAG 1551/1552 Scan Tool, See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes/Scan Tool Connecting
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Start engine and let idle
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Press 0 and 1 buttons to select "Address word" 01 "Engine electronics"
Display will appear as shown
Rapid data transfer
HELP
Select function XX
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Press 0 and 8 buttons to select Function 08: "Read measuring value block"
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Press Q button to enter input
Display will appear as shown
Read measuring value block
HELP
Input Display group number XXX
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Press 0, 0 and 2 buttons to select "Display group 2"
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Press Q button to enter input
Display will appear as shown (1 to 4 = Display zones)