Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
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Wiring diagram
Checking conditions
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The Engine Control Module must be matched to the Throttle Body Control Module See page 24-134
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Engine Coolant Temperature must be 85 °C minimum = Display group 04, Display zone 3
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Exhaust system between Three Way Catalyst and cylinder head must be leak tight
Functional check
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Connect VAG 1551/1552 Scan Tool, See: Powertrain Management/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, 3 and 2 buttons to select "Display group 32"
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Press Q button to enter it put
Display will appear as shown (1 to 4 = Display zones)
Read measuring value block 32
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1
2
3
4
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Check Oxygen sensor (before Three Way Catalyst) "learned values" See Display zones 1 and 2, on chart.
If specifications are obtained:
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Press 3 button (VAG 1551) or Up arrow button (VAG 1552).
Display will appear as shown (1 to 4 = Display zones)
Read measuring value block 33
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