Passat Wagon L4-1.9L DSL Turbo (AHU) (1997)
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Specification display zone 4:
Lower range: 2 to 5%.
Upper range: 90 to 95%.
Due to the slow refresh rate of the VAG 1551 Scan Tool, the displayed values can greatly vary. Ensure that the upper and lower range values in
display zones 3 and 4 are obtained. Only regard the minimum or maximum values
If specifications not obtained, check Mass Air Flow sensor and EGR valve voltage supply as follows:
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Press -> button
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Press 0 and 6 buttons to select Function 06 "end data transfer"
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Press Q button to enter input
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Switch OFF ignition
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Disconnect harness connector -1- from Mass Air Flow sensor -2-
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Switch ON ignition
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Select 20 Volt measurement range
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Perform voltage measurement using Fluke 83 multimeter between following connector terminals:
Connector on terminal G70
Specification
3 + Ground
Battery voltage (approx)
3 + 5
Battery voltage (approx)
Connector on terminal G70
Specification
1 + Ground
Approx. 5 Volts
1 + 5
Approx. 5 Volts
If specifications not obtained:
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Switch OFF ignition
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Connect VAG 1598/18 Test Box to ECM harness connector
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Check wiring for open circuit between Test Box sockets and harness terminals using Wiring diagram:
terminal 1 + socket 19
terminal 2 + socket 33