A4 Quattro Wagon L4-1.8L Turbo (AWM) (2001)
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Fuel Distance/Mileage Module: Testing and Inspection
Consumption Signal, Checking
Consumption Signal, Checking
Special tools and equipment
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VAG1526 multimeter
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VAG1598 test box with VAG1598/25 adapter
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VAG1594 connector test kit
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Test box for the individual Engine Control Module (ECM)
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Set display indicator of board computer to current consumption (1/100 km).
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Start engine and perform a road test.
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Observe consumption display in instrument cluster.
What appears in the consumption display?
1. constant 0.0 L/100 km
See Possible short circuit to battery Ground (GND) in the signal wire.
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Switch ignition off.
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Connect corresponding test box to the Engine Control Module (ECM).
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Remove instrument cluster and disconnect blue 32-pin connector from instrument cluster.
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Connect VAG1598 tester with VAG1598/25 adapter to the blue 32-pin connector.
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Connect (+) adapter lead to VAG1598/25 test box socket 25 using VAG1526 multimeter
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Connect (-) adapter lead to the corresponding test box of Engine Control Module (ECM) and the corresponding consumption signal socket of
the Engine Control Module (ECM).
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Perform a resistance check.
Specification: Display < 2 Ohms
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Connect (+) adapter lead to to the corresponding test box of the Engine Control Module (ECM) using VAG1526 multimeter
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Connect (-) adapter lead to battery Ground (GND).
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Perform a resistance check.
Specification: Display > 9 M Ohms
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If the specified values are reached, the wire connection is OK.
2. constant 51 L/100 km
See Possible open circuit in the signal wire.
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Switch ignition off.
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Connect test box to Engine Control Module (ECM).
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Remove instrument cluster and disconnect blue 32-pin connector from instrument cluster.
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Connect VAG1598 tester with VAG1598/25 adapter to the blue 32-pin connector.
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Connect (+) adapter lead to VAG1598/25 test box socket 25 using VAG1526 multimeter.
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Connect (-) adapter lead to the corresponding test box of Engine Control Module (ECM) and the corresponding consumption signal socket of
the Engine Control Module (ECM).
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Perform a resistance check.
Specification: Display < 2 Ohms
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Connect (+) adapter lead to to the corresponding test box of the Engine Control Module (ECM) using VAG1526 multimeter
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Connect (-) adapter lead to battery Ground (GND).
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Perform a resistance check.
Specification: Display > 9 M Ohms
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If the specified values are reached, the wire connection is OK.
3. The consumption display has no logical or fluctuating consumption value.
See The consumption display deviates from the actual fuel consumption.
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Perform adaptation of consumption display.
