AUDI A4 2000 B5 / 1.G Instrument Cluster Location Diagram Through Model Year 2000 Owner's Manual

90-43

- Measure resistance (sensor resistance) between
terminal 8 and 7 using VAG1526 multimeter.
Specified values:

Coolant temperature 90 C: approx. 110 Ohm
Coolant temperature 120 C: approx. 50 Ohm If the specified values are not reached, the wire
connection to Engine Coolant Temperature
(ECT) -G2- must be checked.

- Check wire connection according to wiring
diagram.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations If the wire connection is OK, Engine Coolant
Temperature (ECT) -G2- must be replaced.
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90-44

Consumption signal, checking


Special tools and equipment

VAG1526 multimeter
VAG1598 test box with VAG1598/25 adapter
VAG1594 connector test kit
Test box for the individual Engine Control
Module (ECM)

- Set display indicator of board computer to
current consumption (1/100 km),

- Start engine and perform a road test.

- Observe consumption display in instrument
cluster.
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90-45
What appears in the consumption display?
1. constant 0.0 L/100 km
Possible short circuit to battery Ground (GND)
in the signal wire.
- Switch ignition off.

- Connect corresponding test box to the Engine
Control Module (ECM).

Repair Manual, Fuel Injection & Ignition,
Repair Group 24; additional signals, checking;
consumption signal for board computer, checking

- Remove instrument cluster Page 90
-27
and
disconnect blue 32-pin connector from
instrument cluster.

- Connect VAG1598 tester with VAG1598/25
adapter to the blue 32-pin connector.

- 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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90-46

- Perform a resistance check.
Specification: Display < 2 Ohm

- Connect (+) adapter lead to to the corresponding
test box of the Engine Control Module (ECM)
using VAG1526 multimeter

- Connect (-) adapter lead to battery Ground
(GND).

- Perform a resistance check.
Specification: Display > 9 M Ohm

- If the specified values are reached, the wire
connection is OK.
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90-47
2. constant 51 L/100 km
Possible open circuit in the signal wire.
- Switch ignition off.

- Connect test box to Engine Control Module
(ECM).

Repair Manual, Fuel Injection & Ignition,
Repair Group 24; additional signals, checking;
consumption signal for board computer, checking

- Remove instrument cluster Page 90
-27
and
disconnect blue 32-pin connector from
instrument cluster.

- Connect VAG1598 tester with VAG1598/25
adapter to the blue 32-pin connector.

- Connect (+) adapter lead to VAG1598/25 test
box socket 25 using VAG1526 multimeter.

-
Connect (-) adapter lead to the corresponding
test box of Engine Control Module (ECM) and
the corresponding consumption signal socket of
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the Engine Control Module (ECM).

- Perform a resistance check.
Specification: Display < 2 Ohm
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90-48

- Connect (+) adapter lead to to the corresponding
test box of the Engine Control Module (ECM)
using VAG1526 multimeter

- Connect (-) adapter lead to battery Ground
(GND).

- Perform a resistance check.
Specification: Display > 9 M Ohm

- If the specified values are reached, the wire
connection is OK.
3. The consumption display has no logical or
fluctuating consumption value.
The consumption display deviates from the
actual fuel consumption.
- Perform adaptation of consumption display
Page 01
-140
.
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