battery AUDI A3 1999 8L / 1.G ATW Engine Oxygen Sensor Control Workshop Manual
Page 32 of 37
24-102
- Start engine.
Specification: approx. battery voltage,
possibly fluctuating
Note:
At certain operating points, the ECM "pulses"
the Ground (GND) for oxygen sensor heating.
This means that the Ground (GND) is
constantly switched on and off at these points.
It is therefore possible that the voltage
displayed on the tester will fluctuate.
When the ECM switches oxygen sensor heating
on and off can be observed, if necessary, via
the function "read measuring value block"
display group number 041.
If there is no voltage:
- Connect multimeter for voltage measurement as
follows:
Harness connector
Terminal
Measure to
1 (B+) Vehicle Ground (GND)
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Page 33 of 37
- Operate starter briefly.
Specification: approx. battery voltage
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Page 34 of 37
24-103
If there is no voltage again:
- Check wire connection from terminal 1 of
connector to Fuel Pump (FP) relay via fuse for
open circuit:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations If voltage supply is OK:
If there is no voltage: - Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Measure
to
2 (Ground -GND- activation of Engine Control Module -
ECM-) B+
- Start engine.
Specification: approx. battery voltage, possibly fluctuating
- Switch ignition off.
- Connect VAG1598/31 test box at wiring harness to Engine Control
Module (ECM), do not connect ECM Page 24
-19
.
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