fuel AUDI A4 1998 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual
Page 8 of 46
24-78
Display group 032 Display field: 1 / 2
Possible cause
Corrective action
Oxygen sensor adaptation
values below specified
range
Leak in intake area (pressure side between
turbocharger and intake manifold) - Check intake system for leaks and
repair false air Page 24
-68
Oil thinning- Oil change or perform swift country road
test
High oil consumption
Mass Air Flow (MAF) sensor faulty- Mass Air Flow (MAF) sensor, checking
Page 24
-59
Evaporative Emission (EVAP) canister purge
regulator valve remains stuck in open
position - Check Evaporative Emission (EVAP)
canister purge regulator valve Page
24
-114
Fuel pressure too high- Check fuel pressure regulator Page
24
-32
Fuel injector does not close- Check fuel injectors Page 24
-37
.
Oxygen sensor heating faulty
Oxygen sensor faulty- Check oxygen sensor heating Page
24
-89
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Page 9 of 46
24-79
Display group 032 Display field: 1 / 2
Possible cause
Corrective action
Oxygen sensor adaptation
values via specified range
False air in intake area- Check intake system for leaks and repair
false air Page 24
-68
Fuel pressure too low- Check fuel pressure regulator Page 24
-32
Mass Air Flow (MAF) sensor faulty- Mass Air Flow (MAF) sensor, checking
Page 24
-59
Oxygen sensor heating faultyOxygen sensor faulty- Check oxygen sensor heating Page 24
-89
Fuel injector does not open or opens
only partially - Check fuel injectors Page 24
-37
.
Evaporative Emission (EVAP)
Canister Purge Regulator Valve sticks - Check Evaporative Emission (EVAP)
canister purge regulator valve Page 24
-114
Pa
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11/22/2002 htt
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Page 23 of 46
24-92
- Operate starter briefly.
Specification: approx. battery voltage
If there is no voltage again:
- Check wire connection from terminal 3 of
connector to Fuel Pump (FP) relay via fuse for
open circuit:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
If voltage supply is OK:
Note: - Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Measure
to
4 (Ground -GND- activation of Engine Control Module -
ECM-) B+
- Start engine.
Specification: approx. battery voltage
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p://127.0.0.1:8080/audi/servlet/Dis
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Page 43 of 46
24-110
- Operate starter briefly.
Specification: approx. battery voltage
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:
- 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.
Pa
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU07.24.2