catalytic converter AUDI A8 1998 D2 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A8, Model: AUDI A8 1998 D2 / 1.GPages: 166, PDF Size: 0.91 MB
Page 1 of 166
24-1
Motronic Multiport Fuel
Injection (MFI) and ignition
system Component locations
Data Link Connector (DLC)
Fuel pump relay
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) -G130-, with Oxygen
Sensor (O2S) heater -Z29-
Located under knee bar, left side of steering
wheel
Position 6 on relay panel in driver's side footwell
Bank 1, sensor 2
In exhaust system behind TWC
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Page 2 of 166
24-2
Oxygen Sensor (O2S) 2 behind Three Way
Catalytic Converter (TWC) -G131-, with Oxygen
Sensor (O2S) heater -Z30-
EVAP system Leak Detection Pump (LDP) -
V144-
Bank 2, sensor 2
In exhaust system behind TWC
In left-rear wheelhousing behind splash shield
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Page 28 of 166
24-22
Heated Oxygen Sensor (HO2S) and
Oxygen Sensor (O2S) control before
TWC, checking
Notes:
Connector for Heated Oxygen Sensor (HO2S)
before Three Way Catalytic Converter (TWC) -
G39- (bank 1, sensor 1): 4-pin, black.
Connector for Heated Oxygen Sensor (HO2S) 2
before Three Way Catalytic Converter (TWC) -
G108- (Bank 2, sensor 1): 4-pin, black.
Component location page 24
-1
Required special tools and test equipment
VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable
VAG1598/22 test box
Multimeter US1119 (Fluke 83 or equivalent)
VW1594 connector test kit
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Page 54 of 166
24-42
Oxygen Sensor (O2S) and Oxygen
Sensor (O2S) control behind TWC,
checking
Notes:
Connector for Oxygen Sensor (O2S) behind
Three Way Catalytic Converter (TWC) -G130-
(bank 1, sensor 2): 4-pin, green
Connector for Oxygen Sensor (O2S) 2 behind
Three Way Catalytic Converter (TWC) -G131-
(bank 2, sensor 2): 4-pin, brown
Component locations page 24
-1
Required special tools and test equipment
VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable
VAG1598/22 test box
Multimeter US1119 (Fluke 83 or equivalent)
VW1594 connector test kit
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Page 57 of 166
24-44
- Compare display and specified values (display
fields 1-4):
Display fields
1 2 3 4
Display group 36: Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC), Banks 1, 2
Display x.xxx V Test OFF/Test
ON
B1-S2 ok
B1-S2 n.ok x.xxx V Test OFF/Test
ON
B2-S2 ok
B2-S2 n.ok
Indicates Voltage supply to O2S behind
TWC
(Bank 1, Sensor 2) Diagnostic status
Diagnostic result Voltage supply to O2S 2 behind
TWC
(Bank 2, Sensor 2) Diagnostic status
Diagnostic result
Range 0.000 - 1.000 V --- 0.000 - 1.000 V ---
Specified
value 0.000 - 1.000 V
(can oscillate slightly) B1-S2 OK 0.000 - 1.000 V
(can oscillate slightly) B2-S2 OK
If not as specified page 24
-45
, Continuation
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Page 60 of 166
24-47
Checking O2S reference voltage
- Disconnect 4-pin connector for respective
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC).
If voltage is NOT OK:
If voltage is OK: - Connect multimeter US1119 (Fluke 83 or equivalent) between harness
connector terminals 3 and 4 (to ECM), using adapter cables from
VW1594 connector test kit.
- Start engine and measure voltage.
Specified value: 0.40 to 0.50 volts
- Switch ignition off.
- Check O2S wiring.
Bank 1, sensor 2 page 24
-48
.
Bank 2, sensor 2 page 24
-50
.
- Replace respective O2S behind TWC.
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Page 61 of 166
24-48
Checking O2S wiring, bank 1, sensor 2
- Disconnect 4-pin connector (green) for Oxygen
Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130-.
- Connect VAG1598/22 test box to ECM harness
connector page 01
-67
.
- Check wiring for open circuit between ECM/test box and 4-pin O2S
harness connector (to ECM).
Connector terminal 3 to ECM/test box socket 51
Connector terminal 4 to ECM/test box socket 52
Specified value: max. 1.5
- Check wiring for short circuits between terminals of 4-pin connector.
Connector terminal 4 to ECM/test box socket 51
Specified value:
- Check shielding wire for short circuit to sensor wires.
Connector terminal 4 to ECM/test box socket 14
Connector terminal 3 to ECM/test box socket 14
Specified value:
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Page 63 of 166
24-50
Checking O2S wiring, bank 2, sensor 2
- Disconnect 4-pin connector (brown) for Oxygen
Sensor (O2S) 2 behind Three Way Catalytic
Converter (TWC) -G131-.
- Connect VAG1598/22 test box to ECM harness
connector page 01
-67
.
- Check wiring for open circuit between ECM/test box and 4-pin O2S
harness connector (to ECM).
Connector terminal 3 to ECM/test box socket 38
Connector terminal 4 to ECM/test box socket 50
Specified value: max. 1.5
- Check wiring for short circuits between terminals of 4-pin connector.
Connector terminal 4 to ECM/test box socket 38
Specified value:
- Check shielding wire for short circuit to sensor wires.
Connector terminal 4 to ECM/test box socket 14
Connector terminal 3 to ECM/test box socket 14
Specified value:
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Page 70 of 166
24-55
Continuation
- Disconnect 4-pin connector for respective
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC).
If resistance is NOT OK:
If resistance is OK: - Connect multimeter US1119 (Fluke 83 or equivalent) between HO2S
connector terminals 1 and 2, using VW1594 connector test kit.
- Measure resistance.
Specified value: 0.00-19.9 - Replace respective Oxygen Sensor (O2S) behind TWC.
- Switch multimeter to 20 VDC measuring range.
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11/23/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.24.1