catalytic converter AUDI A8 1998 D2 / 1.G AEB Engine Motronic MFI And Ignition System
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A8, Model: AUDI A8 1998 D2 / 1.GPages: 135, PDF Size: 0.71 MB
Page 1 of 135
24-1
Motronic Multiport Fuel
Injection (MFI) and ignition
system Component locations, overview
----
Data Link Connector (DLC)
Located under knee bar, left side of
steering wheel
----
Fuel pump relayPosition 6 on relay panel in driver's side
footwell
----
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) -G130- with
Oxygen Sensor (O2S) heater -Z29- In exhaust system behind TWC
----
EVAP system Leak Detection Pump (LDP)
-V144- In left-rear wheelhousing behind splash
shield
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Page 2 of 135
24-2
1 -
Heated Oxygen Sensor (HO2S) -G39- with
Oxygen Sensor (O2S) heater -Z19-
2 -
Engine Coolant Temperature (ECT) sensor
-G62-
4-pin connector
3 -
Harness connector for: Heated Oxygen Sensor (HO2S) -G39- and
Oxygen Sensor (O2S) heater -Z19- (4-pin,
brown) Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) -G130- with
Oxygen Sensor (O2S) heater -Z29- (4-pin,
black) Engine speed (RPM) sensor -G28- (3-pin,
gray) Knock sensor (KS) 1 -G61 (3-pin, green)Knock sensor (KS) 2 -G66- (3-pin, blue)
4 -
Electronics box (E-box) with: Motronic Engine Control Module (ECM) -
J220- Barometric Pressure (BARO) sensor -F96-
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Page 25 of 135
24-17
Heated Oxygen Sensor (HO2S) and
oxygen sensor control (before TWC),
checking
Notes:
Connector for Heated Oxygen Sensor (HO2S)
before Three Way Catalytic Converter (TWC):
4-pin, brown
Component location Page 24
-1
Required special tools and test equipment
VAG 1551 or VAG 1552 Scan Tool (ST) with
VAG 1551/3 adapter cable
VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VW 1594 connector test kit
Wiring diagram
Test conditions
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Page 48 of 135
24-35
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) and oxygen
sensor control, checking
Notes:
Harness connector for Oxygen Sensor (O2S)
behind Three Way Catalytic Converter (TWC):
4-pin, black
Component locations Page 24
-1
Required special tools and test equipment
VAG 1551 or VAG 1552 Scan Tool (ST) with
VAG 1551/3 adapter cable
VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VW 1594 connector test kit
Wiring diagram
Test requirements
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Page 51 of 135
24-37
- Compare display and specified values (display
fields 1 and 2):
Display fields
1 2 3 4
Display group 36: Heated Oxygen Sensor (HO2S) behind Three Way Catalytic Converter (TWC)
Display x.xxx V B1-S2 ON
B1-S2 OFF
Indicates Voltage supply to HO2S behind TWC HO2S behind TWC
ON/OFF
Range 0.000-1.000 V ---
Specified value 0.000-1.000 V
(can oscillate slightly) B1-S2 ON
If not as specified Page 24
-38
, Continuation
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Page 54 of 135
24-40
Checking HO2S reference voltage
- Disconnect 4-pin connector (black) for Oxygen
Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G108-.
If voltage is NOT OK:
If voltage is OK: - Connect multimeter US 1119 (Fluke 83 or equivalent) between harness
connector terminals 3 and 4 (to ECM), using adapter cables from VW
1594 connector test kit.
- Start engine and measure voltage.
Specified value: 0.40 to 0.50 volts
- Switch ignition off.
- Check HO2S wiring Page 24
-41
- Replace HO2S behind TWC -G108-.
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Page 55 of 135
24-41
Checking HO2S wiring
- Connect VAG 1598/22 test box to ECM harness
connector Page 01
-56
.
- Disconnect 4-pin connector (black) for Heated
Oxygen Sensor (HO2S) behind Three Way
Catalytic Converter (TWC) -G108-.
- Check wiring for open circuit between ECM/test box and 4-pin HO2S
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,
between connector, ECM/test box, and shielding for wiring harness.
Connector terminal 4 to ECM/test box socket 51
Connector terminal 3 to ECM/test box socket 2
Connector terminal 4 to ECM/test box socket 2
Specified value:
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Page 60 of 135
24-45
- Compare display and specified values (display
fields 3 and 4):
Display fields
1 2 3 4
Display group 41: Oxygen Sensor (O2S) heater, before and after Three Way Catalytic Converter (TWC)
Display
xx.x
Htg.bC.ON/Htg.bC.OFF
xx.x
Htg.aC.ON/Htg.aC.OFF
Indicates Resistance of Oxygen
Sensor (O2S) heater
before TWC O2S heater on
or
O2S heater off
(before TWC) Resistance of oxygen sensor
(O2S) heater
(after TWC) O2S heater on
or
O2S heater off
(after TWC)
Range --- ---
0.0-65.0
---
Specified
value --- ---
4.9-19.9
Htg.aC.ON
--- --- If not as specified Page
24
-46
, Continuation
---
If displayed values are OK (as specified):
-
Press button to advance program
sequence.
-
Press buttons -0- and -6- to select "End Output"
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Page 62 of 135
24-46
Continuation
- Disconnect 4-pin connector (black) for Oxygen
Sensor (O2S) 2 -G108- behind Three Way
Catalytic Converter (TWC).
If resistance is NOT OK:
If resistance is OK: - Connect multimeter US 1119 (Fluke 83 or equivalent) between HO2S
connector terminals 1 and 2, using VW 1594 connector test kit.
- Measure resistance.
Specified value: 0.00-19.9 - Replace Heated Oxygen Sensor (HO2S) behind TWC -G108-.
- Switch multimeter to 20 VDC measuring range.
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yp
e=re
pair&id=AUDI.B5.FU02.24.1