AUDI A4 1998 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising User Guide

24-9


12 -
Recirculating valve for turbocharger -
N249
13 -
Fuel pressure regulator
14 -
Camshaft Position (CMP) Sensor 2 -G163
Cylinder bank 2Previously identified as Camshaft Position
(CMP) Sensor 2 -G40
15 -
Secondary Air Injection (AIR) Pump Relay
-J299 Only on vehicles with automatic
transmission
16 -
Motronic Engine Control Module (ECM) -
J220
17 -
3-pin harness connector For Engine Speed (RPM) Sensor -G28grey
18 -
3-pin harness connector For Knock Sensor (KS) 2 -G66
19 -
Harness connector for Heated Oxygen
Sensor (HO2S) 2 -G108 and Oxygen
Sensor (O2S) Heater -Z28 4-pin black
Pa
ge 11 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-10


20 -
Valve -2- for camshaft adjustment -N208
21 -
Throttle Valve Control Module -J338
With Throttle drive (power accelerator
actuation) -G186, Angle sensor -1- for
throttle drive (power accelerator actuation)
-G187 and Angle sensor -2- for throttle
drive (power accelerator actuation) -G188
22 -
Charge Air Pressure Sensor -G31 In rubber below before Throttle Valve
Control Module
23 -
Camshaft Position (CMP) Sensor 1 -G40 Cylinder bank 1Previously identified as Camshaft Position
(CMP) Sensor 1 -G163
24 -
Power output stage -N192 For ignition coils cylinder bank 2
25 -
Power output stage -N122 For ignition coils cylinder bank 1
Pa
ge 12 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-11


26 -
Valve -1- for camshaft adjustment -N205
27 -
Heated Oxygen Sensor (HO2S) -G39 with
Oxygen Sensor (O2S) Heater -Z19
28 -
Knock Sensor (KS) 1 -G61
29 -
Knock Sensor (KS) 2 -G66
30 -
Engine Speed (RPM) Sensor -G28
In transmission above sensor wheel
31 -
Heated Oxygen Sensor (HO2S) 2 -G108
and Oxygen Sensor (O2S) Heater -Z28
Pa
ge 13 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-12


32 -
Ignition coils cylinder bank 2
Ignition Coil 4 -N163Ignition Coil 5 -N164Ignition Coil 6 -N189
33 -
Fuel Injectors Cylinder bank 2Cylinder 4 Fuel Injector -N33Cylinder 5 Fuel Injector -N83Cylinder 6 Fuel Injector -N84
34 -
Intake Air Temperature (IAT) Sensor -G42 Under intake manifold at the front, near the
throttle valve control module
35 -
2-pin harness connector For intake air temperature sensor
(Measurements must be carried out at this
connection)
Pa
ge 14 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-13


36 -
Fuel Injectors
Cylinder bank 1Cylinder 1 Fuel Injector -N30Cylinder 2 Fuel Injector -N31Cylinder 3 Fuel Injector -N32
37 -
Ignition coils cylinder bank 1 Ignition Coil -NIgnition Coil 2 -N128Ignition Coil 3 -N158
38 -
Mass Air Flow (MAF) Sensor -G70
Pa
ge 15 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-14

Component location for exhaust temperature
sensors on vehicle with automatic
transmission:

Fig. 1 Component location for exhaust temperature sensors on
vehicle with automatic transmission:
1 - Sensor -1- for exhaust temperature -G235
2 - Sensor -2- for exhaust temperature -G236
Pa
ge 16 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-15


Intake manifold, removing and installing

Note:
The procedure is described for vehicles with
manual transmission. On vehicles with automatic
transmission remove also the secondary air
injection pump.
- Remove air distributor Page 24
-43
.
1 -
Unclip Wastegate Bypass Regulator Valve
-N75 from fuel rail.
Pa
ge 17 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-16


2 -
Disconnect harness connector from EVAP
Canister Purge Regulator Valve -N80.
3 -
Loosen both exhaust temperature
sensors -G235 and -G236 from intake
manifold. The sensors remain connected.
Ensure Ground cable is tight when
installing.
4 -
Loosen hose to brake booster at
bulkhead.
Pa
ge 18 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-17


5 -
Disconnect harness connector from
Recirculating valve for turbocharger -
N249.
6 -
Loosen indicated hose. The hose leads to
a vacuum reservoir.
7 -
Disconnect harness connectors of fuel
injectors from cylinder bank 1 and bank 2.
8 -
Loosen indicated hose. This hose leads to
the suction side of turbocharger bank 2.
Pa
ge 19 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-18


Repair Manual, 2.7 Liter V6 5V BiTurbo Engine
Mechanical, Engine Code(s): APB, Repair Group 15
9 -
Disconnect harness connector at Throttle
Valve Control Module -J338.
10 -
Disconnect harness connector at Charge
Air Pressure Sensor -G31.
11 -
Remove indicated pressure hoses 12 -
Loosen indicated hose, this hose leads to
bypass valve.
13 -
Disconnect harness connector at Intake
Air Temperature (IAT) Sensor -G42.
14 -
Loosen indicated hose, (crankcase
ventilation hose).
Pa
ge 20 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1