diagram AUDI A4 1997 B5 / 1.G AEB Engine OBD and DTC

01-3

Checking function

- Switch ignition on.

MIL must light up.

- If MIL does not light when ignition is switched
on, check wiring to MIL as follows: Cause:
MIL is not triggered, or does not light, due to faulty
wiring or open circuit. Remedy:
- Switch ignition off.
- Connect VAG 1598/22 test box.
- Connect jumper wire to bridge test box sockets 2 and 17.
- Switch ignition on.
MIL must light up.
If MIL does not light:
- Switch ignition off.
- Check bulb for MIL.
If bulb is OK:
- Check wiring for open circuit between MIL and Motronic ECM -
J220- using applicable wiring diagram.
Pa
ge 4 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-4
If MIL lights up when ignition is switched on,
continue checking as follows:

- Start engine and let run at idle.

MIL must go out after a few seconds.
If MIL does not go out:

- Check Diagnostic Trouble Code (DTC) memory
Page 01
-15
.
If there are no malfunctions stored in DTC
memory: Cause:
MIL is triggered continuously due to short
circuit to Ground. Remedy:
- Switch ignition off.
- Connect VAG 1598/22 test box.
- Check resistance between test box socket 17 and vehicle Ground,
specified value: (no continuity) If the specified value is not obtained:
- Check for short circuit to Ground in wiring from Motronic Engine Control
Module (ECM) -J220- to MIL.
- Trace malfunction using applicable wiring diagram and repair as
necessary.
Pa
ge 6 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-7

VAG 1551/ VAG 1552 Scan Tool (ST),
connecting and selecting "Engine
Electronics" address word 01


Required special tools and test equipment

VAG 1551 Scan Tool (ST) with VAG 1551/3
adapter cable

Note:
VAG 1552 scan tool can be used instead of VAG
1551, however there is no print-out capability.

Requirements
Fuses for engine electronics OK
Battery Positive Voltage (B+) OK (at least 11
volts)
Engine and transmission Ground
connections OK

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

Pa
ge 12 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-31

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1250 17658 Fuel Level
Too Low Off
- Fuel volume less than 2 gallons, add fuel.

Electrical Wiring Diagrams, Troubleshooting & Component
Locations - Check wiring between ECM and instrument cluster

Repair Manual, Electrical Equipment, Repair Group 01
- Check signal from fuel gauge, and fuel gauge
P1297 17705 Connection charger-
throttle valvle
Pressure drop
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical,
Engine Code(s): AWM, Repair Group 21; Charge Pressure, Leak test with VAG 1687
- Check air pressure system using VAG 1687 charge air system
tester
Note on misfire malfunctions:
For malfunctions that may be caused by low fuel volume (i.e. combustion misfire) a low-fuel malfunction (DTC "P1250") is also
stored when there is less than 2 gallons of fuel remaining in the tank.
Pa
ge 46 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-38

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1611 18019 MIL Call-up Circ./Transm.
Contr. Module
Short to Ground 2
Dcy
Electrical Wiring Diagrams, Troubleshooting &
Component Locations - Check wiring between TCM and ECM
P1612 18020 Electronic Control Module
Incorrect Coding Off
- Code Motronic ECM Page 01
-11
P1613 18021 MIL Call-up Circ.
Open/Short to B+ 2
Dcy
Repair Manual, 5 Spd. Automatic Transmission 01V On
Board Diagnostic (OBD), Repair Group 01

Electrical Wiring Diagrams, Troubleshooting &
Component Locations - Check DTC memory for Transmission Control Module
(TCM) and correct malfunctions
- Check wiring between TCM and ECM
Pa
ge 56 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1