air condition AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection User Guide

01-24

Diagnostic Trouble Code
(DTC) Malfunction text
MIL switching
condition
SAE
VAG
P1396 17804 Engine Speed Sensor Missing Tooth immediately
P1400 17808 EGR Valve Circ. Electrical Malfunction immediately
P1402 17810 EGR Valve Circ. Short to B+ immediately
P1407 17815 EGR Temp.Sensor Signal too Low immediately
P1408 17816 EGR Temp.Sensor Signal too High immediately
P1409 17817 Tank Ventilation Valve Electrical Malfunction immediately
P1410 17818 Tank Ventilation Valve Short to B+ immediately
P1500 17908 Fuel Pump Relay Circ. Electrical Malfunction immediately
P1504 17912 Intake Air Sys.Bypass Air Determined immediately
P1505 17913 CTP Switch does not Close Open Circuit immediately
P1506 17914 CTP Switch does not Open Short to Ground immediately
P1509 17917 IAC Circ. Electrical Malfunction immediately
P1510 17918 IAC Circ. Short to B+ immediately
P1511 17919 Intake Manifold Changeover Valve Circ. Electrical
Malfunction off
P1512 17920 Intake Manifold Changeover Valve Circ. Short to B+ off
Pa
ge 35 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-25

Diagnostic Trouble Code
(DTC) Malfunction text
MIL switching
condition
SAE
VAG
P1600 18008 Power Supply (B+) Terminal 15 Low Voltage off
P1602 18010 Power Supply (B+) Terminal 30 Low Voltage immediately
P1606 18014 Rough Road Spec Engine Torque ABS-SG Electrical
Malfunction off
P1611 18019 MIL Call-up Circ./Transm. Control Module Short to Ground immediately
P1612 18020 ECM Incorrectly Coded immediately
P1613 18021 MIL Call-up Circ.Open Short to B+ immediately
P1746 00532 Repair Manual, 5 Spd. Automatic Transmission 01V

P1748 65535 Repair Manual, 5 Spd. Automatic Transmission 01V
P1813 00264 Repair Manual, 5 Spd. Automatic Transmission 01V
P1818 00266 Repair Manual, 5 Spd. Automatic Transmission 01V
P1823 00268 Repair Manual, 5 Spd. Automatic Transmission 01V
P1828 00270 Repair Manual, 5 Spd. Automatic Transmission 01V Pa
ge 36 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-26
Diagnostic Trouble Code (DTC) table


Following are all the possible malfunctions that can be recognized by the Engine Control Module (ECM) -J192- and
printed on the VAG 1551 scan tool printer, listed according to code identifier ( SAE and VAG codes).
Malfunctions that switch the MIL on never or immediately are set as "sporadic" each time the engine is started. If the
malfunction occurs again, the "sporadic" status is set again. For malfunctions that only switch the MIL on after two trips
with malfunction, the "sporadic" status is only erased after an OK diagnosis.
If the MIL lights up with engine running, there is a malfunction that makes the exhaust gas worse. If the MIL lights up and
the engine is running, there must in any case be a malfunction stored in the DTC memory of the engine control module
and/or of the transmission control module. In this case, the DTC memory of the engine control module and/or the
transmission control module must be checked.
If the MIL starts to blink, there is a malfunction present that can lead to three way catalytic converter damage (e.g.
combustion misfiring with high misfiring rate). In this case, the trip should be continued with reduced power (until the MIL
goes out or lights up continuously) and the malfunction should be eliminated as quickly as possible.
The malfunction is not stored in the DTC memory immediately and the MIL is not switched on immediately with some
malfunction types, but only after two successive trips with or without preceding cold start (-10 to 30 C (14 to 86 F)
and malfunction occurring (malfunction recognition twice). The MIL switching condition is always specified in the Diagnostic Trouble Code (DTC) table.
Combustion misfiring with high misfiring rate is displayed immediately with the MIL blinking, since the three way catalytic
converters can be damaged. In this case, driving should continue only with reduced power and the malfunction should be
eliminated as soon as possible.
Pa
ge 37 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-77


EGR vacuum regulator solenoid valve -N18- sticks
in closed position

- Check EGR vacuum regulator solenoid valve -N18-
page 24
-67


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test drive, check
DTC memory again

EGR valve sticks in closed position

- Check mechanical EGR valve page 24
-70

Malfunction cause found: Yes


- Erase DTC memory, test drive and after test drive, check
DTC memory again
Notes:

Recognition condition for the malfunction "P0401 / 16785" (mech. valve continuously closed) is a coolant temperature over
72 C (162 F), an open idle switch, a throttle angle less than 42.5 , a vehicle speed between 70 km/h and 105 km/h (44
and 66 mph), an EGR duty cycle greater than 50%, an engine speed between 1500 RPM and 3300 RPM and an engine
load between 23% and 60%. If all these conditions are fulfilled and the EGR temperature signal is less than 50 C (122
F) for longer than 34 sec, the malfunction "P0401 / 16785" is set.
Pa
ge 104 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-141

Output on GST
and/or on VAG 1551
scan tool Possible malfunction cause

Malfunction repair
P1606 / 18014
Rough
Road/Acceleration
Sensor
Electrical Malfunction Was an exhaust test carried out in
which only the front axle was moved
and the rear axle was stationary?

- These conditions cause a malfunction to be
stored in the DTC memory. During exhaust tests,
the fuse must be removed from the ABS control
module. After the exhaust test, ABS control module
and engine control module DTC memory must be
erased.

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
MIL Status:
Malfunction not
displayed by MIL If there are ABS system
malfunctions, the malfunctions P1606 /
18014 are also stored in the engine
control module. Is a malfunction stored
in the ABS control module?

Repair Manual, Brake System On Board
Diagnostic (OBD), Repair Group 01, On Board Diagnostic (OBD)
- Check DTC memory of ABS control module

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again

Wiring connection between Engine
Control Module (ECM) -J192- and
ABS control module -J104- faulty

- Check signal for rough road recognition from ABS
control module for ABS/EDL and/or ABS/ASR
page 24
-109

Notes:
Pa
ge 191 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-160

Display
group Display
shows Designation
025 Basic setting
25
1 2 3 4 Used only for production and not for customer service
026 Basic setting
26
1 2 3 4 Used only for production and not for customer service
027 Basic setting
27
1 2 3 4 Fuel level display
028 Basic setting
28
1 2 3 4 Used only for production and not for customer service
029 Basic setting
29
1 2 3 4 Diagnostic status (readiness code)
030 Basic setting
30
1 2 3 4 Evaporative emissions (EVAP) system diagnosis (only on vehicles with sensor for EVAP
canister -G172-)
031 Basic setting
31 Operating conditions when combustion misfiring recognized
Pa
ge 222 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-161

Display
group Display
shows Designation
036 Basic
setting 36
1 2 3 4 Three way catalytic convertor diagnosis, bank 2
037 Basic
setting 37
1 2 3 4 Sensor wheel learning value
038 Basic
setting 38
1 2 3 4 Current data on combustion misfiring recognition
039 Basic
setting 39
1 2 3 4 Statistical data on combustion misfiring recognition
040 Basic
setting 40
1 2 3 4 Heating current of heated oxygen sensors in front of and behind three way catalytic convertors
041 Basic
setting 41
1 2 3 4 Voltage signals of heated oxygen sensors in front of and behind three way catalytic convertor
042 Basic
setting 42 Diagnostic conditions for diagnosing the flank rise and flank fall time (response time) of the
voltage signals of the heated oxygen sensors in front of three way catalytic convertors
Pa
ge 224 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

1 2 3 4
043 Basic
setting 43
1 2 3 4 Current flank rise and flank fall time (response time) of the voltage signals of the heated oxygen
sensors in front of three way catalytic convertors
044 Basic
setting 44
1 2 3 4 Conditions for three way catalytic convertor diagnosis (bank 1 and bank 2)
045 Basic
setting 45
1 2 3 4 Evaporative emissions (EVAP) system/tank diagnosis (only on vehicles with diagnosis pump for
fuel system -V144-)
Pa
ge 225 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-192

Display
fields Display on VAG 1551 scan tool
Malfunction cause
Malfunction repair
3/4
Constant value between 0.350 -
0.450 V Open circuit in:
Heated Oxygen Sensor (HO2S) -G39-
wiring Engine Control Module (ECM) -J192-- Check -G39- page
24
-49


Constant 0.000 V Short to ground in:
Heated Oxygen Sensor (HO2S) -G39-
wiring Engine Control Module (ECM) -J192-- Check -G39- page
24
-49


Notes on display field 4:
The display value at times must drop below 0.3 V
and exceed 0.6 V. Display values less than 0.40
V indicate lean condition; greater than 0.40 V
indicate rich condition.

HO2S voltage U (mV) vs. Lambda ( ) A - HO2S voltage (mV) high
Rich mixture (fuel excess or lack of air)
High CO value
B - Oxygen sensor probes voltage (mV) low
Pa
ge 269 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-199
Display group 017
Note:
If in display group 029, display field 1, the value of the EGR system throughput diagnosis is not set to "0" during the
regeneration of the "readiness code," and/or a malfunction relating to the exhaust system is stored in the DTC memory,
display group 017 is used to carry out a selective diagnosis.
During cold start at idle, -10 C to 30 C (14 to 86 F), and during "Basic Setting" function 04, no exhaust gas recirculation
takes place. Since exhaust gas recirculation is switched off automatically during "Basic Setting" function 04, diagnosis of EGR
throughput is evaluated only in "Read Measuring Value Block." function 08. If diagnostic conditions are fulfilled, the Engine Control Module (ECM) checks the flow through the EGR system after each
start. The diagnostic conditions are only reached during a trip at 80-100 km/h (50-63 mph) in 4th or 5 gear and/or with selector
lever in the "D"position, preferably in 4th gear position. If the diagnostic conditions are fulfilled, the diagnosis is active. In order
to get a diagnostic result, the vehicle must be driven approx. 1-1/2 to 5 minutes under the diagnostic conditions. However, the
diagnosis is only considered OK when the EGR temperature (display field 4) is greater than 50 C (122 F) during the reading
time (display field 2). Diagnosis of the EGR flow (exhaust gas recirculation quantity) is active as soon as the following diagnostic conditions are
fulfilled:

Coolant temperature: greater than 8 C (46 F) ( display group 001) Vehicle speed: constant drive
Engine speed: 2000-3000 RPM ( display group 003) Engine load: 30-60%
Pa
ge 280 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1