1998 AUDI A4 AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-137

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

Malfunction repair
P1512 / 17920
Intake Manifold
Changeover Valve
Circ.
Short to B+ Harness connector on valve for Intake
manifold change-over valve -N156- loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
Malfunction not
displayed by the MIL Wiring connection to Intake manifold
change-over valve -N156- faulty or valve -
N156- faulty

- Check Intake manifold change-over valve -
N156- page 24
-64


Malfunction cause found: Yes
No

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

Engine Control Module (ECM) -J192- faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
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01-138

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

Malfunction repair
P1600 / 18008
Power Supply (B+)
Terminal 15
Low Voltage Battery discharged or faulty

Repair Manual, Electrical
Equipment, Repair Group 27
- Check and charge battery

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 Bad ground connection to Engine Control
Module (ECM) -J192-

- Check voltage supply to the Engine
Control Module (ECM) -J192-
page 28
-27


Malfunction cause found: Yes
No

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

Excessive current draw with ignition off (e.g.
because of luggage compartment light on
continuously, etc.)

- Carry out holding current test. The
holding current must be greater than
50 mA
For troubleshooting
Display group 001
Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
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Continued next page
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01-139


Malfunction on generator or
controller

- Check generator and controller

Malfunction cause found: Yes


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

If the malfunction "18008" is displayed as a sporadic error, disregard malfunction display! This malfunction can be stored
when the engine runs for a fairly long time in idle with a lot of consumers on if the battery is quite discharged.
The malfunction "18008" is set as soon as the supply voltage lies under 10.08 V for longer than 1 sec (the control module
does not operate under 6.5 V).
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01-140

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

Malfunction repair
P1602 / 18010
Power Supply (B+)
Terminal 30
Low Voltage The malfunction is set when the
battery/control module is disconnected
with ignition on or with a starting attempt
with ignition/control module
disconnected

- The malfunction is erased after the second engine
start if there is sufficient supply voltage. Therefore,
start car after battery/control module is
disconnected; shut off and start car again, then
check DTC memory again.

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test drive,
check DTC memory again
MIL Status:
MIL lights up
immediately Poor ground connection between
battery and body

- Check ground cable for good contact on battery
terminal and check the threaded connection on the
body

Malfunction cause found: Yes
No

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

Break in the wiring connection
between battery and Engine Control
Module (ECM) -J192-

- Check voltage supply of engine control module
page 28
-27


Malfunction cause found: Yes

- Erase DTC memory, test drive and after test drive,
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pair&id=AUDI.B5.FU01.01.1

check DTC memory again
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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:
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If a rough road is recognized by the ABS control module, the combustion misfiring recognition in the engine control
module is switched off by the "rough road info" from the ABS control module.
Pa
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jection
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yp
e=re
pair&id=AUDI.B5.FU01.01.1