light AUDI A4 1998 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Manual Online

01-131

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

Malfunction repair
P1505 / 17913
CTP Switch does not
Close
Open Circuit Floor mat presses on gas pedal

- Visual inspection

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately Throttle cable set too tight

Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20, Adjust throttle cable

- Adjust throttle cable

Malfunction cause found: Yes
No

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

Harness connector on -G69- and Closed
Throttle (CTP) switch -F60- 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
For troubleshooting
Malfunction cause found: Yes

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01-133

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

Malfunction repair
P1506 / 17914
CTP Switch does not
Open
Short to Ground Harness connector on Throttle Position (TP)
sensor -G69- and Closed Throttle (CTP) switch -
F60- 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

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
MIL Status:
MIL lights up
immediately Closed Throttle (CTP) switch -F60- in the
Throttle Position Sensor does not open or is
faulty

- Check and adjust idle switch page 24
-73

Note:
Malfunction P0120 /
16504 is also stored Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
For troubleshooting
Display groups 000,
002, 004
Engine Control Module (ECM) -J192- faulty

- Replace and code engine control
module page 01
-265
erase DTC
memory and test drive check DTC
memory
Note:
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01-134

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

Malfunction repair
P1509 / 17917
IAC Circ.
Electrical Malfunction Harness connector on Idle Air Control
(IAC) valve -N71- 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:
MIL lights up
immediately
Wiring connection to Idle Air Control
(IAC) valve -N71- faulty or valve -N71-
faulty

- Check Idle Air Control (IAC) valve -N71-
page 24
-37


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
For troubleshooting
Display group 018
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Note:
If a malfunction is recognized in the electrical circuit, both power output stages ("+" and "-" output) are switched off. The Idle
Air Control (IAC) -N71- has no power and opens the limp home cross section.
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01-135

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

Malfunction repair
P1510 / 17918
IAC Circ.
Short to B+ Harness connector for Idle Air Control
(IAC) valve -N71- 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:
MIL lights up
immediately
Wiring connection to Idle Air Control
(IAC) valve -N71- faulty or valve -N71-
faulty

- Check Idle Air Control (IAC) valve -N71-
page 24
-37


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
For troubleshooting
Display group 018
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Note:
If a malfunction is recognized in the electrical circuit, both power output stages ("+" and "-" output) are switched off. The idle
stabilizer valve -N71- has no power and opens the limp home cross section.
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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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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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01-142

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

Malfunction repair
P1611 / 18019
MIL Call-up Circ./
Transm.Control Module
Short to Ground Wiring connection between Engine
Control Module (ECM) -J192- and
Transmission Control Module (TCM) -J217-
faulty

- Check MIL wiring from Transmission
Control Module (TCM) -J217- page 24
-
105


Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
MIL Status:
MIL lights up
immediately Transmission Control Module (TCM) -
J217- faulty

Repair Manual, 5 Spd. Automatic
Transmission 01V On Board Diagnostic (OBD), Repair Group 01
- Replace Transmission Control Module
(TCM) -J217-

Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
For troubleshooting
Display group 027
Engine Control Module (ECM) -J192-
faulty

- Replace and code ECM -J192- page 01
-265
erase DTC memory and take
test drive check DTC memory
Notes:
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01-144

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

Malfunction repair
P1613 / 18021
MIL Call-up Circ.Open
Short to B+ Wiring connection between Engine
Control Module (ECM) -J192- and
Transmission Control Module (TCM) -J217-
faulty

- Check MIL wiring from Transmission
Control Module (TCM) -J217- page 24
-
105


Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
MIL Status:
MIL lights up
immediately
Transmission Control Module (TCM) -
J217- faulty

Repair Manual, 5 Spd.
Automatic
Transmission 01V On Board Diagnostic (OBD), Repair Group 01
- Replace ABS control module -J104-

Malfunction cause found: Yes
No

- Erase DTC memory, take test drive, after
test drive check DTC memory again
For troubleshooting
Display group 027
Engine Control Module (ECM) -J192-
faulty

- Replace and code ECM -J192- page 01
-265
erase DTC memory and take
test drive check DTC memory
Notes:

This malfunction can only occur in connection with an automatic transmission.
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01-183
Notes on display field 1 (cont'd):
The oxygen sensor control stop evaluation is also done by the diagnosis only after successful learning learning
requirement display:
Control stop max.: + 32%
Control stop min.: - 87.5%
With values of more than 20% in "Basic Setting" function 04, the following malfunctions are possible: Intake air leaks
Engine damage (oil burning with faulty piston)
Notes on display field 2:
In display field 2 (learning range display), the momentary learning range (load status) is displayed. Only idle and partial
throttle learning ranges are displayed since, at wide open throttle, no learning takes place.
In order to reach the corresponding learning range (load status):
Idle: the vehicle should be allowed to run at idle (650-900 RPM)
Partial throttle 1, 2 or 3: during test drive (with second person), increase engine speed to 1500-3000 RPM and generate
load by lightly operating the brake
X
X
X
X
Meaning of 4-digit learning range display
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01-204
Display group 022
Notes:
Display group 022 should only be considered on vehicles with traction control (ATC).
Vehicles with traction control (ATC) can be recognized by the ATC indicator light in the instrument cluster and/or ABS (ATC)
On Board Diagnostic (OBD).
Repair Manual, Brake System On Board Diagnostic (OBD), Repair Group 01.

The wheel slip information for traction control (ATC) is calculated in the ABS control module. If slip is recognized, the ABS
control module requests a reduction in torque from the Engine Control Module (ECM). This torque reduction is divided into 12
reducing stages.
With a cold engine, coolant temperature less than 20 C (68 F), the reduction of engine torque is obtained:
With retarded ignition timing angle for lower reducing stages (1-5)
By brief shut-off of individual fuel injectors for higher reducing stages (6-12)
If the engine is warm, coolant temperature greater than 40 C (104 F), the engine torque reduction is obtained only by briefly
switching off individual fuel injectors.
Display shows
Display/specified value
Designation
Basic setting 22
1 2 3 4 0 - 12 1 = Reducing stages

_._ crankshaft
2 = Ignition timing point retarded by ATC (only with cold engine)
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