1999 AUDI A4 wiring

01-169

Display
field Display on VAG
1551 scan tool Malfunction cause
Malfunction repair
3 Outside tolerance
range
Closed Throttle Position (CTP)
switch activated or faulty CTP switch or throttle position
sensor -G69- incorrectly adjusted Electrical consumers onSteering wheel at end stopDriving mode selected (automatic
transmission) Moisture in connector for -G69-Ground point on intake manifold - Check DTC memory page 01
-13
- Check and adjust -G69- page 24
-77
- Switch electrical consumers off
- Center steering wheel
- Selector lever in P or N display group 004,
display field 4 - Visual inspection
- Check ground connection according to wiring
diagram
4 0 or 1
Closed Throttle Position (CTP)
switch -F60- faulty Throttle position sensor -G69-
incorrectly adjusted Throttle sticks Floor mat presses against
accelerator pedal Moisture in connector of -G69-Accelerator pedal cable adjustment Display group 011, display field 4
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20
- Check DTC memory page 01
-13
- Check and adjust -F60- page 24
-73
- Visual inspection
- Adjust accelerator pedal cable:
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01-172

Display
field Display on VAG
1551 scan tool Malfunction cause
Malfunction repair
3 Greater than 0%
at idle
Throttle position sensor -G69- faultyAccelerator pedal cable adjustmentThrottle sticks
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20
- Check DTC memory page 01
-13
and/or
display group 002
- Adjust accelerator pedal cable:- Repair cause
At wide open
throttle less than
95%
Throttle position sensor -G69- faultyAccelerator pedal cable adjustment Throttle position sensor -G69- incorrectly
adjusted
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20
- Check DTC memory page 01
-13
and/or
display group 002
- Adjust accelerator pedal cable:- Check and adjust sensor -G69- Repair
Group 24
4 No display
Wiring connection between instrument
panel insert and Engine Control Module
(ECM) -J192- faulty Open circuit or short between Vehicle
Speed Sensor (VSS) -G68- and -J192- - Electrical Wiring Diagrams, - Check vehicle speed signal page 24
-97
- Check -G68- check vehicle speed
sensor:
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G68- faulty Troubleshooting & Component Locations
Note on display field 4:
If no vehicle speed is shown on VAG 1551 scan tool, first make sure the vehicle speed display is OK. If vehicle speed display
is faulty, check vehicle speed sensor:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-191

Display
fields Display on VAG 1551 scan tool
Malfunction cause
Malfunction repair
3/4 Display does not fluctuate-constant
between 0.0 - 0.3 V and/or between
0.6 - 0.9 V
Fuel injector faulty- Check fuel injectors page 24
-29

Spark plug faultyLarge intake air leak Engine Coolant Temperature
(ECT) sensor -G62- faulty EVAP canister purge
regulator valve -N80- - Check spark plug
- Repair cause
- Check DTC memory page 01
-13

and/or check -G62-
- Check using output diagnostic test
mode page 01
-145
and/or check -
N80-

Heated Oxygen Sensor
(HO2S) -G39- faulty or dirty Oxygen Sensor (O2S) heater
-Z19- does not function - Check DTC memory page 01
-13

and/or check -G39-
- Check -Z19- page 24
-49

Fuel system pressure too
high or too low - Check fuel pressure regulator and
residual pressure page 24
-20


Constant 2.550 V Short to positive (B+) through:
Heated Oxygen Sensor
(HO2S) -G39- wiring Engine Control Module
(ECM) -J192- - Check -G39- page 24
-49Pa
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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
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01-198
Display groups 015 and 016
Notes on display fields 2, 3 and 4:
If there is a difference of more than a factor of 3 between the lowest and the highest knock sensor signal in one display group,
the following malfunction is possible:

Corrosion on the harness connector
If there are differences of more than 50% in knock sensor signal between display group 015 (cylinders 1 to 3) and display
group 016 (cylinders 4 to 6), the following malfunctions are possible:
Corrosion on the harness connector
Open circuit
Knock sensor faulty
If no malfunctions are found during the electrical testing of the knock sensor, the wiring and the connections, the engine
should be checked for loose subassemblies or engine damage (e.g. oil burning due to faulty piston) Display groups 013
and/or 014.
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01-255

Test box VAG 1598/19, connecting


CAUTION!

Wait at least 30 seconds after the ignition has
been switched off before disconnecting the
ECM harness connector.

Note:
By disconnecting the ECM, the permanent
voltage supply is disconnected and therefore the
learning values, DTC memory and readiness
code are erased.

- Switch ignition off.

- Remove ECM.

Note:
Terminal assignments of the connectors A, B, C, D and E are identical to
the socket assignments of the test box. - Connect test box VAG 1598/19 to wiring harness.
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