oil AUDI A4 1995 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection User Guide

01-121

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

Malfunction repair
P1393 / 17801
Ignition Coil Power
Output Stage 1
Electrical Malfunction
-----------------------
P1394 / 17802
Ignition Coil Power
Output Stage 2
Electrical Malfunction
-----------------------
P1395 / 17803
Ignition Coil Power
Output Stage 3
Electrical Malfunction
----------------------- Harness connector for Power output stage
-N122- for ignition coils 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 28
-
7

Malfunction cause found: Yes

- Erase DTC memory, test drive and after
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No
test drive, check DTC memory again

Wiring connection to Power output stage -
N122- for ignition coils or -N122- faulty

- Check Power output stage -N122- for
ignition coils page 28
-13


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
check DTC memory and
test drive check DTC memory
Note:
The power output stage is not integrated in the Engine Control Module (ECM) -J192-, it is a separate component.
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01-178
Test table display group 005 and/or display group 006 Display
fields Display on
VAG 1551
scan tool Malfunction cause
Malfunction repair
1, 2, 3, 4 Low oxygen
sensor learning
values
If first learning value in display field 1 is low, but
learning value in display fields 2, 3 and 4 normal:
oil dilution (large amount of fuel in the oil), fuel
injector leaks - Pull off cylinder block breather hose
and close
- If problem disappears after drive on
expressway and/or oil change
- Check fuel injector page 24
-29
If all four oxygen sensor learning values very low
overall:
- Fuel system pressure too high
- EVAP canister purge regulator valve -N80- open
continuously - Check system and residual pressure
page 24
-20

- Check -N80- page 24
-58
and/or
display group 009, display field 3
and/or display group 001, display field
2


Mass Air Flow (MAF) sensor -G70- faulty
Oxygen sensor (O2S) heating faulty or Heated
Oxygen Sensor (HO2S) dirty - Check MAF sensor -G70 page 24
-
81

- Check HO2S and O2S heating
page 24
-49
and/or display group 010,
display fields 1 and 2
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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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If there is engine damage (oil burning because of faulty piston)
If a knock sensor malfunction is recognized in DTC memory, ignition map switching is blocked.
Notes on display field 4:
Knock control is active starting at an engine load greater than 40% Display groups 013 and/or 014. The ignition timing point retarding values are only used when knock control is "active."
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01-196
Display groups 013 and 014
Notes on display fields 2, 3 and 4:
Knock control is active starting at an engine load greater than 40%. If the engine load exceeds 40%, the current ignition timing
point retarding value is displayed; if the engine load drops below 40%, the last values used are displayed constantly.
If there is audible knocking without recognizable retarding of the ignition timing point, the engine speed should be increased
over 3500 RPM for 5 seconds to initiate the knock sensor malfunction recognition (On Board Diagnostic).
If an ignition timing point retarding value of one cylinder deviates from the others, the following malfunctions are possible:

Loose subassemblies
Corrosion on the harness connector
Engine damage (e.g. oil combustion with faulty piston)
If there are high ignition timing point retarding values on all cylinders of bank 1 or bank 2, the following malfunctions are
possible:
Corrosion on the harness connector display groups 015 and 016 Knock sensor tightening torque, 20 Nm (14 ft lb), not OK
Open circuit display groups 015 and 016 Knock sensor faulty
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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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