fuel AUDI A8 1996 D2 / 1.G AEB Engine OBD and DTC

01-1


On Board Diagnostic (OBD)

Function

The Multiport Fuel Injection (MFI) system is
equipped with an Engine Control Module (ECM) -
J220- with On Board Diagnostic (OBD)
capability.
When malfunctions occur in sensors or
components monitored by OBD, Diagnostic
Trouble Codes (DTC) are stored in DTC
memory.
Stored DTCs are identified using the VAG 1551
Scan Tool (ST) Page 01
-15
.
After the necessary repairs are completed, DTC
memory must be erased Page 01
-40
.
OBD II legal regulations require a display
(readiness code) that shows inspection
readiness for the annual exhaust emissions test.
The readiness code shows that every component
and/or system that affects exhaust emissions,
which can lead to the Malfunction Indicator Lamp
(MIL) being switched on, has been operated at
least once with positive results.
The readiness code is reset and/or erased and
must be regenerated every time DTC memory is
erased, the power supply to the ECM -J220- is
interrupted (example: when connecting test box
Pa
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(OBD
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Fuel pump relay OK
Pa
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01-10

Notes:
If the ECM version that corresponds to the
vehicle is not displayed, replace ECM Page
01
-57
. Incorrect ECM coding leads to:

Performance problems (e.g. jerky shifting,
abrupt load changes, etc.
Increased fuel consumption
Elevated exhaust gas values
Reduction in transmission service life
Malfunctions not present are stored in DTC
memory
Necessary functions are not carried out (oxygen
sensor control, actuation of EVAP canister
system, etc.)

-
Press button to advance program
sequence.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Continue as specified in procedures for specific OBD functions.
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01-12

8D0907557 1,8L R4/5VT MOTR HS D02 Coding 06051
WSC 00000

Indicated on display (ECM identification and coding, e.g. 06051)
-
Press button to advance program sequence.
Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
The Motronic ECM -J220- only uses the code that has been entered after
the ignition has been switched off once. Incorrect coding leads to: - Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
Performance problems (e.g. jerky shifting, abrupt load changes, etc.Increased fuel consumptionElevated exhaust gas valuesFalse malfunctions stored in DTC memoryReduction in transmission service life
Pa
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01-21

Diagnostic Trouble Code
(DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0300 16684 Random/Multiple Cylinder
Misfire Detected 2 Dcy /
blink - Fuel level too low, check fuel level and add
if necessary
- Check misfire detection Page 28
-12
- Check fuel injectors Page 24
-87
- Output Diagnostic Test Mode (DTM)
Page 01
-42

- Check engine speed (RPM) sensor -G28-
Page 24
-75

P0301 16685 Cyl. 1
Misfire Detected
P0302 16686 Cyl. 2
Misfire Detected
P0303 16687 Cyl. 3
Misfire Detected
P0304 16688 Cyl. 4
Misfire Detected
P0321 16705 Ign./Distributor Eng. Speed Inp.
Circ. 2 Dcy
- Check engine speed (RPM) sensor -G28-
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Range/Performance
Page 24
-75

P0322 16706 Ign./Distributor Eng. Speed Inp.
Circ.
No Signal Immed.
Note on misfire malfunctions:
For malfunctions that may be caused by low fuel volume (i.e. combustion misfire) a low-fuel malfunction (DTC "P1250") is also
stored when there is less than 2 gallons of fuel remaining in the tank.
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01-23

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0442 16826 EVAP Emission Contr. Sys.
(Small Leak)
Leak Detected m.y. 1997:
Off
Repair Manual, Fuel Supply System,
Repair Group 20;
- Check EVAP system Page 24
-136
- Checking EVAP system for leaks using
KLI9210 EVAP tester
P0455 16839 EVAP Emission Contr. Sys.
(Gross Leak)
Leak Detected m.y. 1998 :
2 Dcy

P0456 16840 EVAP Emission Contr. Sys.
(Small Leak)
Leak Detected
Repair Manual, Fuel Supply System, Repair Group 20;
- Checking EVAP system for leaks using
KLI9210 EVAP tester
P0501 16885 Vehicle Speed Sensor
Range/Performance 2 Dcy
- Check vehicle speed signal Page 24
-
149

P0506 16890 Idle Control System
RPM Lower Than Expected 2 Dcy
- Check throttle body and throttle valve
control module Page 24
-99

P0507 16891 Idle Control System
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01-25

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1127 17535 Long Term Fuel Trim
mult., Bank1
System too Rich
1)
2
Dcy - Check Mass Air Flow (MAF) sensor -G70- Page 24
-57

- Check HO2S -G39- and O2S control Page 24
-17

- Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- Page 24
-35


- Check fuel pressure regulator and residual fuel pressure
Page 24
-93


- Check fuel injectors Page 24
-87
- Output Diagnostic Test Mode (DTM) Page 01
-42
1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
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01-26

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1128 17536 Long Term Fuel Trim
mult., Bank1
System too Lean
1)
2
Dcy - Check HO2S -G39- and O2S control Page 24
-17

- Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- Page 24
-35


- Check fuel pressure regulator and residual fuel pressure
Page 24
-93


- Check fuel injectors Page 24
-87
- Output Diagnostic Test Mode (DTM) Page 01
-42

- Check EVAP canister purge regulator valve output
Diagnostic Test Mode (DTM), page Page 01
-42

1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
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01-27

Diagnostic Trouble Code
(DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1136 17544 Long Term Fuel Trim Add.
Fuel, Bank1
System too Lean
2)
2
Dcy - Check intake air system for leaks ("false air")
Page 24
-97


- Check HO2S -G39- and O2S control Page 24
-17

- Check Mass Air Flow (MAF) sensor -G70- Page
24
-57


- Check fuel pressure regulator and residual fuel
pressure Page 24
-93


- Check fuel injectors Page 24
-87
- Output Diagnostic Test Mode (DTM) Page 01
-42
2) The term "Add." = additive; applies only with engine running at idle speed.
Pa
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)
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