sensor AUDI A6 1995 C5 / 2.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
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Mode 5 shows the statistical value of the oxygen sensors as mandated by law. As these values have no direct bearing on
oxygen sensor diagnosis, Mode 5 is of no particular value in an Audi Service department.
Under Mode 6, values can be checked for components and systems that are not continuously monitored.
With Mode 7 all malfunctions can be checked, even if they have not switched on the Malfunction Indicator Lamp (MIL) (if
the MIL has not been switched on, there is no malfunction recognized under Mode 3)
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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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01-18

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



P0102 16486 Mass or Volume Air Flow Circ.
Low Input 2
Dcy - Check Mass Air Flow (MAF) sensor -G70-
Page 24
-57

P0103 16487 Mass or Volume Air Flow Circ.
High Input
P0107 16491 Manifold Abs. Pressure or Bar.
Pressure
Low Input 2
Dcy - Check Manifold Absolute Pressure (MAP) sensor
-G71- Page 24
-131

P0108 16492 Manifold Abs. Pressure or Bar.
Pressure
High Input
P0112 16496 Intake Air Temp. Circ.
Low Input 2
Dcy - Check Intake Air Temperature (IAT) sensor -G42-
Page 24
-69

P0113 16497 Intake Air Temp. Circ.
High Input
P0116 16500 Engine Coolant Temp. Circ.
Range/Performance 2
Dcy - Check Engine Coolant Temperature (ECT)
sensor -G62- Page 24
-63

P0117 16501 Engine Coolant Temp. Circ.
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01-19

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



P0121 16505 Throttle/Pedal Pos. Sensor A
Circ.
Range/Performance 2
Dcy - Check Throttle Position (TP) sensor -G69- Page 24
-99

P0122 16506 Throttle/Pedal Pos. Sensor A
Circ.
Low Input
P0123 16507 Throttle/Pedal Pos. Sensor A
Circ.
High Input
P0130 16514 O2 Sensor Circ., Bank1-
Sensor1
Malfunction 2
Dcy - Check Heated Oxygen Sensor (HO2S) -G39- and
O2S control Page 24
-17

P0131 16515 O2 Sensor Circ., Bank1-
Sensor1
Low Voltage
P0132 16516 O2 Sensor Circ., Bank1-
Sensor1
High Voltage
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P0133 16517 O2 Sensor Circ., Bank1-
Sensor1
Slow Response 2
Dcy - Check Heated Oxygen Sensor (HO2S) aging
Page 24
-51

P0134 16518 O2 Sensor Circ., Bank1-
Sensor1
No Activity Detected 2
Dcy - Check HO2S -G39- and O2S control Page 24
-17
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01-20

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



P0136 16520 O2 Sensor Circ., Bank1-
Sensor2
Malfunction 2
Dcy - Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- Page 24
-35

P0137 16521 O2 Sensor Circ., Bank1-
Sensor2
Low Voltage
P0138 16522 O2 Sensor Circ., Bank1-
Sensor2
High Voltage
P0140 16524 O2 Sensor Circ., Bank1-
Sensor2
No Activity Detected
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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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01-22

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



P0327 16711 Knock Sensor 1
Circ.
Low Input Immed.
- Check knock sensors and knock sensor control Page 28
-5
P0332 16716 Knock Sensor 2
Circ.
Low Input
- Check knock sensors and knock sensor control Page 28
-5
P0422 16806 Main Catalyst,
Bank1
Efficiency Below
Threshold 2 Dcy
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical,
Engine Code(s): AEB, ATW, Repair Group 26.
- Replace Three Way Catalytic Converter (TWC):
P0441 16825 EVAP Emission
Contr. Sys.
Incorrect Purge
Flow 2 Dcy
- Check Evaporative Emissions (EVAP) canister purge regulator
valve output Diagnostic Test Mode (DTM), page Page 01
-42

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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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