manual AUDI A4 1996 B5 / 1.G APB Engine Motronic Syst

01-10

WARNING!

When performing a road test and checks, the
vehicle diagnostic, testing and information
system VAS5051 as well as the VAG1551
may be secured only on rear seat, from
where it is to be operated by a second
technician.
Please follow safety precautions Page 24
-1

Note:
Only the procedure for OBD VAG1551 is
described below. For details of how to use the
vehicle diagnostic, testing and information
system VAS5051, please refer to its operating
manual. VAG - On Board Dia
gnostic
HELP
1 - Rapid data transfer*2 - Blink code output*

Indicated on display
* Appears alternately
Pa
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01-20

DTC
Description of malfunction
Corrective action
SAE
VAG


P0101 16485 Mass Air Flow (MAF) sensor -
G70-
Implausible signal - Check Mass Air Flow (MAF) sensor Page 24
-59
P0102 16486 Mass or Volume Air Flow
Circuit
Low input
2) - Check Mass Air Flow (MAF) sensor -G70 Page 24
-59
P0103 16487 Mass or Volume Air Flow
Circuit
High Input
2)

P0106 16490 Manifold Abs.Pressure or
Bar. Pressure
Range/Performance
2) 4)
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair
Group 21; Turbocharger; Checking Charge Air Pressure Sensor -G31
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
4) Absolute manifold pressure will be determined by the Charge Air Pressure Sensor -G31 (instead of displayed -G71), the air
pressure is determined by the Barometric Pressure (BARO) Sensor -F96 (in Engine Control Module (ECM))
Pa
ge 24 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-26

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0236 16620 Charge air pressure
sensor -G31-
Implausible signal Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s):
APB, Repair Group 21; Boost pressure system with turbocharger; charge air pressure sensor
-G31
-, checking

P0237 16621 Turbocharger Boost
Sensor (A) Circ
Low Input
2) Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 21;
Turbocharger; Checking Charge Air Pressure Sensor -G31
P0238 16622 Turbocharger Boost
Sensor (A) Circ
High Input
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 30 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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01-29

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0421 16805 Warm Up Catalyst,
Bank 1
Efficiency Below
Threshold
2) Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 26;
Components of Exhaust system removing and installing, Catalytic converter
removing and installing - Generate readiness code Page 01
-99
, if same DTC is displayed again, replace
warm up catalytic converter bank 1
P0431 16815 Warm Up Catalyst,
Bank 2
Efficiency Below
Threshold
2) Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 26;
Components of Exhaust system removing and installing, Catalytic converter
removing and installing - Generate readiness code Page 01
-99
, if same DTC is displayed again, replace
warm up catalytic converter bank 1
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Important note:
The warm up catalytic converters are located between the two oxygen sensors of the relevant cylinder bank. The warm up
catalytic converters (little smaller than main catalytic converter) are located closer to the engine, not to be misunderstood with
the main catalysts you see immediately once the vehicle is lifted.
Pa
ge 35 of 166 Motronic s
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gnostic
(OBD
)
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01-30

DTC
Description of
malfunction
Corrective action
P0441 16825 EVAP Emission Contr.
Sys. Incorrect
Purge Flow
2) - Check EVAP canister purge regulator valve, perform output Diagnostic Test
Mode (DTM) Page 01
-75

P0442 16826 EVAP Emission Contr.
Sys. (Small Leak)
Leak Detected
2) - Check EVAP system and tank system for leaks
P0455 16839 EVAP Emission Contr.
Sys. (Gross Leak)
Leak Detected Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP
system servicing, carry out tank leak test

P0456 16840 Tank ventilation system
Pin-hole leak detected
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 20;
Fuel supply, gas engine; EVAP canister system components, servicing; tank leak diagnostic, performing.
- Checking fuel supply and ventilation systems for leaks
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 36 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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yp
e=re
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01-31

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0501 16885 Vehicle Speed Sensor
Range/Performance
2) - Check Vehicle Speed Signal (VSS) Page 24
-182
P0506 16890 Idle Control System
RPM Lower than
Expected
2) - Carry out adaptation of Throttle Valve Control Module Page 24
-146
P0507 16891 Idle Control System
RPM Higher than
Expected
2) - Check for unmetered (false) air Page 24
-76
P0560 16944 System Voltage
Malfunction - Check control module voltage supply Page 28
-32
P0562 16946 System Voltage
Low Voltage

P0563 16947 System Voltage
High Voltage

P0571 16955 Cruise/Brake Switch (A)
Circ.
Incorrect Signal Repair Manual, Electrical Equipment, Repair Group 01, On Board
- Check brake light switch and/or brake pedal switch Page 24
-185
Pa
ge 37 of 166 Motronic s
ystem, On Board Dia
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(OBD
)
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01-43

DTC
Description of malfunction
Corrective action
SAE
VAG


P1250 17658 Fuel Level
Too Low
4)
Repair Manual, Electrical Equipment, Repair Group 01
- Fill fuel tank and erase DTC memory
- Check DTC memory from instrument cluster.
4) The malfunction "Fuel Level too Low" will be stored if the fuel level in the tank is or was too low. The malfunction remains as
a static malfunction and will not be set a sporadic malfunction even if the customer fills the tank with fuel in the meantime.
Therefore it is possible to recognize malfunctions which have been stored due to lack of fuel e.g.: misfiring or malfunction
regarding oxygen sensor control.
Pa
ge 53 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-44

DTC
Description of malfunction
Corrective action
SAE
VAG


P1287 17695 Turbocharger bypass valve
Open
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine
Code(s): APB, Repair Group 21, checking Recirculating valve for turbocharger
- Check recirculating valve for turbocharger -N249
P1288 17696 Turbocharger bypass valve
Short to B+

P1289 17697 Turbocharger bypass valve
Short to Ground

P1296 17704 Cooling System
Malfunction
2)
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine
Code(s): APB, Repair Group 19, Cooling, Components for cooling system, engine side
- Check Engine Coolant Temperature (ECT) sensor Page 28
-25
P1297 17705 Charger/throtle-valve
connection, Pressure loss - Check hoses between turbocharger and throttle valve:
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine
Code(s): APB, Repair Group 21; Turbocharger

2) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Significance of MIL Page 01
-3 .
Pa
ge 54 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-52

DTC
Description of
malfunction
Corrective action
SAE
VAG


P1391 17799 Camshaft Pos.
Sensor, Bank2
Short to Ground
2) - Check Camshaft Position (CMP) sensor Page 28
-45
P1392 17800 Camshaft Pos.
Sensor, Bank2
Open Circ./Short to B+
2)
P1410 17818 Tank Ventilation Valve
Circ.
Short to B+ - Check EVAP canister purge regulator valve Page 24
-134
P1411 17819 Sec. Air
Inj.Sys.,Bank2
Flow too low
2)
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s):
APB, Repair Group 26, Exhaust system, Secondary air injection system
- Check fuse for secondary air injection pump.
- Check vacuum hoses
- Check piping from pump to secondary air injection valve (Combi valve)
P1414 17822 Sec. Air
Inj.Sys.,Bank2
Leak Detected
2)
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s):
APB, Repair Group 26, Exhaust system, Secondary air injection system
- Check piping from pump to secondary air injection valve (combi valve) bank 2Pa
ge 62 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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pair&id=AUDI.B5.FU04.01.1

01-53

DTC
Description of
malfunction
Corrective action
SAE
VAG


P1420 17828 Sec. Air Inj. Valve
Circ.
Electrical
Malfunction
2) - Check Secondary Air Injection (AIR) Solenoid Valve -N112
P1421 17829 Sec. Air Inj. Valve
Circ.
Short to Ground
2) Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s): APB,
Repair Group 26, Exhaust system, Secondary air injection system, Checking Secondary Air Injection (AIR) Solenoid Valve
-N112

P1422 17830 Sec. Air Inj. Valve
Circ.
Short to B+
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 64 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1