AUDI A4 1999 B5 / 1.G APB Engine Motronic Syst

01-74

DTC
Description of malfunction
Corrective action
SAE
VAG


P1851 18259 Data Bus Powertrain
Missing Message from Brake Contr
Repair Manual, Brake System On Board Diagnostic (OBD), Repair
Group 01, checking DTC memory of ABS control module
- Check DTC memory of ABS control module
- Check data exchange between Engine-/ABS-
/Transmission control
module Page 24
-201

P1853 18261 Data Bus Powertrain
Unplausible Message from Brake
Contr.
P1854 18262 Data Bus Powertrain
Hardware Defective
P3262 19718 Exhaust bank 1/2 oxygen sensors
behind catalytic converter
mixed up - Check harness connectors for oxygen sensors and check installed
position of oxygen sensors behind catalytic converter. 1) With this malfunction the EPC (Electronic Power Control) Malfunction Indicator Light (MIL) in the instrument cluster is
switched on by the ECM. Significance of EPC malfunction indicator light Page 24
-142
.
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 91 of 166 Motronic s
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)
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01-75

Output Diagnostic Test Mode (DTM)


Notes:

The DTM can only be performed with the
ignition switched on and the engine not running.
The DTM is terminated if the engine is started
or if an engine speed pulse is detected.
During the DTM, individual control elements will
be activated for approx. 1 minute, or until the
test program is advanced to the next control
element by pressing the button.

The control elements can be tested either by
listening or by touching.
If the DTM is to be repeated, the engine must
be started. The engine control module needs to
detect an engine speed of more than 300 rpm.
The electric fuel pump runs continuously
throughout the DTM.
Pa
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01-76

The DTM activates the following components
in the stated sequence:

Activation sequence
1. EVAP Canister Purge Regulator Valve -
N80-
2. Secondary Air Injection (AIR) Solenoid
Valve -N112-
(This display appears only on vehicles with
automatic transmission)
3. Secondary Air Injection (AIR) Pump Relay -
J299-
(This display appears only on vehicles with
automatic transmission)
4. Wastegate Bypass Regulator Valve -N75
5. Camshaft adjustment
6. Leak Detection Pump for EVAP system
7. Recirculating valve for turbocharger -N249
8. Cylinder 1 Fuel Injector -N30
9. Cylinder 4 Fuel Injector -N33
10. Cylinder 3 Fuel Injector -N32
11. Cylinder 6 Fuel Injector -N84
12. Cylinder 2 Fuel Injector -N31
Pa
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13. Cylinder 5 Fuel Injector -N83
Pa
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01-77

Test requirements

Fuses for engine electronics OK
Fuel pump relay OK

- Connect vehicle diagnostic, testing and
information system VAS 5051 or VAG1551 scan
tool and select engine electronics control
module by entering address word "01" Page 01
-9 . When doing this the ignition must be
switched on.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select function "Output Diagnostic Test
Mode."
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
Pa
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01-78

Actuating EVAP Canister Purge Regulator
Valve -N80

- Confirm input with -Q- button.Output Diagnostic Test Mode EVAP canister pur
ge re
gulator valve -N80

Indicated on display
This solenoid valve will continue to be actuated (i.e. will click) until the
button is pressed to advance program to next control element.
If the solenoid valve is not actuated (does not click): - Check EVAP Canister Purge Regulator Valve -N80 Page 24
-134
.
Pa
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01-79

Actuating Secondary Air Injection (AIR)
Solenoid Valve -N112

Note:
Only vehicles with automatic transmission are
equipped with a secondary air injection system.
Vehicles with manual transmission do not have a
secondary air injection system. For this reason
are on vehicles with manual transmission the
following components Secondary Air Injection
(AIR) Solenoid Valve -N112 and Secondary Air
Injection (AIR) Pump Relay -J299 not displayed.

-
Press button.Output Diagnostic Test Mode Secondar
y Air
(AIR
) Injection valve -N112

Indicated on display
This solenoid valve will continue to be actuated (i.e. will click) until the
button is pressed to advance the program to the next control element.
If the secondary air injection valve does not click:
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s): APB, Repair Group 26, Checking secondary air injection valve

- Check Secondary Air Injection (AIR) Solenoid Valve -N112
Pa
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01-80

Actuating Secondary Air Injection (AIR) Pump
Relay -J299

Note:
Only vehicles with automatic transmission are
equipped with a secondary air injection system.
Vehicles with manual transmission do not have a
secondary air injection system. For this reason is
on vehicles with manual transmission the
following component Secondary Air Injection
(AIR) Pump Relay -J299 not displayed.

-
Press button.Output Diagnostic Test Mode Secondar
y air pump rela
y -J299

Indicated on display
If the Secondary Air Injection (AIR) Pump Motor -V101- does not run at
intervals:
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s): APB, Repair Group 26, Checking Secondary Air Injection (AIR) Pump Relay
-J299
The Secondary Air Injection (AIR) Pump Relay -J299- activates the
Secondary Air Injection (AIR) Pump Motor -V101-, which runs for
approx: 1 minute at intervals.
- Check Secondary Air Injection (AIR) Pump Relay -J299.
Pa
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01-81

Activating Wastegate Bypass Regulator Valve
-N75-

-
Press button.Output Diagnostic Test Mode Wastegate bypass regulator valve -N75

Indicated on display
This solenoid valve is activated for 1 minute (clicks), unless button is
pressed first to switch to the next actuator.
If valve is not activated (does not click):
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s): APB, Repair Group 21, Turbocharger, Checking Wastgate Bypass Regulator Valve
-N75

Actuating camshaft adjustment valves -N205-, -N208-
-
Press button.
Output Diagnostic Test Mode Camshaft Ad
justment

Indicated on display
If camshaft adjustment valve 1 or 2 is not activated:
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s): APB, Repair Group 15, Camshaft adjustment, checking camshaft adjustment valves
- Camshaft adjustment valves 1 and 2 (-N205 and -N208) will continue
to be activated (or will click) for about 1 minute.
Pa
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01-82

Actuating Leak Detection Pump (LDP) -V144-

-
Press button.Output Diagnostic Test Mode EVAP s
ystem leak detection pump

Indicated on display
The change over valve in the LDP is activated for approximately 1 minute
(clicks), unless the button pressed to switch to the next actuator.
Note:
The clicking can be heard by listening in the area of the left rear wheel
housing.
If valve is not actuated (does not click):
Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP system servicing, Checking Leak Detection Pump (LDP)
-V144

Pa
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ystem, On Board Dia
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)
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