fuel AUDI A4 1998 B5 / 1.G APB Engine Motronic Syst

01-58

DTC
Description of
malfunction
Corrective action
SAE
VAG


P1470 17878 EVAP Emission Contr.
LDP Circ
Electrical Malfunction
2) - Check Leak Detection Pump (LDP)
P1471 17879 EVAP Emission Contr.
LDP Circ
Short to B+
2) Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP
system servicing, Checking Leak Detection Pump (LDP)
-V144

P1472 17880 EVAP Emission Contr.
LDP Circ
Short to Ground
2)
P1473 17881 EVAP Emission Contr.
LDP Circ
Open Circuit
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 70 of 166 Motronic s
ystem, On Board Dia
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(OBD
)
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01-59

DTC
Description of malfunction
Corrective
SAE
VAG


P1475 17883 EVAP Emission Contr. LDP
Circ
Malfunction/Signal Circ.
Open
2) - Check hoses (pressure/vacuum) to leak detection pump
- Check wiring to pump according to wiring diagram
P1476 17884 EVAP Emission Contr. LDP
Circ
Malfunction/Insufficient
Vacuum 2) Repair Manual, Fuel Supply System, Repair Group 20, Components of
EVAP system servicing, Diagram of EVAP system

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 71 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-60

DTC
Description of
malfunction
Corrective action
SAE
VAG


P1477 17885 EVAP Emission Contr.
LDP Circ
Malfunction
2)
Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP
system servicing, Checking Leak Detection Pump (LDP)
-V144
- Check Leak Detection Pump (LDP)
P1478 17886 EVAP Emission Contr.
LDP Circ
Clamped Tube
Detected
2) Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP
system servicing, Diagram of EVAP system
- Check hoses (pressure/vacuum) to LDP.
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 72 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
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01-61

DTC
Description of malfunction
Corrective action
SAE
VAG


P1500 17908 Fuel Pump Relay Circ.
Electrical Malfunction
2) - Check Fuel Pump (FP) relay Page 24
-33
P1501 17909 Fuel Pump Relay Circ.
Short to ground
2)
P1502 17910 Fuel Pump Relay 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 73 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-70

DTC
Description of malfunction
Corrective action
SAE
VAG


P1624 18032 MIL Request Sign. active Exhaust relevant malfunction from Transmission Control Module (TCM),
MIL is switched on by TCM
Repair Manual, Automatic Transmission, Repair Group 01, Perform
On Board Diagnostic - Check DTC Memory of TCM
P1626 18034
Data-Bus Powertrain
2)
Missing message from fuel
injection pump - Check CAN-Bus Page 24
-201
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 .
Note for malfunction P1624:

MIL stands for Malfunction Indicator Light. Once the Engine Control Module (ECM) recognizes a malfunction that
decreases the exhaust emissions it switches the MIL on.
The MIL is switched on only by the Engine Control Module (ECM), since the ECM has the only connection to the MIL..
Malfunction that decrease the exhaust emissions can also be recognized by the Transmission Control Module (TCM),
These malfunction are also indicated by the MIL.
Pa
ge 84 of 166 Motronic s
ystem, On Board Dia
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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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01-82

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
ge 100 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1