display AUDI A4 1998 B5 / 1.G AWM Engine Diagnostic Trouble Code Memory Checking Workshop Manual

01-12


Diagnostic Trouble Code
(DTC) memory, checking and
erasing

Check DTC Memory (function 02)


- Connect VAS5051 tester Page 01-7 and
select vehicle system "01 - Engine electronics".
Engine should run at idle for this.

Note:
If engine doesn't start, crank engine using starter
for at least 5 seconds. Do not switch ignition off
afterward under any circumstance.

Display on VAS5051:
- In selection -1-, click on the diagnostic function "02 - Check DTC
memory".
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01-13


Display on VAS5051:
A - If malfunctions were recognized: 1 - DTC memory content:

0 malfunctions recognized
or

X malfunctions recognized
2 - Malfunction

DTC

malfunction location
malfunction type
- Print out screen content or On Board Diagnostic (OBD) protocol.
-
End function "02 - check DTC memory" by pressing button.

Display on VAS5051:
B - If no malfunctions were recognized: - Repair malfunction(s) according to DTC table Page 01
-17
.
- In selection, click on diagnostic function "02 - Check DTC memory"
again and erase DTC memory Page 01
-14

- In selection, click on diagnostic function "06 - end output" Page 01
-
16
.
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01-14

Erase DTC Memory (function 05)


Important note:

If there are no DTCs in DTC memory, DTC
memory should not be unnecessarily erased or
else readiness code will be lost.
If DTC memory was erased, readiness code
must be re-generated Page 01
-84
.

If DTC memory cannot be erased, check DTC
memory again and repair malfunction.

Requirements
DTC memory checked Page 01
-12
.

All malfunctions repaired.
After successful DTC memory check:

Display on VAS5051:
- In selection -1-, click on the diagnostic function "05 - Check DTC
memory".
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01-15


Display on VAS5051:
Note:
If indication -1- appears in display field: "DTC memory has not yet been
checked", the work sequence was not adhered to correctly. DTC memory
can only be erased if DTC memory was checked before.
Note:
This causes DTCs to be erased that were stored during repair of
malfunction, e.g. because harness connectors were disconnected. 1 - no indication (before erasing)
or

DTC memory erased
2 - Note: Perform the function?
Note: Data is being erased !
- Press on "OK" button in display -2-.
-
End function "05 - erase DTC memory" by pressing on button.- Check DTC memory again after repair work:
- If DTC memory was erased, readiness code must be re-generated
Page 01
-84
.
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01-16

End Output (function 06)


Display on VAS5051:
- Select diagnostic function "06 - end output" in selection -1-.

Display on VAS5051:
- Switch off ignition and disconnect diagnostic connector after this
indication is displayed.
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01-17
Diagnostic Trouble Code (DTC) table

Notes:

When malfunctions occur in monitored sensors or components, Diagnostic Trouble Codes (DTCs) are stored in DTC
memory with a description of the malfunction type.
"E-Gas" relevant malfunctions are also indicated in the instrument cluster by the warning lamp for Electronic Power
Control ("EPC warning lamp"); Notes for E-Gas system Page 24
-120
.
Malfunctions that worsen emissions are indicated by an exhaust warning lamp (MIL) in the instrument cluster. Notes for
Malfunction Indicator Lamp (MIL) Page 01
-3 .
The DTC table is organized by the 5 digit code at left.
If a stored DTC does not recur within the next 40 warm-up cycles, the DTC will be erased automatically.
Malfunctions that occur sporadically (temporarily occurring malfunctions) are identified with "sporadic" on display. The
word sporadic means "appearing or occurring at irregular intervals, occasional".
Do not immediately replace components that the VAS5051 suggests are faulty, instead: Check wire connections and
harness connectors to these components according to wiring diagram. Also check Ground (GND) connections according
to wiring diagram. This is particularly valid when malfunctions are displayed as "sporadic".
If the connector is disconnected from the ECM or the battery is disconnected, all adaptation values in the control module
are erased. DTC memory content will remain intact however. If the engine is started after this, a rough, uneven idle can
result. In this case, engine must be allowed to run at idle for a few minutes until adaptation procedure has been
completed.
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01-41

DTC
DTC text
Corrective action
SAE
VAG


P1432 17840 Secondary Air Injection (AIR)
solenoid valve -N112-
Open circuit Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine
Code(s): AWM, Checking Secondary Air Injection (AIR) system

P1433 17841 Secondary Air Injection (AIR)
pump relay -J299-
Open circuit
P1434 17842 Secondary Air Injection (AIR)
pump relay -J299-
Short circuit to B+
P1435 17843 Secondary Air Injection (AIR)
pump relay -J299-
Short circuit to Ground (GND)
P1479 17887 Brake vacuum system
Mechanical malfunction - Perform a short trip in Engine Control Module (ECM) (basic setting;
display group 8 with ignition on and selector lever in "P" or "N")
- Check hose setup to pump or from the pump to brake booster
- Perform output Diagnostic Test Mode (DTM) in Engine Control Module
(ECM) to check whether the vacuum pump runs or is activated
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