instrument cluster AUDI A4 2000 B5 / 1.G ATW Engine Electronic Power Control Checking Workshop Manual

24-115

Electronic Power Control (EPC) warning
lamp in instrument cluster


Note:
The Electronic Power Control (EPC) warning
lamp -K132- is also called the fault light for power
accelerator activation.
"EPC" is an abbreviation and stands for
Electronic Power Control (E-gas).

Installation location of EPC warning lamp
Engine Control Module (ECM) checks all components that are important
for function of the E-Gas system after ignition is switched on.
The Engine Control Module (ECM) switches on the EPC warning lamp
after ignition is switched on. Shortly after engine is started, the EPC
warning lamp will go out. This requires, first of all, that the Engine Control
Module (ECM) does not detect a malfunction in the E-gas system and,
secondly, that activation of the lamp by the Engine Control Module (ECM)
is OK.
If malfunctions are recognized in the E-Gas system during operation of
the engine, the ECM switches on the EPC warning lamp in instrument
cluster. (These malfunctions are listed in the DTC table). An entry is made
in DTC memory at the same time.
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24-117

Function test of warning lamp

- Switch ignition on.


The EPC warning lamp must light up for
approximately 3 seconds if there are no
malfunctions stored in DTC memory that
relate to the E-gas system

A- Fault light for power accelerator activation
-K132- does not light up

- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.

- Bridge terminals 1 and 48 at test box using wires
from VAG1594A adapter test kit.

- Switch ignition on.


Warning lamp must light up.
If warning lamp does not light up:

- Switch ignition off.

- Remove instrument cluster:
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Repair Manual, Electrical Equipment, Repair
Group 90, Instrument cluster, removing and installing

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24-118

- Check following wire connection for open circuit
and short circuit to B+:

Test box
VAG1598/31
Socket
Instrument cluster

Terminal
48 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations

- Repair open circuit or short circuit if
necessary.
If wire connection is OK:

- Replace Engine Control Module (ECM) Page
24
-23

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24-119

B- Fault light for power accelerator activation
-K132- lights up constantly

- Check DTC memory of Engine Control Module
(ECM) Page 01
-16
.
If no DTCs are stored:

- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.

- Remove instrument cluster:

Repair Manual, Electrical Equipment, Repair
Group 90, Instrument cluster, removing and installing


- Check following wire connection for short circuit
to Ground (GND):

Test box
VAG1598/31
Socket
Instrument cluster

Terminal
48 Electrical Wiring Diagrams,
Pa
ge 9 of 51 Electronic En
gine Power Control
(EPC
) (E-Gas
), checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.4