light AUDI A4 1999 B5 / 1.G ATW Engine Electronic Power Control Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1999, Model line: A4, Model: AUDI A4 1999 B5 / 1.GPages: 51, PDF Size: 0.3 MB
Page 4 of 51
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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Page 5 of 51
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Electronic Power Control (EPC) warning
lamp -K132-, checking
Note:
The fault light for power accelerator activation -
K132- is also called the EPC warning lamp.
Special tools and equipment
VAG1594A
VAG1598/31
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Page 6 of 51
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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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Page 9 of 51
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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,
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Page 38 of 51
24-143
Brake light switch and brake pedal switch,
checking
Special tools and equipment
VAG1526A
VAG1527B
VAG1594A
VAG1598/31
VAS5051 with VAG5051/1
- or
VAG1551 with VAG1551/3A
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Page 39 of 51
24-144
Note:
For safety reasons, the instruction from the
accelerator pedal sensor (potentiometer) to the
ECM to open the throttle valve is suppressed
when brake is being operated. This requires the
brake light switch signal and also the brake pedal
switch signal in the control module. If brake pedal
is operated with accelerator pedal constantly
depressed, engine is immediately regulated
down to idle speed. A faulty switch can lead to
undesired regulation.
Test sequence
- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
. Ignition
must remain switched on.
Rapid data transfer
HELP
Select function XX
When indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read measurin
g value block
Q
Enter displa
y group number XXX
When indicated on display
- Press buttons -0-, -6- and -6- to select "display group number 066" and
press -Q- button to confirm input.
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Page 40 of 51
24-145
Read Measuring Value Block 66
1
2
3
4
Indicated on display
- Check brake light/brake pedal switch in display field 2.
Display fields
1 2 3 4
Display group 066: Signals to Engine Control Module (ECM)
Display xxx km/h
XXXX xxx km/h XXXX
Indicated ACTUAL speed
Switch positions SPECIFIED speed Switch positions
Functional range
XX00
XX11
Specified value
XX00
(with brake pedal not operated)
XX11
(with brake pedal operated)
Note
Value:X = no significance.
Switch points slightly offset
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Page 41 of 51
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If indications do not resemble description:
Check switch
- Remove driver-side storage compartment.
Repair Manual, Body Interior, Repair Group
68; Instrument panel; Driver
-side storage
compartment, removing
- Disconnect harness connector at brake light
switch and brake pedal switch.
If specified values are not obtained: - Connect multimeter between terminal 1 and 2 for resistance
measurement.
Specification: (no continuity)
- Depress accelerator pedal.
Specification: approx. 0
- Connect multimeter between terminal 3 and 4 for resistance
measurement.
Specification: approx. 0
- Depress accelerator pedal.
Specification: (no continuity)
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Page 42 of 51
- Replace brake light switch / brake pedal switch.
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Page 43 of 51
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If specified values are obtained:
- Check voltage supply
Checking voltage supply
If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Connect VAG1527B voltage tester as follows:Harness connector
Terminal
Measure to
1 Chassis Ground (GND)
LED must light up.
Harness connector
Terminal
Measure to
3 Chassis Ground (GND)
- Switch ignition on.
LED must light up.
- Check wire connection from terminal 1 or 3 of connector for open
circuit and short circuit to Ground (GND):
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