ground AUDI A4 1996 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1996, Model line: A4, Model: AUDI A4 1996 B5 / 1.GPages: 37, PDF Size: 0.14 MB
Page 6 of 37
24-183
- Take vehicle for a test drive and check whether
vehicle speed appears in display field 3.
- If vehicle speed does not appear, raise the
vehicle (preferably using a lift) until front left
wheel is clear of the ground.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Connect VAG1598/31 test box to wiring harness for engine control
module. Do not connect to the engine control module itself Page 24
-
20
.
- Connect diode test lamp between socket 3 (B+) and socket 54 (vehicle
speed signal).
- Switch ignition on and turn front left wheel by hand.
The diode test lamp should flash (very brief flashes).
- If diode test lamp does not flash, check for open circuit or short to B+
or Ground (GND) in wiring between instrument panel and terminal 54
on engine control module connector.
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Page 7 of 37
24-184
Fuel tank level signal, checking
Note:
The Engine Control Module (ECM) receives the
fuel tank level signal from the instrument
cluster.
The processed signal enters on terminal 30 the
Engine Control Module (ECM) and is used to
determine certain malfunctions (e.g.: misfire)
- Connect VAG1598/31 test box to wiring harness
for engine control module. Do not connect to the
engine control module itself Page 24
-20
.
- Check wiring from test box socket 30 to
instrument cluster according to wiring diagram
for an open circuit and short circuit to B+/Ground
(GND).
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Page 12 of 37
24-189
If specifications are not met:
Check voltage supply
- Connect VAG1527 B between following sockets
on harness connector:
Harness connector
terminal
Measure
against
1 Ground (GND)
The LED must come on
Harness connector
terminal
Measure
against
3 Ground (GND)
- Switch ignition on.
The LED must come on
If LED does not come on:
- Check wiring connection from terminal 1 or 3 of
connector for open circuit (fuse) or short circuit
to Ground (GND).
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Page 13 of 37
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- If necessary eliminate open circuit or short
circuit to Ground (GND)
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Page 14 of 37
24-190
If LED comes on:
Check activation
- Connect VAG1598/31 test box to wiring harness
for engine control module. Do not connect to the
engine control module itself Page 24
-20
.
Test the following wiring connections for open
circuits and short to B+ or Ground (GND):
Harness
connector
terminal
VAG1598/31 test box,
socket
2 56
4 55
- Repair any open/short circuit as necessary.
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Page 20 of 37
24-194
If specification is obtained:
Check voltage supply
- Connect VAG1527 B between following sockets
on harness connector:
Harness connector
terminal
Measure
against
2 Ground (GND)
- Switch ignition on.
The LED must come on
If LED does not come on:
- Check wire connection from terminal 2 of
connector for open circuit (fuse) or short circuit
to Ground (GND).
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- If necessary eliminate open circuit or short
circuit to Ground (GND)
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Page 21 of 37
24-195
If LED comes on:
Check activation
- Connect VAG1598/31 test box to wiring harness
for engine control module. Do not connect to the
engine control module itself Page 24
-20
.
Test the following wiring connections for open
circuits and short to B+ or Ground (GND):
Harness
connector
terminal
VAG1598/31 test box,
socket
1 39
- Repair any open/short circuit as necessary.
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Page 23 of 37
24-197
Test the following wiring connections for open
circuit and/or short to B+ or Ground (GND) and
open circuit.
VAG1598/31 test
box, socket
Airbag control module,
contact
67 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations
Resistance in wiring: max. 1.5 ohm
Eliminate open circuit or short circuit.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations If no malfunctions are found in wiring: Check
DTC memory of airbag control module.
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Page 36 of 37
24-210
If the cause of the malfunction "Data Bus Powertrain Malfunction"
cannot be found in the data bus wires, check whether one of the
control modules is causing the malfunction.
At this stage all the control modules which communicate via the CAN data
bus are disconnected. The ignition is switched off. - Check bus wires for short to B+ and short to Ground (GND).
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