1999 AUDI A4 engine

01-142
Test No. 5 (A/C pressure switch -F129-, "A/C compressor intervention" signal, engine temperature signal from
instrument cluster and Interior Temperature Sensor Fan -V42-) Adapter cable VAG1598/11
Measuring range: Resistance measurement (200 )
Test
Step VAG1598 socket
Test of
Test conditions
- additional work Specified Value
Corrective action
5.1 to
5.6 Not for 1997. A/C compressor speed sender -G111-, A/C high pressure switch -F118- and Low pressure switch -
F73- are no longer installed
Adapter cable VAG1598/11
Measuring range: Current measurement (20 A)
Test Step
VAG1598 socket
Test of
Test conditions
- additional work Specified Value
Corrective action
5.7 page 01
-131

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01-143

A/C control head -E87- connected to test box with adapter cable VAG1598/11
LED Voltage tester VAG1527B
Test
Step VAG1598
socket Test of
Test conditions
- additional work Specified
Value Corrective action
5.8 14 + 12 "A/C compressor
intervention"
output.
Engine
running. A/C
compressor
off
- Switch on A/C
compressor - LED lights
up


- LED lights
up slightly
dimmer. - Diagnose and repair open or short circuit in
wiring/connections using wiring diagram.
- Diagnose and eliminate A/C compressor
cut-off condition(s) from Engine Control
Module (ECM) or Transmission Control
Module (TCM)
- Diagnose and repair short circuit to ground
in wiring/connections using wiring diagram.
5.9 Ground
and
51 "Engine
temperature too
high" signal. Engine
running. - LED lights
up. - Diagnose and repair short circuit to ground
in wiring/connections using wiring diagram.
- Diagnose and eliminate A/C compressor
cut-off condition from Instrument cluster
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01-144

A/C control head -E87- connected to test box with adapter cable VAG1598/11
Measuring range: Current measurement (200 mA)
Test
Step VAG1598
socket Test of
Test conditions
- additional work Specified
Value Corrective action
5.10 Ground
and
12
"A/C compressor
intervention"
output.
Engine running. A/C compressor
off

- Switch on A/C
compressor



- Remove multimeter
connector probes
from test box - Less than 5
mA



- Less than
50 mA
- Compressor
does not en-
gage
- Compressor
engages
Repair Manual, Fuel Injection and
Ignition
Repair Manual, Automatic
Transmission - Diagnose and repair short circuit to
positive in wiring/connections using
wiring diagram.
- Replace A/C control head -E87-.



- Diagnose and eliminate A/C
compressor cut-off condition(s) from
Engine Control Module (ECM) or
Transmission Control Module (TCM)
- Diagnose and repair short circuit to
ground in wiring/connections using
wiring diagram.
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01-149

VAG1527 B Voltage Tester

A/C control head -E87- connected at test box (VAG1598/11 and /12 adapter cables)
VAG1598/11 adapter cable connected
Test
step VAG1598A
socket Test of
Test
requirements
- additional
operations Specified value
Corrective action
5.9 5) Ground
+
51 "Engine temperature
too high" signal
Engine
running
LED on
voltage tester
lights - Locate short circuit to Ground
and repair according wiring
diagram
- Eliminate A/C compressor cut-
off conditions in instrument
cluster
5) Only perform this test step for vehicles of m.y. 1997 or later
Notes:
Ignition key coding is transmitted to the A/C control head -E87- from the instrument cluster along with the coolant
temperature and the signal "engine temperature too high" when ignition is switched on for vehicles as of m.y. 1999 (data
message). Key coding can only be processed by A/C control heads -E87- with part number 8D0 820 043 after index "M."
No information can be transmitted if the coolant temperature is too high.
When ignition is switched on, A/C control head -E87- begins with the setting that was valid when the ignition was last
switched off with this key (temperature, air distribution, fresh air blower RPM).
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01-150
List of changes to electrical tests, 1998 VAG1527B voltage tester
VAG1598/11 adapter cable connected
Test
step VAG1598
sockets Test of
Test
conditions
- additional
operations Specified
value Corrective action
1.9 33 +
GND Signal for
"ignition off"
period
Ignition
switched on LED on voltage tester lights
- Repair open circuit or
short circuit according to
wiring diagram.
1.10 33 +
GND Signal for
"ignition off"
period Ignition
switched on
- Start engine.LED in voltage tester lights up
When starting engine, LED briefly
flickers in voltage tester (time signal)
and then lights constantly - Repair open circuit or
short circuit according to
wiring diagram.
- Check instrument cluster.
Note:
Test steps 1.9 and 1.10 apply only for vehicles beginning m.y. 1997 (A/C control head with Part No. 8L0 820 043 up to Part
No. index letter "C").
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