AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual A4 1996 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1108/w960_1108-0.png AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual

Page 1 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-1
 
     
A/C system, On Board 
Diagnostic (OBD) 
     
Function  
      The A/C control head -E87- receives input 
information from various electrical and electronic 
components (sensors).

Page 2 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-2
      
Notes:  
     
This Repair Manual describes On Board 
Diagnostic (OBD) with VAG1551 Scan Tool 
(ST). OBD procedures can also be performed 
with VAG1552 Scan Tool (ST) (VAG1552 Scan 
Tool i

Page 3 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual      
Before replacing a suspected malfunctioning 
component, check all related wiring, 
connections, harness connectors and Ground 
(GND) connections according to the appropriate 
wiring diagram.

Page 4 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-3
      
Notes:  
     
A/C system component locations: engine 
compartment  page 87
-96
 . 
     
A/C system component locations: passenger 
compartment  page 87
-106
 . 
     
If a the display of

Page 5 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-4
      
Heating and A/C system changes, 1997 
 
     
On Board Diagnostic changes  
     
New A/C control head -E87- with specific 
coding for m.y. 1997, 4-cyl. and 6-cyl. engines. 
     
Notes:

Page 6 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-5
      
Notes:  
     
For m.y. 1997, changes that affect monitoring of 
the A/C system by A/C control head -E87- were 
made. 
     Monitored components, locations   pages 87
-
101
 and   Page 87

Page 7 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual temperature sensor are used as instantaneous 
outside and engine temperature inputs for A/C 
system control. If "standing time" is shorter than 
4 hours, the actual measured values of the 
outside tem

Page 8 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-6
       The following components previously monitored 
by OBD and triggered by A/C control head -E87- 
are deleted:  
     
Refrigerant low pressure switch -F73-.
     Refrigerant high pressure sw

Page 9 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual      
The fresh air blower and control module.
      Following components that provide input signals 
to the A/C control head -E87- are revised:  
     Instrument cluster
Pa
ge 9 of 91 A/C s
ystem, On

Page 10 of 91

AUDI A4 1996 B5 / 1.G AC System On Board Diagnostic Workshop Manual 01-7
      
A/C system changes  
     
Revised heating/air conditioner assembly with 
flap motors   page 87
-174
 . 
     
The air flow flap motor now activates the fresh 
air/recirculating air flap a
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