AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual https://www.carmanualsonline.info/img/6/1041/w960_1041-0.png AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual

Page 1 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual 24-164
 
     
Auxiliary signals, checking 
     
Signal from A/C compressor, checking
 
     
Required special tools and test equipment  
     
VAG1551 or VAG1552 Scan Tool (ST) with 
VAG1551/3 adapt

Page 2 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual Code (DTC) memory   page 01
-16
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Page 3 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual 24-165
      
Checking  
     
-  Connect VAG1551 or VAG1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with engine 
running at idle)   page 01
-8 . 
Rap

Page 4 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual 24-166
      
-  Compare display with specified values for A/C 
(in display field 4). 
  
Display fields  
  
1   2   3   4  
Display group 50: Signals to Engine Control Module (ECM)  
Display   xxxx

Page 5 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual      
Notes:  
     
The A/C compressor is switched off during 
acceleration when the car is stationary or at 
slow speed. 
     At wide open throttle the A/C compressor is 
switched off by the Transm

Page 6 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual 24-167
      
Continuation  
      If the displayed values are NOT OK:  
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 . 
     
-  Check wiring for open circuit, short c

Page 7 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual      
- Check readiness code   page 01
-70
 . If 
Diagnostic Trouble Code (DTC) memory has 
been erased, or ECM was disconnected, 
generate new readiness code   page 01
-73
 . 
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ge 7 of 22 Auxiliar

Page 8 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual 24-168
      
Vehicle speed signal, checking
 
     
Required special tools and test equipment  
     
VAG1551 or VAG1552 Scan Tool (ST) with 
VAG1551/3 adapter cable 
     Multimeter US1119 (Fluke 83

Page 9 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual      
Read safety precautions for test driving vehicles 
while using test equipment   page 24
-9 . 
     
The speed signal is generated by the vehicle 
speed sensor (at the transmission), and 
process

Page 10 of 22

AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual 24-169
      
Test procedure  
     
-  Connect VAG1551 or VAG1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with engine 
running at idle)   page 01
-8
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