engine coolant AUDI A4 1997 B5 / 1.G ATW Engine Ignition System Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A4, Model: AUDI A4 1997 B5 / 1.GPages: 59, PDF Size: 0.53 MB
Page 24 of 59

28-23
 
  
Display fields  
  
1   2   3   4  
Display group 004: Intake Air Temperature (IAT), engine at idle  
Display   xxxx/min   xx.x volts  
xxx.x C  
xxx.x C  
Indicated  Engine speed 
(RPM)  Battery 
voltage  Coolant 
temperature  Intake Air Temperature (IAT)  
Functional 
range          
-48.0 to 143.0  C  
Specified value   xxxx/min   12.0 to 15.0 V  
80.0 to 110.0 C  
From ambient temperature up to 110
C
1)  
1) If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor and sensor wires for 
contact resistances and open circuit.  
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Page 28 of 59

28-27
       Component location   Overview of component 
locations  Page 24
-5   
     
Note:  
     The engine speed (RPM) sensor detects RPM 
and reference marks. The engine cannot be 
started without a signal from the engine speed 
(RPM) sensor -G28-. If the engine speed (RPM) 
sensor -G28- signal fails while the engine is 
running, the engine will stop immediately. 
     
Test sequence  
     
-  Before performing test, check sensor for proper 
installation and proper fitting. 
    
Note:  
Coolant reservoir screws must be removed and coolant reservoir must be 
placed to side in order to access the harness connector. The coolant 
hoses can remain connected.  -  Disconnect harness connector for engine speed (RPM) sensor -G28- 
(item no. 3) in engine compartment. 
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Page 31 of 59

28-30
 
  
Engine Coolant Temperature (ECT) sensor 
-G62-, checking
 
Special tools and equipment  
 
VAG1526A
 VAG1594A
 VAG1598/31
 VAS5051 with VAG5051/1
- or 
 VAG1551 with VAG1551/3A
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Page 33 of 59

28-32
 
  
Display fields  
  
1   2   3   4  
Display group 004: Coolant temperature, engine at idle  
Display   xxxx/min   xx.x volts  
xxx.x C  
xxx.x C  
Indicated  Engine speed 
(RPM)  Battery 
voltage  Coolant temperature   Intake Air Temperature (IAT)  
Functional 
range       
-48.0 to 143.0 C  
  
Specified value   xxxx/min   12.0 to 15.0 
V  Temperature value must rise 
evenly  From ambient temperature up to 
110 C  
      If display field 3 does not have a realistic 
indication:  
     
-  Disconnect connector at coolant temperature 
sensor. 
     
Coolant temperature sensor with square 
connector: 
    
-  Connect multimeter between terminal 1 and 3 of sensor for resistance 
measurement. 
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Page 35 of 59

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       If specified value is obtained:  
     
-  Connect VAG1598/31 test box at wiring harness 
to Engine Control Module (ECM), do not connect 
ECM  Page 24
-19
 . 
     
Coolant temperature sensor with square 
connector: 
    
Coolant temperature sensor with oval connector:  -  Check following wire connections for open circuit and short circuit to 
Ground (GND) and B+: Harness connector  
Terminal  
VAG1598/31 test box  
Socket  
1 (signal)   93  
3   108  
    
-  Check following wire connections for open circuit and short circuit to 
Ground (GND) and B+: Harness connector  
Terminal  
VAG1598/31 test box  
Socket  
3   108  
4 (signal)   93  
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