check engine AUDI A6 1997 C5 / 2.G ATW Engine Motronic Fuel Injection Syst
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A6, Model: AUDI A6 1997 C5 / 2.GPages: 81, PDF Size: 1.03 MB
Page 3 of 81

24-2
      
It is possible that the control module will 
recognize a malfunction and store a DTC during 
some tests. After completing all tests and 
repairs, DTC memory should therefore be 
checked and erased if necessary. Readiness 
code must be generated after DTC memory is 
erased  Page 01
-73
 . 
     
Always switch ignition off before cleaning 
engine. 
     The battery should only be disconnected and 
reconnected when the ignition is turned off, 
since otherwise the Engine Control Module 
(ECM) can be damaged. 
     
WARNING! 
     
Fuel system is under pressure! Before 
opening system, place rags around the 
connection point. Then release pressure by 
carefully loosening connection. 
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Page 7 of 81

24-6
 
  
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine 
Mechanical, Engine Code(s): AEB, ATW, Repair Group 26; Secondary Air Injection (AIR) system, checking
    3 - 
Oxygen Sensor (O2S) behind Three Way 
Catalytic Converter (TWC) -G130-, 55 Nm Check Oxygen Sensor (O2S) and oxygen 
sensor control behind Three Way Catalytic 
Converter (TWC)   Page 24
-87
 
Check oxygen sensor heater for Oxygen 
Sensor (O2S) behind Three Way Catalytic 
Converter (TWC)   Page 24
-99
 
Removing and installing   Page 24
-105
4 - 
Combination valve for secondary air 
injection (AIR) 
Checking, removing and installing:
5 - 
Engine Coolant Temperature (ECT) sensor 
-G62- 
Checking  Page 28
-30
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Page 8 of 81

24-7
 
  
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine 
Mechanical, Engine Code(s): AEB, ATW, Repair Group 26; Secondary Air Injection (AIR) system, checking
    6 - 
Fuel pressure regulator Checking  Page 24
-33
7 - 
Engine Speed (RPM) sensor -G28- 
Checking  Page 28
-26
8 - 
Secondary Air Injection (AIR) solenoid 
valve-N112- 
Installation position   Page 24
-14
 , Fig.   
4
 Checking:Green harness connector
9 - 
Bracket for harness connectors Component location   Page 24
-13
 , Fig. 
 1
 
Accessible with coolant expansion tank 
unbolted and swung to the side. 
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Page 10 of 81

24-9
 
  
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine 
Mechanical, Engine Code(s): AEB, ATW, Repair Group 26; Secondary Air Injection (AIR) system, checking
    13 - 
E-box, plenum chamber Installation locations   Page 24
-15
 , Fig. 
 6
 
Installation location for motronic Engine 
Control Module (ECM) -J220- with 
integrated Barometric pressure (BARO) 
sensor -F96- Check voltage supply of Engine Control 
Module (ECM)   Page 28
-36
 
Procedure to follow after open circuit in 
voltage supply   Page 24
-22
 
Replacing Engine Control Module (ECM) 
 Page 24
-23
 
Installation location of Secondary Air 
Injection (AIR) pump relay -J299- Check Secondary Air Injection (AIR) pump 
relay -J299-: 
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Page 11 of 81

24-10
 
  
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine 
Mechanical, Engine Code(s): AEB, ATW, Repair Group 21, Charge air system with turbocharger, checking
     
Installation location of motronic Engine Control 
Module (ECM) power supply relay -J271- 
 Check motronic Engine Control Module (ECM) 
power supply relay -J271-   Page 28
-13
 
 Installation location of fuse S130 for Secondary 
Air Injection (AIR) pump 
14 - 
Clutch vacuum vent valve switch -F36- 
Component location   Page 24
-14
 , Fig. 
 3
 
15 - 
Charge air pressure sensor -G31- 
Installation position   Page 24
-16
 , Fig.   
7
 Checking:
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Page 13 of 81

24-12
 
  
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine 
Mechanical, Engine Code(s): AEB, ATW, Repair Group 21, Charge air system with turbocharger, checking
   
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine 
Mechanical, Engine Code(s): AEB, ATW, Repair Group 26; Secondary Air Injection (AIR) system, checking
    22 - 
Fuel injectors -N30- through -N33- Checking  Page 24
-38
Removing and installing   Page 24
-46
23 - 
Ignition coils -N-, -N128-, -N158-, -N163- 
Checking  Page 28
-4
24 - 
Wastegate bypass regulator valve -N75- 
Checking:
25 - 
Mass Air Flow (MAF) sensor -G70- 
Checking  Page 24
-60
26 - 
Secondary Air Injection (AIR) pump 
motor-V101- 
Checking:
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Page 22 of 81

24-21
      
Note:  
     Important note: 
     After re-connecting the Engine Control Module 
(ECM), the following work steps must be 
performed: 
     - Perform adaptation of the Throttle Valve Control 
Module -J338-   Page 24
-121
 . 
     - For vehicles with automatic transmission, the 
kick down function must be adapted   Page 24
-
139
 . 
     - Check DTC memory and erase it if necessary 
 Page 01
-16
 . 
     - If DTC memory was erased, readiness code 
must be re-generated   Page 01
-73
 . 
     
Note:  
     During the first adaptation phase, it is possible 
that idle will be rough and vehicle may shake 
lightly in drive mode. 
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Page 27 of 81

24-26
      
Installing  
      Installation is reverse of removal, noting the 
following:  
     
Note:  
     Important note: 
     After installing new Engine Control Module 
(ECM), the following work steps must be 
performed: 
     - Check DTC memory and erase it if necessary 
 Page 01
-16
 . 
     - Perform adaptation of the Throttle Valve Control 
Module -J338-   Page 24
-121
 . 
     - Observe notes for coding new Engine Control 
Module (ECM)   Page 01
-62
 . 
     - For vehicles with cruise control (discernable at 
steering column), switch this free in ECM: 
     
       Repair Manual, Electrical Equipment On 
Board Diagnostic (OBD), Repair Group 01; OBD for cruise control system
   
     - For vehicles with automatic transmission, the 
kick down function must be adapted   Page 24
-
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Page 31 of 81

24-29
      
Note:  
     
Idle speed cannot be adjusted.
     Idle speed is checked during basic setting of 
the engine. 
     During basic setting, the Evaporative Emission 
(EVAP) canister purge regulator valve (EVAP 
valve -N80-) is closed and the A/C compressor 
is switched off 
     
Test sequence  
     
-  Check DTC memory   Page 01
-16
. There must 
not be any DTCs stored, repair malfunctions if 
necessary, erase DTC memory, switch engine 
off and start again, road test vehicle and check 
DTC memory again as a control measure. 
     
-  Let engine continue to run at idle.
     
WARNING! 
     
The electric fan for the radiator must not be 
running. Rapid data transfer 
HELP
Select function XX
    
When indicated on display  
- 
Press buttons -0- and -4- to select "Initiate basic setting" and press -Q- 
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Page 33 of 81

24-30
 
Basic Settin
g 
Q
Enter display group number XXX
    
When indicated on display  
-  Press buttons -0-, -5- and -6- to select "display group number 056" and 
press -Q- button to confirm input. 
System in basic setting 56  
1 
2 
3 
4 
    
When indicated on display  
-  Check whether the engine speed in display field 1 (actual engine speed) is 
within tolerated range. 
  
Display fields  
  
1   2   3   4  
Display group 056: Idle stabilization at operating temperature  
Display  
xxx /min  
xxx /min   x.x %   X X X X X  
Indicated  
Engine speed (actual)  
Engine speed 
(specified)  Idle control  
Torque 
change  Operating conditions  
Specified 
value  FWD: 740 to 860 RPM  
AWD: 800 to 920 RPM  FWD: 800 RPM  
AWD: 860 RPM  x.x %   0 0 0 0 0  
Note  
If specified value is not obtained 
 Page 24
-32
   
      Significance of numbers   
Page 24
-32
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