relay AUDI TT 1997 8N / 1.G AEB ATW Engines Secondary Air System Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: TT, Model: AUDI TT 1997 8N / 1.GPages: 16, PDF Size: 0.21 MB
Page 2 of 16

26-30
 
  
Function:  
 
In the cold start phase, the ECM -2- activates 
the secondary air pump -12- via the relay for 
secondary air pump -1-. Air is supplied to the 
combination valve for Secondary Air Injection 
(AIR) -10-. 
 The Secondary Air Injection (AIR) valve -3- is 
activated in parallel, which allows the vacuum to 
reach the combination valve for Secondary Air 
Injection (AIR) -10- and the vacuum diaphragm 
for charge air pressure regulation -7-. The 
combination valve for Secondary Air Injection 
(AIR) thereby opens the path for secondary air 
to the exhaust channels of the cylinder head. 
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Page 3 of 16

26-31
 
  
 
To prevent unnecessary heating, the secondary 
air is diverted past the turbocharger -7-. For 
this, the charge air pressureregulation pressure 
unit opens the charge air pressure valve. The 
pressure unit, designed as a double reservoir, 
has a vacuum connection for this on the intake 
side. 
1 - 
Secondary Air Injection (AIR) pump relay -
J299- 
2 - 
Motronic Engine Control Module (ECM) -
J220- 
3 - 
Secondary Air Injection (AIR) solenoid 
valve -N112- 
4 - 
Intake manifold 
5 - 
Check valve 
Installation position (light/dark side): Arrow 
points in direction of flow, as shown 
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Page 8 of 16

26-36
 
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   
 Repair Manual, Fuel Supply System, Repair Group 20
   
Checking activation  
Check wire connection from terminal 1 of connector via fuse S234 (in 
fuse holder, socket 34) to Fuel Pump (FP) relay for open circuit: Check Fuel Pump (FP) relay 
    
-  Connect VAG1527B voltage tester between terminals 1 and 2 using 
test leads from VAG1594A. 
-  Connect VAG1551 scan tool.
-  Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air 
Injection (AIR) solenoid valve -N112-. 
Output Diagnostic Test Mode Secondary Air Inj. Solenoid Valve -N112
    
Indicated on display  
 
LED must blink.
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Page 10 of 16

26-38
 
  
Secondary Air Injection (AIR) pump relay -
J299-, checking activation
 
Special tools and equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
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Page 11 of 16

26-39
       Installation location:  
     
       Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel 
Injection & Ignition, Repair Group 24        
-  Initiate output Diagnostic Test Mode (DTM) and 
activate Secondary Air Injection (AIR) pump 
relay -J299-.  
    
A - If relay does not trigger:  
B - If relay triggers, but Secondary Air Injection (AIR) pump does not run:   
The Secondary Air Injection (AIR) pump relay (in 3-socket relay 
carrier in the E-box, at left in plenum chamber, position 2) must 
trigger and the Secondary Air Injection (AIR) pump motor -V101- 
must run in intervals 
-  Check voltage supply of Secondary Air Injection (AIR) relay   Page 
26
-40
 . 
-  Checking activation of Secondary Air Injection (AIR) relay   Page 26
-
42
 . 
-  Check voltage supply for Secondary Air Injection (AIR) pump   Page 
26
-43
 . 
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Page 12 of 16

26-40
      
Checking voltage supply of Secondary Air 
Injection (AIR) pump relay  
     
-  Remove Secondary Air Injection (AIR) pump 
relay. 
    
If specified value is not obtained:  -  Connect multimeter for voltage measurement as follows.3-socket relay carrier in E-box, plenum 
chamber, position 2  
terminal  
Measure to  
  
8   Engine Ground 
(GND)  
 
Specified value: approx. battery voltage
-  Perform the following tests marked with dots:
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   Check fuse S130 (40 A) in 3-socket relay carrier in E-Box, plenum 
chamber, position 7. Check wire connection from Battery (B+) (terminal 30) to Secondary 
Air Injection (AIR) pump relay -J299- (in 3-socket relay carrier in E-
Box, plenum chamber, position 2) for open circuit. 
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Page 13 of 16

26-41
 
    
If specified value is not obtained:  -  Connect multimeter for voltage measurement as follows.3-socket relay carrier in E-box, plenum 
chamber, position 2  
terminal  
Measure to  
  
4   Engine Ground 
(GND)  
-  Operate starter briefly. 
 
Specified value: approx. battery voltage
-  Perform the following tests marked with dots:
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   Check fuse S234 (in fuse holder, position 34). Check wire connection from Secondary Air Injection (AIR) pump relay 
-J299- (in 3-socket relay carrier in E-box, plenum chamber) via fuse 
S234 (in fuse holder, position 34) to Fuel Pump (FP) relay for open 
circuit: 
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Page 14 of 16

26-42
      
Checking activation of the Secondary Air 
Injection (AIR) pump relay  
     
-  Switch ignition off.
     
-  Remove Secondary Air Injection (AIR) pump 
relay. 
    
If LED does not blink:  -  Connect VAG1527B voltage tester as follows:3-socket relay carrier in E-box, plenum 
chamber, position 2  
terminal  
Measure to  
  
6   Engine Ground 
(GND)  
-  Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air 
Injection (AIR) pump relay -J299-. 
 
LED must blink.
-  Switch ignition off.
-  Connect VAG1598/31 test box at wiring harness to ECM, do not 
connect ECM. 
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Page 15 of 16

26-43
 
    
If no malfunctions are detected:  
Checking voltage supply of the Secondary Air Injection (AIR) pump 
motor   -  Check the following wire connection for open circuit and short circuit to 
Ground (GND) and B+: 3-socket relay carrier in E-box, plenum 
chamber, position 2  
terminal  
VAG1598/31 test 
box  
socket  
6   46  
-  Repair open circuit or short circuit if necessary.
-  Replace Secondary Air Injection (AIR) pump relay -J299-.
-  Remove harness connector for Secondary Air Injection (AIR) pump 
motor -V101-. 
-  Connect VAG1527B voltage tester between terminals 1 and 2.
-  Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air 
Injection (AIR) pump relay -J299-   Page 26
-42
 .  
 
LED must light.
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Page 16 of 16

26-44
       If LED does not light:  
     
-  Perform the following tests marked with dots:
     
Check wire connection from harness 
connector at Secondary Air Injection (AIR) 
pump motor -V101- to Secondary Air 
Injection (AIR) pump relay -J299- (in 3-
socket relay carrier in E-Box, plenum 
chamber, position 2) for open circuit. 
     
       Electrical Wiring Diagrams, Troubleshooting & 
Component Locations   
     
Check wire connection from harness 
connector at Secondary Air Injection (AIR) 
pump motor -V101- to Ground (GND) 
connection 1 in engine compartment wiring 
harness for open circuit: 
     
       Electrical Wiring Diagrams, Troubleshooting & 
Component Locations   
      If no malfunctions are detected:  
     
-  Replace Secondary Air Injection (AIR) pump 
motor -V101-. 
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