AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual https://www.carmanualsonline.info/img/6/1046/w960_1046-0.png AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual

Page 1 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-1
 
     
On Board Diagnostic (OBD) 
     
Function
 
      The Multiport Fuel Injection (MFI) system is 
equipped with an Engine Control Module (ECM) -
J220- with On Board Diagnostic (OBD) 
capabi

Page 2 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual VAG1598/22 test box), or the battery has been 
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-73
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Page 3 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-2
      
Malfunction Indicator Lamp (MIL) 
function, checking
 
      If a malfunction is recognized by the Engine 
Control Module (ECM) or the Transmission 
Control Module (TCM), this is indicated

Page 4 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-3
      
Checking function  
     
-  Switch ignition on.
     
   MIL must light up.
     
-  If MIL does not light when ignition is switched 
on, check wiring to MIL as follows: Cause:  
MIL is n

Page 5 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual       If wiring is OK:  
Malfunction:  
  
Motronic ECM -J220- is faulty; replace (   page 01
-68
 ). Check and erase 
Diagnostic Trouble Code (DTC) memory and generate new readiness code   
page 01
-

Page 6 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-4
       If MIL lights up when ignition is switched on, 
continue checking as follows:  
     
-  Start engine and let run at idle.
     
   MIL must go out after a few seconds.
      If MIL does n

Page 7 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual Malfunction:  
  
Motronic ECM -J220- is faulty; replace (   page 01
-68
 ). Check and erase Diagnostic 
Trouble Code (DTC) memory and generate new readiness code   page 01
-73
 .  
Pa
ge 7 of 97 On B

Page 8 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-5
 On Board Diagnostic (OBD) technical data
 
Memory  
 
Temporary memory and permanent memory. If the engine control module is disconnected from the Battery Positive 
Voltage (B+) supply, the read

Page 9 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-6
 Functions under "Engine Electronics" address word 01:  Function 01: Check Control Module 
Version  Ignition switched on -or- Engine running at idle  
Function 02: Check DTC Memory   Engine runni

Page 10 of 97

AUDI A4 1998 B5 / 1.G AHA Engine On Board Diagnostic Workshop Manual 01-7
 Modes under address word 33:  Mode 1: Transfer diagnostic data   Ignition switched on -or- Engine running at idle  
Mode 2: Transfer operating conditions   Ignition switched on -or- Engine runni
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