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Home >> Audi >> 1996 >> A6 Quattro Sedan (4A2) V6-2.8L (AFC) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Testing >> Diagnosis With Scan Tool, Address Word 01 >> Basic Setting >> Display Group Diagnostic Charts >> Display Group 017

Display Group 017

NOTE:
- If in display group 029, display field 1, the value of the EGR system throughput diagnosis is not set to "0" during the regeneration of the "readiness code," and/or a malfunction relating to the exhaust system is stored in the DTC memory display group 017 is used to carry out a selective diagnosis.
- During cold start at idle, -10°C to 30°C (14 to 86°F), and during "Basic Setting" function 04, no exhaust gas recirculation takes place. Since exhaust gas recirculation is switched off automatically during "Basic Setting" function 04, diagnosis of EGR throughput is evaluated only in "Read Measuring Value Block." function 08. If diagnostic conditions are fulfilled, the Engine Control Module (ECM) checks the flow through the EGA system after each start. The diagnostic conditions are only reached during a trip at 80-100 km/h (5-63 mph) in 4th or 5 gear and/or with selector lever in the "0" position, preferably in 4th gear position.
- If the diagnostic conditions are fulfilled, the diagnosis is active, In order to get a diagnostic result, the vehicle must be driven approx. 1-1/2 to 5 minutes under the diagnostic conditions. However, the diagnosis is only considered OK when the EGR temperature (display field 4) is greater than 50°C (122°F) during the reading time (display field 2).

Diagnosis of the EGR flow (exhaust gas recirculation quantity) is active as soon as the following diagnostic conditions are fulfilled:
- Coolant temperature: greater than 80°C (176°F) (display group 001)
- Vehicle speed: constant drive
- Engine speed: 2000-3000 RPM (display group 003)
- Engine load: 30-60%
- Altitude display: less than 48 (display group 001, display field 3)





Notes on display fields 1 and 2:
- In display fields 1 and 2, the timers are displayed. The final value of timer 2 is "48" or "160". The final values "48" and "160" are reading times ("48" = reading time 1; "160" = reading time 2).
- If the diagnostic conditions are fulfilled, the timers are incremented, outside the diagnostic conditions they are decremented (counted down).
- Counter 1 is incremented by "1" as soon as counter 2 reaches the value "255." If the value 255 is reached, counter 2 goes back to "0" and starts to increment again up to "48" (reading time 1).
- If reading time 1 has been reached, the Engine Control Module (ECM) -J192- checks the EGR temperature (display field 4). If the EGR temperature is greater than 50°C (122°), the diagnosis is OK and the diagnostic program is discontinued. If the EGR temperature during reading time 1 is less than 50°C (122°F), counter 2 counts up to "160"(reading time 2).
- When reading time 2 is reached, the -J192- checks the EGR temperature (display field 4) again. If the EGR temperature is now greater than 50°C (122°F), the diagnosis is OK and the diagnostic program will be discontinued. If the EGR temperature is again less than 50°C (122°F), the EGR flow test is carried out again.
- If the EGR flow test is to be carried out selectively or after an OK diagnosis, stop the engine and start it again.
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