AUDI A4 1999 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-200

Display shows
Specified display value
Designation
Basic setting 17
1 2 3 4 0 - 1 1 = Timer 1 (final value = 1)
0 - 225 2 = Timer 2 (final value = 48 or 160)
30% - 60% 3 = Momentary engine load

0C - 255C
4 = Exhaust gas recirculation temperature (EGR temperature sensor -G98-)
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.
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 F), 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.
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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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01-201
Display group 018 Display
shows Specified display
value Designation
Basic setting
18
1 2 3 4 __ % 1 = Internal duty cycle (triggering) - Idle Air Control (IAC) valve -N71-
_.___ A 2 = Idle Air Control (IAC) valve -N71- current
-40 to +60% 3 = Power control from Idle Air Control (IAC) valve -N71-
12,000 - 14,000 V 4 = Engine Control Module (ECM) -J192- voltage supply (battery voltage) display
group 001, display field 1 Note on display field 1:
The internal calculation value in the engine control module for the duty cycle is displayed without power and voltage
correction.
Note on display field 2:
The actual power draw by the Idle Air Control (IAC) valve -N71- is displayed.
Note on display field 3:

Positive values indicate increase in the duty cycle, in order to reach the specified current.
Negative values indicate a decrease in the actual duty cycle to reach the specified current.
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If +60% is displayed for a longer time , this indicates contact resistance and/or an adjuster that is too hot.
If -40% is displayed for a longer time, this indicates a winding short in the idle adjuster.
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01-202
Display group 019 Display shows
Specified display value
Designation/diagnose
Basic setting 19
1 2 3 4 At idle: 1.5 - 3.5% 1 = Momentary engine power (internal computation value)
At 2500 RPM:
6.5 - 9.5%
At idle:
3.0 - 5.5 g/s 2 = Intake air quantity (via mass air flow sensor)
At 2500 RPM:
9.5 - 13.5 g/s
___ km/h 3 = Momentary vehicle speed display group 003, display field 4 _._ m/s 4 = Fuel injection time (average of all cylinders) Note on display field 1:
The momentary engine power is a control module-internal calculated value that is calculated from the amount of air taken in
under normal conditions (air pressure 1013 mbar, air temperature 20 C or 68 F).
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01-203
Display groups 020 and 021
Note:
Display groups 020 and 021 are only considered in vehicles with Secondary Air Injection (AIR) system. Display shows
Display/specified value
Designation/diagnose
Basic setting 20
1 2 3 4 0% 1 = Lean time of bank 1, HO2S 1 voltage signal
0% 2 = Lean time of bank 2, HO2S 1 voltage signal
69% 3 = Diagnosis limit value
00000000 4 = Diagnosis condition and/or result Display group 021 Display shows
Display/specified value
Designation/diagnose
Basic setting 21
1 2 3 4 0.0% 1 = Oxygen sensor control, bank 1 richens
0.0% 1 = Oxygen sensor control, bank 2 richens
14.0% 3 = Diagnosis limit value
00000000 4 = Diagnosis condition and/or result
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01-204
Display group 022
Notes:
Display group 022 should only be considered on vehicles with traction control (ATC).
Vehicles with traction control (ATC) can be recognized by the ATC indicator light in the instrument cluster and/or ABS (ATC)
On Board Diagnostic (OBD).
Repair Manual, Brake System On Board Diagnostic (OBD), Repair Group 01.

The wheel slip information for traction control (ATC) is calculated in the ABS control module. If slip is recognized, the ABS
control module requests a reduction in torque from the Engine Control Module (ECM). This torque reduction is divided into 12
reducing stages.
With a cold engine, coolant temperature less than 20 C (68 F), the reduction of engine torque is obtained:
With retarded ignition timing angle for lower reducing stages (1-5)
By brief shut-off of individual fuel injectors for higher reducing stages (6-12)
If the engine is warm, coolant temperature greater than 40 C (104 F), the engine torque reduction is obtained only by briefly
switching off individual fuel injectors.
Display shows
Display/specified value
Designation
Basic setting 22
1 2 3 4 0 - 12 1 = Reducing stages

_._ crankshaft
2 = Ignition timing point retarded by ATC (only with cold engine)
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-68 Nm to 250 Nm 3 = Reduced engine torque (actual moment)
-68 Nm to 250 Nm 4 = Unreduced engine torque
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01-205
Display group 023 Display shows
Display/specified value
Designation
Basic setting 23
1 2 3 4 X 1 = Upshift or downshift signal
XX 2 = Gear recognition signal and shifting signal
XX 3 = A/C compressor off/on and rear window heater signal
X 4 = A/C compressor shut-off Notes on display field 1:

The signal for upshift and downshift will only be output by the Transmission Control Module (TCM) for the automatic
transmission 01V. For vehicles without automatic transmission 01V, a "1" is always displayed.
Check upshift and downshift signal page 24
-103
.
X
Meaning of 1-digit display:

With vehicle not running:
Value "0" = Selector lever in R
Value "1" = Selector lever in 2,3,4,D,P,N

When driving-vehicle speed greater than 14 km/h (9 mph):
Value "0" = Ignition angle retarded for downshift selected
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Value "1" = Ignition angle retarded for upshift selected
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