1998 AUDI A4 ignition

Notes on display field 3:

Digital idle speed control (ISC) is only active with the Closed Throttle Position (CTP) switch closed.
Ignition timing point access to digital ISC with open CTP switch: 0.0 crankshaft. During "Basic Setting" function 04, digital ISC is blocked, display shows 0.0 crankshaft. Ignition timing point access to DLS during "Read Measuring Value Block" function 08 at idle without electrical consumers:
0.0 3.0 crankshaft.
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01-194
Display group 012 Display shows
Specified display value
Designation
Basic setting 12
1 2 3 4 ... RPM 1 = Momentary engine speed Display group 003, display field 1 ... % 2 = Momentary engine load Display group 003, display field 2 First map or second map 3 = Ignition timing point map switching

_._ crankshaft
4 = Ignition timing pt. retard by knock control (average of all cyl.)
Notes on display field 3:
The ignition timing point map switching is selected by knock control:

First map = Ignition timing point - basic map (98 octane)
Second map = Ignition timing point - map with reduced ignition angles (95 octane)
The ignition timing point difference between the first map and the second map is approx. 3 crankshaft. If an ignition timing
point retarded by approx. 4 crankshaft is recognized (display field 4), the second map is selected Display groups 013 and
014 for more exact evaluation.
The second ignition timing point map is selected:

If there is poor fuel quality (less than 95 RON)
If there are abnormal engine noises (subassemblies loose)
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If there is engine damage (oil burning because of faulty piston)
If a knock sensor malfunction is recognized in DTC memory, ignition map switching is blocked.
Notes on display field 4:
Knock control is active starting at an engine load greater than 40% Display groups 013 and/or 014. The ignition timing point retarding values are only used when knock control is "active."
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01-195
Display group 013 Display shows
Specified display value
Designation
Basic setting 13
1 2 3 4 First map
and/or
second map 1 = Ignition timing point map switching display group 012, display field 3
_._ crankshaft
2 = Ignition timing point retarded by knock control (cylinder 1)

_._ crankshaft 3 = Ignition timing point retarded by knock control (cylinder 2)

_._ crankshaft 4 = Ignition timing point retarded by knock control (cylinder 3)
Display group 014 Display shows
Specified display value
Designation
Basic setting 14
1 2 3 4 First map
and/or
second map 1 = Ignition timing point map switching display group 012, display field 3
_._ crankshaft
2 = Ignition timing point retarded by knock control (cylinder 4)

_._ crankshaft 3 = Ignition timing point retarded by knock control (cylinder 5)

_._ crankshaft 4 = Ignition timing point retarded by knock control (cylinder 6)
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01-196
Display groups 013 and 014
Notes on display fields 2, 3 and 4:
Knock control is active starting at an engine load greater than 40%. If the engine load exceeds 40%, the current ignition timing
point retarding value is displayed; if the engine load drops below 40%, the last values used are displayed constantly.
If there is audible knocking without recognizable retarding of the ignition timing point, the engine speed should be increased
over 3500 RPM for 5 seconds to initiate the knock sensor malfunction recognition (On Board Diagnostic).
If an ignition timing point retarding value of one cylinder deviates from the others, the following malfunctions are possible:

Loose subassemblies
Corrosion on the harness connector
Engine damage (e.g. oil combustion with faulty piston)
If there are high ignition timing point retarding values on all cylinders of bank 1 or bank 2, the following malfunctions are
possible:
Corrosion on the harness connector display groups 015 and 016 Knock sensor tightening torque, 20 Nm (14 ft lb), not OK
Open circuit display groups 015 and 016 Knock sensor faulty
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Loose subassemblies
If there are high ignition timing point retarding values on all six cylinders (banks 1 and 2), the car has been filled with fuel
having low octane (less than 98 RON).
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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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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
Pa
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