Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 123 (IGNITION/GLOW PLUG SYSTEM - 3.0L V6 AVK)IGNITION/GLOW PLUG SYSTEMIGNITION SYSTEM, CHECKINGKNOCK CONTROL STOP, CHECKINGTEST SEQUENCENOTES
1996 Audi A4 Base, Standard
Test sequence: Notes
1996 Audi A4 Base, StandardSECTION Notes
WARNING: This page is about a different car, the 2004 Audi A6, 2003 Audi A6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
- Connect testing and information system VAS5051. See VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECTING FUNCTIONS . Select vehicle system "01 - Engine electronics". Engine must be running at idling speed.
Display on VAS5051:
- Under -1- select diagnostic function "08 - Read measured value block".
Display on VAS5051:
- - Enter display group max. input value = 255
- Enter "020" for "display group number 020" in zone -2- and confirm entry by pressing -Q- button.
Display on VAS5051:
- Check indication in display fields -1- to -4-.DISPLAY ZONES IGNITION KNOCK CONTROL CHART
Display zones 1 2 3 4 Display group 020: Ignition knock control during driving Display xx.x ° CA xx.x ° ° CA xx.x ° CA xx.x ° CA Display Ignition angle retardation cylinder 1 through
Knock controlIgnition angle retardation cylinder 2 through
Knock controlIgnition angle retardation cylinder 3 through
Knock controlIgnition angle retardation cylinder 4 through
Knock controlSpecif. value 0 to 12 ° CA 0 to 12 ° CA 0 to 12 ° CA 0 to 12 ° CA Note: Evaluation : See EVALUATION OF IGNITION ANGLE RETARDATION table. NOTE: The numbers displayed in display zones 1 to 4 represent the actual ignition timing retardation due to the knock control of the individual cylinders. The ignition angle retardation is carried out late in ° CA (crankshaft degrees). - To change to display group 021, Press --> button.
Display on VAS5051:
- Check indication in display fields -1- and -2-.
DISPLAY GROUP 021: IGNITION KNOCK CONTROL DURING DRIVING
| Display zones | ||||
|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |
| Display Group 021: Ignition knock control during driving | ||||
| Display | xx.x ° CA | xx.x ° CA | ||
| Display | Ignition angle retardation cylinder 5 through Knock control |
Ignition angle retardation cylinder 6 through Knock control |
||
| Specif. value | 0...12 ° CA | 0...12 ° CA | ||
| Note: | Evaluation : See EVALUATION OF IGNITION ANGLE RETARDATION table. | |||
NOTE:
The numbers displayed in display zones 1 and 2 represent the actual ignition timing retardation due to the knock control of the individual cylinders. The ignition angle retardation is carried out late in ° CA (crankshaft degrees).
- Exit function "08 - Read measured value block" by pressing --> button.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.