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 MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDIAGNOSTIC NOTES
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Diagnostic Notes
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Diagnostic Notes
DIAGNOSTIC NOTES
Before using this section you should have reviewed Checking the Basics and performed the On-Board Diagnostics procedures and made any necessary repairs, as directed by the On-Board Diagnostics system.
^ Several of the following symptom procedures call for a careful visual/physical check. This step is very important. It can lead to correcting a problem without further checks and can save valuable time.
^ Certain basic faults can be undetectable by the self-diagnostic system and in some cases can actually interfere with the self-checking and fault memory operation. Low battery voltage, for example, can cause erroneous faults to set in control unit fault memories or can cause a system to go into "limp home mode" or open loop operation without setting a fault in memory. On the other hand, system fault memories are cleared whenever the control unit or the battery is disconnected. Therefore, all fault memories should be read prior to any vehicle power interruption or troubleshooting.
DIAGNOSTIC CHARTS
The diagnostic charts contain groups of possible causes for each symptom. These procedures are not necessarily described in the order in which they should be performed. Proceed in a logical order, easiest to check or most likely cause first.
Before using this section you should have reviewed Checking the Basics and performed the On-Board Diagnostics procedures and made any necessary repairs, as directed by the On-Board Diagnostics system.
^ Several of the following symptom procedures call for a careful visual/physical check. This step is very important. It can lead to correcting a problem without further checks and can save valuable time.
^ Certain basic faults can be undetectable by the self-diagnostic system and in some cases can actually interfere with the self-checking and fault memory operation. Low battery voltage, for example, can cause erroneous faults to set in control unit fault memories or can cause a system to go into "limp home mode" or open loop operation without setting a fault in memory. On the other hand, system fault memories are cleared whenever the control unit or the battery is disconnected. Therefore, all fault memories should be read prior to any vehicle power interruption or troubleshooting.
DIAGNOSTIC CHARTS
The diagnostic charts contain groups of possible causes for each symptom. These procedures are not necessarily described in the order in which they should be performed. Proceed in a logical order, easiest to check or most likely cause first.
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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.