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 BASE, 2.8 K, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSINTRODUCTION
1995 Audi 90 Base, 2.8 K, Automatic
Engine Controls - System/Component Tests: Introduction
1995 Audi 90 Base, 2.8 K, AutomaticSECTION Introduction
CAUTION:
When battery is disconnected, radio will go into anti-theft protection mode. Obtain radio anti-theft protection code from owner prior to servicing vehicle.
Before testing separate components or systems, perform preliminary inspection. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in TESTS W/CODES article.
NOTE:
Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance unless otherwise instructed in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
ELECTRICAL COMPONENT LOCATIONS
| Component | Location | ||||
|---|---|---|---|---|---|
| Circuit Breakers | (1) In Passenger Footwell, In Electronic Box | ||||
| Closed Throttle Position (CTP) Switch | Part Of TP Sensor | ||||
| Component Connectors | See Fig 1 and Fig 2 | ||||
| Camshaft Position (CMP) Sensor | Rear End Of Left Cylinder Head | ||||
| Crankshaft Position (CKP) Sensor | On Left Side Of Cylinder Block | ||||
| Data Link Connector (DLC) | Behind Left Side Of Dash | ||||
| Electronic Box | In Passenger Footwell, Under Glove Box | ||||
| Elect. Control Module (ECM) | Passenger Footwell, In Electronic Box | ||||
| EGR Control Solenoid Valve | In Right Rear Corner Of Engine Bay | ||||
| EGR Temperature Sensor | Left Rear Corner Of Engine, On EGR Valve | ||||
| Engine Coolant Temperature (ECT) Sensor | To Rear Of Left Cylinder Head, On Coolant Pipe | ||||
| Engine Speed Sensor | On Left Side Of Transmission Bellhousing | ||||
| EVAP Control Solenoid Valve | In Right Rear Corner Of Engine Bay | ||||
| Fuel Pump Relay | Under Left Side Of Instrument Panel, In Fuse/Relay Block | ||||
| Fuses | In Fuse/Relay Block | ||||
| Fuse/Relay Block | Behind Left Side Of Instrument Panel | ||||
| Heated Oxygen Sensor (HO2S) | (2) * | ||||
| Idle Air Control (IAC) Valve | Right Rear Corner Of Intake Manifold | ||||
| Intake Manifold Change-Over (IMCO) Valve Control Solenoid | In Right Rear Corner Of Engine Bay | ||||
| Kickdown Switch | On Throttle Body | ||||
| Knock Sensor No. 1 | On Right Cylinder Bank, Under Intake Manifold | ||||
| Knock Sensor No. 2 | On Left Cylinder Bank, Under Intake Manifold | ||||
| Mass Airflow (MAF) Sensor | In Air Intake Hose | ||||
| Power Output Stage | On Right Side Of Engine Bay Firewall | ||||
| Throttle Position (TP) Sensor | On Throttle Body | ||||
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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.