Automotive Manual PDF

In an age when there is growing tension between customer expectations of high engine performance, low fuel consumption and compliance with the legal requirements on the emission of airborne pollution, the ability of a vehicle to meet the most stringent emission standards is becoming an increasingly important aspect of its market appeal.
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The Audi 2.7 turbo engine has been around for some time now. As the engine ages the hoses connecting the turbo pluming can develop leaks. The goal of this document is to supplement AWE Tuning’s 2.7t pressure test document http://tinyurl.com/q45t4 in finding charge pressure leaks. An understanding of the 2.7t plumbing can help in diagnosing any leaks. The picture below is from the 2.7t study guide and shows the primary air path.
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850 turbo uses a Motronic 4.3 control system, which has a single Electronic Control Module (ECM) to control fuel injection and ignition systems. In addition, Motronic 4.3 control system incorporates an on-board diagnostic function. Signals from various sensors are monitored continuously. If certain signals are lost or become faulty, ECM will adopt fixed substitute values (limp-home mode) to enable vehicle to be driven for certain failures. Substitute values can be adopted for Engine Coolant Temperature (ECT) sensor signal, Throttle Position (TP) sensor signal, Mass Airflow (MAF) sensor signal, and oxygen sensor (HO2S) signal. See Fig. 1.
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Engine may be identified by using Vehicle Identification Number (VIN) stamped on a metal pad, located near lower left corner of windshield. The sixth and seventh character identifies engine model. Engine identification number, located on left side of cylinder block below cylinder head, may be required when ordering replacement parts.
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