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Unformatted text preview: E - THEORY/OPERATIONArticle Text1989 Volkswagen GolfFor Volkswagen Technical Site Copyright 1998 Mitchell Repair Information Company, LLCMonday, August 23, 1999 11:48PMARTICLE BEGINNING1989 ENGINE PERFORMANCEVolkswagen Theory & Operation - CIS-EFox, Golf, Golf GT, JettaINTRODUCTIONThis article covers the basic description and operation ofengine performance related systems and components. Prior to diagnosingvehicles or systems with which you are not completely familiar, readthrough this article.Bosch CIS-E fuel injection system uses Continuous InjectionSystem (CIS) for fuel delivery and electronic controls for mixtureadjustment. Mechanical portion of CIS-E system consists of MixtureControl Unit (MCU) which is also known as the fuel distributor,airflow sensor plate, diaphragm pressure regulator, fuel injectors,fuel pumps and filter.Electronic controls consist of airflow sensor positionindicator (potentiometer), Differential Pressure Regulator (DPR),thermo time switch, coolant temperature sensor, Electronic ControlUnit (ECU), oxygen sensor, auxiliary air regulator, idle speedstabilizer control unit, cold start valve, idle speed boost valve.COMPUTERIZED ENGINE CONTROLSCONTROL UNITNOTE: For ease of understanding, components are grouped into 2categories. The first category, INPUT DEVICES, iscomponents which control or produce voltage signals that aremonitored by the ECU. The second category, OUTPUT SIGNALS,are components that are controlled by the ECU (this isusually accomplished by the ECU grounding individualcircuits).Electronic Control Unit (ECU)ECU is found behind plenum panel on driver's side of vehicle.ECU must not be exposed to temperatures above 180F (85C). ECU unitutilizes various input signals to control fuel delivery.Idle Speed Stabilizer Control UnitThis unit is located near the fuse relay panel. Idle speedstabilizer control unit receives signals from ignition coil tachsignal. When engine speed drops below 750 RPM, idle speed stabilizercontrol unit energizes the auxiliary air regulator to raise enginespeed.INPUT DEVICESE - THEORY/OPERATIONArticle Text (p. 2)1989 Volkswagen GolfFor Volkswagen Technical Site Copyright 1998 Mitchell Repair Information Company, LLCMonday, August 23, 1999 11:48PMAll vehicles are equipped with different combinations ofinput devices. Not all devices are used on all models. To determinethe input usage on a specific model, see L - WIRING DIAGRAMS article.the input usage on a specific model, see L - WIRING DIAGRAMS article....
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This note was uploaded on 10/04/2010 for the course ENGINEERS 22453175 taught by Professor Heydari during the Spring '08 term at Miami University.
- Spring '08