Operation CHARM
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Volkswagen
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1991
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GTI L4-1984cc 2.0L DOHC (9A)
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Repair and Diagnosis
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Powertrain Management
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Relays and Modules - Powertrain Management
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Relays and Modules - Computers and Control Systems
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Engine Control Module
Engine Control Module
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Description and Operation
California Models
Federal Models
Testing and Inspection
Component Tests and General Diagnostics
Control Unit
Deceleration Fuel Shut-Off
Enrichment System
Cold Acceleration Enrichment
After-Start and Warm-Up Enrichment
Pinout Values and Diagnostic Parameters
CIS-E System ECM Pin-Out Test
Control Module Pinout Values
Voltage Measurements
Ohms Measurements
Locations
Service and Repair
Diagrams
Diagram Information and Instructions
Understanding Track Style Wiring Diagrams, Important Stuff !
How to Find the Correct Wiring Diagram, Important Stuff !
How to Read Displayed Page of Wiring Diagram, Important Stuff !
Wiring Diagram Circuit Identification
Symbols Used In Wiring Diagrams
Wire Color Code Identification
Wire Size Conversion
Connector Views
Electrical Diagrams
Technical Service Bulletins
