Operation CHARM
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Oldsmobile
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1987
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Firenza L4-121 2.0L VIN 1 TBI
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Repair and Diagnosis
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Relays and Modules
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Relays and Modules - Powertrain Management
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Engine Control Module
Engine Control Module
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Description and Operation
Electronic Spark Timing (EST)
Throttle Body Fuel Injection
Testing and Inspection
Locations
Service and Repair
Engine Control Module (ECM) Replacement
Port Fuel Injection
Throttle Body Fuel Injection
Diagrams
ECM Connector Terminal I.D. & Volt. Specifications: VIN 1
ECM Connector Terminal I.D. & Volt. Specs: VIN K, VIN R & VIN U
Specifications
VIN K, VIN R & VIN U
VIN 1
Technical Service Bulletins
