Operation CHARM
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Cadillac
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1991
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Allante V8-273 4.5L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Engine Control Module
Engine Control Module
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Description and Operation
Testing and Inspection
Initial Inspection and Diagnostic Overview
ECM Diagnostics Flow
Flow of Diagnostics
Inputs
Outputs
Overrides
Snapshot Mode
Status Lights
Component Tests and General Diagnostics
Chart C-1 PCM/ECM Replacement Check
ECM Status Lights
Scan Tool Testing and Procedures
Locations
Body Computer Module (BCM)
Dash Harness View
Powertrain Control Module (PCM)
Service and Repair
Diagrams
Technical Service Bulletins
