Operation CHARM
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Pontiac
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1987
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J2000/Sunbird L4-121 2.0L
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Repair and Diagnosis
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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
Electronic Spark Timing (EST)
Modes of Operation
Acceleration Mode
Battery Voltage Correction Mode
Clear Flood Mode (Port and TBI Injection)
Deceleration Mode
Fuel Cutoff Mode
Run Mode
Starting Mode (Port and TBI Injection)
Port Fuel Injection
Throttle Body Fuel Injection
Testing and Inspection
Chart C-1 ECM Quad Driver (QDR) Check
Checking Control Module For Bad Solder Joints
Locations
Service and Repair
Engine Control Module (ECM) Replacement
Port Fuel Injection
Electronic Control Module (ECM), Replace
PROM or Mem-Cal Replacement
Throttle Body Fuel Injection
Diagrams
With Port Fuel Injection
Part 1 of 2
Part 2 of 2
With Throttle Body Fuel Injection
Specifications
ECM Pinout and Voltage Values
Port Fuel Injection (Turbocharged Models Only - VIN M)
Technical Service Bulletins
