Camaro V8-6.2L (2010)
Ignition Coil: Testing and Inspection
Electronic Ignition System Diagnosis
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Circuit/System Description
This ignition system uses individual ignition module/coil assemblies for each cylinder. The engine control module (ECM) controls the spark events by
transmitting the timing pulses on the ignition control circuits to the individual ignition module/coil assemblies in firing order sequence.
Diagnostic Aids
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Depending on location in the spliced ignition voltage circuit, a slight resistance can cause a misfire or a crank/no start condition. A voltage drop
test on the circuit will pinpoint this condition.
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A slight to moderate resistance on any ignition control circuit can cause a misfire before DTC P0351-P0358 sets.
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Extended engine cranking time may foul the spark plugs with excessive fuel.
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When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect both mating electrical terminals for
corrosion and terminal tightness.
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Use the J 35616 - GM-Approved Terminal Test Kit for any test that requires probing the underhood fuse block terminals, component wire harness
terminals, or the ECM wire harness terminals.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Connector
Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil/modules.
2. Ignition OFF, all vehicle systems OFF, it may take 2 minutes for all vehicle systems to power down, test for less than 5 ohm between the ground
circuit terminal A and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for less than 5 ohm between the low reference circuit terminal B and ground.
‹› If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
Note: If the ignition fuse is open, it will be necessary to test the spliced ignition circuits and the components for a short to ground.
