Ignition Coil Primary
2018-2024 Toyota Camry · 3.5L V6
Sensor Type
inductive
Waveform Type
pulse-width
Location
Individual coil-on-plug assemblies mounted directly on each spark plug, valve cover top
Pins
2-pin connector
Idle Frequency
25 Hz
Timebase
10ms/div
Voltage Scale
5V/div for primary viewing
Trigger
7V, falling edge
Wiring
Power: Black/Yellow, Trigger/Control: Varies by cylinder (monitored from coil negative terminal)
Expected Voltage Range
At Idle
0V to 14V
At Higher RPM
0V to 14V
Expected Pattern
Clean switching pattern with sharp drop to near 0V during dwell, followed by inductive spike to 200-350V at plug firing
Known-Good Waveform
Primary waveform shows battery voltage flat-line during coil-off period, then sharp drop to near 0V as coil saturates (dwell time approximately 3-4ms at idle). At end of dwell, voltage spikes to 200-350V as magnetic field collapses, then oscillates and settles back to battery voltage. Dwell time increases with RPM.
Common Failure Patterns
Reduced or absent voltage spike, extended dwell time, excessive oscillation after spark event
Cause: Weak coil windings, internal coil breakdown, or failing igniter transistor in ECM
Diagnostic Tips
2GR-FKS engine uses smart coil control with ECM-integrated drivers. Always check connector moisture at valve cover coils as this is a common failure point. Compare dwell times across all six cylinders for consistency.
Related Diagnostic Trouble Codes
P0351P0352P0353P0354
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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