Ignition Coil Secondary
2017 Toyota Corolla · 1.8L I4
Sensor Type
inductive
Waveform Type
pulse-width
Location
Coil-on-plug output measured at spark plug wire boot or using capacitive pickup
Pins
1-pin connector
Idle Frequency
25 Hz
Timebase
5ms/div
Voltage Scale
5kV/div
Trigger
2kV, rising edge
Wiring
N/A - measured using capacitive probe or direct high-voltage probe
Expected Voltage Range
At Idle
-1000V to 35000V
At Higher RPM
-1000V to 40000V
Expected Pattern
Firing spike 10-15kV, spark line 2-3kV for 1.5-2ms, followed by coil oscillations and dwell period
Known-Good Waveform
Firing line should reach 10-15kV with sharp rise, followed by relatively flat spark line at 2-3kV for duration of burn time. Coil oscillations after spark should show 3-5 dampening cycles. All cylinders should show similar patterns within 2kV variance.
Common Failure Patterns
Firing line exceeds 20kV, spark line slopes upward during burn time
Cause: Worn spark plugs with excessive gap, carbon fouling, or lean mixture increasing resistance
Diagnostic Tips
2ZR-FE uses iridium plugs with 0.043 inch gap. Carbon tracking in coil boots is common on high-mileage units. Compare all four cylinders simultaneously for consistent patterns - variance indicates specific cylinder issues.
Related Diagnostic Trouble Codes
P0300P0301P0302P0303
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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