Ignition Coil Secondary
2012 Ford F-150 · 3.5L V6 EcoBoost
Sensor Type
inductive
Waveform Type
pulse-width
Location
Coil-on-plug configuration, secondary output is integrated into each coil assembly directly above spark plug
Pins
Unknown
Idle Frequency
25 Hz
Timebase
5ms/div
Voltage Scale
5kV/div
Trigger
2kV, rising edge
Wiring
N/A - Secondary circuit is internal from coil to spark plug boot
Expected Voltage Range
At Idle
0V to 35000V
At Higher RPM
0V to 40000V
Expected Pattern
Firing spike of 15-25kV followed by spark line at 3-6kV for 1-2ms duration, then oscillating coil collapse pattern
Known-Good Waveform
Secondary should show sharp firing spike to 15-25kV, followed by relatively flat spark line at 3-6kV for approximately 1.5ms burn time. Coil oscillations after spark event should show 4-6 clean peaks diminishing in amplitude. Higher boost conditions may show increased firing voltage.
Common Failure Patterns
Firing voltage exceeds 30kV, spark line is sloped upward or absent, short burn time
Cause: Fouled or worn spark plugs, incorrect gap (should be 0.035-0.040 inch), carbon tracking in coil boot
Diagnostic Tips
Use capacitive pickup around coil tower or spark plug wire boot. EcoBoost engines run higher compression (10:1) and boost pressure which increases required firing voltage. Check for oil in plug wells which causes coil boot failure.
Related Diagnostic Trouble Codes
P0300P0301P0302P0303
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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