Fuel Injector
2011 Ford F-150 · 5.0L V8 Coyote
Sensor Type
inductive
Waveform Type
pulse-width
Location
Mounted in fuel rail, 8 injectors positioned between intake runners on both cylinder banks
Pins
2-pin connector
Idle Frequency
13.3 Hz
Timebase
10ms/div
Voltage Scale
5V/div
Trigger
6V, falling edge
Wiring
One wire from PCM (various colors, cylinder-specific), one common power wire (Red/Light Blue or Pink/Light Blue stripe)
Expected Voltage Range
At Idle
0V to 12.5V
At Higher RPM
0V to 12.5V
Expected Pattern
Square wave pulse showing injector opening (voltage drop to near 0V) with peak-and-hold or saturation current control, followed by inductive kickback spike when injector closes
Known-Good Waveform
Injector pulse starts with battery voltage dropping sharply to approximately 0.5V when PCM grounds the circuit. Pulse width at idle is typically 2.5-4ms. When injector closes, clean inductive kickback spike rises to 50-80V (may be clamped by scope), followed by dampened oscillations. All 8 injectors should show nearly identical pulse widths at steady idle.
Common Failure Patterns
Pulse width significantly longer on one or more injectors compared to others at idle
Cause: Clogged injector restricting flow, PCM compensating with longer pulse width to maintain fuel trim
Weak or absent inductive kickback spike, no oscillations after pulse
Cause: Shorted or open injector coil windings, failed injector
Diagnostic Tips
Compare all 8 injector pulse widths simultaneously if possible - variations greater than 0.3ms indicate issues. Ford 5.0L uses port fuel injection, so injector failures directly affect individual cylinder performance. Check fuel pressure (55-65 PSI) before condemning injectors.
Related Diagnostic Trouble Codes
P0200P0201P0202P0203P0204
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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