Fuel Injector
2021 Ford F-150 · 3.5L V6 EcoBoost
Sensor Type
inductive
Waveform Type
pulse-width
Location
Direct injection fuel rail mounted on intake side of cylinder head, 6 high-pressure piezo injectors
Pins
2-pin connector
Idle Frequency
25 Hz
Timebase
5ms/div
Voltage Scale
20V/div
Trigger
15V, rising edge
Wiring
Gray or Brown (PCM control, varies by cylinder) and Black (ground return through PCM)
Expected Voltage Range
At Idle
0V to 65V
At Higher RPM
0V to 65V
Expected Pattern
Peak-and-hold waveform: initial voltage spike to 55-65V for 0.3-0.5ms, then hold voltage at 12-14V for remainder of pulse width
Known-Good Waveform
Direct injection injectors show initial current inrush creating voltage spike to 55-65V as PCM applies boosted voltage for rapid pintle opening, followed by hold phase at battery voltage for 0.8-2.5ms at idle. Total pulse width varies 1.0-3.5ms depending on load. Injector should show clean cutoff with small inductive kickback spike of 80-100V when current stops.
Common Failure Patterns
Reduced peak voltage below 50V or absent hold phase
Cause: Weak injector driver circuit in PCM or high resistance in injector harness connector
Extended pulse width beyond 4ms at idle with rough running
Cause: Clogged injector restricting flow or low fuel pressure from high-pressure fuel pump failure
Diagnostic Tips
EcoBoost uses Bosch direct injection system operating at 2500+ PSI. Monitor injector current ramp rate during peak phase; slow ramp indicates high injector coil resistance from overheating. Compare all 6 injector waveforms as high-pressure pump delivers fuel sequentially and uneven flow indicates pump cam lobe wear.
Related Diagnostic Trouble Codes
P0200P0201P0202P0203P0204
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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