Code
P2B02
Generic
P — Powertrain
Cylinder 3 Injection Pulse Performance
AI status
Completed
Completed
100%
Causes
- Faulty or sticking fuel injector (cylinder 3)
- Open, short, high resistance, or intermittent wiring/connector to injector 3
- Poor ground or supply power to the injector circuit
- Fuel pressure low or inconsistent (restrictive feed or failing pump/rail)
- Engine mechanical issue on cylinder 3 (low compression, valve/timing problem)
- PCM/ECM driver fault or corrupted software/calibration
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or shake felt at idle
- Misfire specifically traced to cylinder 3
- Reduced engine power, hesitation or stumble under load
- Increased fuel consumption or black exhaust smoke
- Difficult starting or occasional stalls
What to check
- Read freeze frame and live data: commanded injector pulse, injector current/duty, misfire counters, fuel trims, and fuel rail pressure
- Scan for related DTCs (injector circuit codes, misfire codes, fuel pressure, PCM errors)
- Visually inspect injector 3 connector, wiring harness and ground for damage, corrosion or loose terminals
- Measure injector 3 coil resistance and compare to manufacturer spec and other cylinders
- Check supply voltage and ground at injector connector with key ON
- Use a noid light or oscilloscope at injector connector to confirm pulses and waveform quality
Signal parameters
- Injector pulse width (typical): ~1–10 ms at idle, increasing with load; absolute values vary by engine — consult spec
- Duty cycle: 0–100% depending on load; abnormal or clipped duty may indicate driver saturation
- Injector coil resistance: common ranges — low impedance 2–6 Ω or high impedance 12–80 Ω; compare to vehicle spec and other cylinders
- Connector voltage: battery feed typically ~11–14 V on the constant side; switching side to ground pulses between ~0 V and open/near-battery voltage
- Waveform: clean square pulses on oscilloscope with consistent amplitude and timing; irregular, truncated or noisy pulses indicate circuit/driver issues
- Pulse frequency: tied to engine speed (each injector fires once per intake event for that cylinder)
Diagnostic algorithm
- Retrieve freeze frame and live data. Note engine speed, fuel rail pressure, injector pulse width/duty for cylinder 3 and compare to other cylinders.
- Inspect connector and wiring for cylinder 3 (pin corrosion, loose terminals, rubbing, heat damage). Wiggle harness while observing live data for intermittent faults.
- Measure injector coil resistance at terminal and compare to manufacturer spec and other injectors. Replace if out of range.
- Check supply and ground at the injector connector with key ON and during cranking. Repair any poor supply or ground.
- Use a noid light or oscilloscope at the injector connector to confirm presence, shape and timing of pulses. Compare waveform to a known-good cylinder.
- Swap the suspect injector with another cylinder (when accessible) and see if the fault/code/misfire follows the injector. If it does, replace the injector.
Likely causes
- Damaged wiring or poor connector at injector 3
- Faulty injector (electrical or mechanical)
- Low fuel pressure or clogged fuel filter causing abnormal injector behavior
- Bad ground or power feed to the injector circuit
- PCM driver failure (less common)
Fault status
Status
Cylinder 3 injection pulse performance: PCM detected injector pulse timing/duration inconsistent with expected values for cylinder 3.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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