Code
P1298
PEUGEOT
P — Powertrain
Injector 4 control malfunction
Views:
UK: 2
EN: 4
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or short in injector 4 wiring harness
- Corroded, loose or damaged injector connector
- Failed or sticking injector (mechanical or electrical)
- Faulty injector driver inside the PCM/ECM
- Poor power supply or ground to the injector circuit (fuse, relay, ground)
- Intermittent connection from vibration or water ingress
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or vibration (misfire) from cylinder 4
- Loss of power or poor acceleration
- Hard starting or intermittent starting issues
- Higher fuel consumption and increased emissions
What to check
- Read and record freeze frame and all stored codes with a capable scanner
- Visual inspection of wiring harness and connector for injector 4 (damage, corrosion, water)
- Check battery voltage and main grounds before testing (stable >12V)
- Check fuses/relays related to fuel injection/powertrain
- Back-probe injector connector to confirm supply voltage and ground when engine cranks/runs
- Measure injector coil resistance and compare to manufacturer spec
Signal parameters
- Injector coil resistance (ohms) — spec varies by engine; compare to other injectors
- Battery/supply voltage at injector connector (V) during cranking and running
- Injector driver voltage waveform (V) — on/off switching profile
- Injector current (A) if current sensing available
- Injector pulse width (ms) and duty cycle (%) from the ECU or oscilloscope
- Presence/absence of expected switching/transients and end-of-pulse spikes (waveform shape)
Diagnostic algorithm
- Use a scan tool to read all codes and freeze-frame data. Note engine conditions when DTC set.
- Perform visual inspection of injector 4 connector, wiring harness, and nearby components for damage, corrosion or pinch points.
- Verify battery voltage and inspect related fuses/relays. Repair any power/ground issues first.
- Unplug connector and check terminal condition; clean and re-seat connector. Check for continuity between connector and PCM pin.
- Measure injector 4 coil resistance with a multimeter and compare to specification and other injectors. Replace if open/short or out of range.
- Back-probe connector with engine cranking/running: confirm constant supply voltage and PCM switching to ground (or correct polarity).
- If available, use an oscilloscope to compare injector 4 waveform to a known-good cylinder; look for missing switching, excessive noise, or slow rise/fall indicating driver or coil faults.
- If electrical checks point to the injector, swap injectors between cylinders and re-scan to see if code follows the injector (indicates bad injector) or stays on cylinder 4 (indicates wiring/PCM).
- Repair any wiring damage, replace injector or connector as indicated. If wiring and injector test good but fault persists, suspect PCM driver fault — consult manufacturer service information before replacing PCM.
- Clear codes, perform test drive and re-check for return of fault. Document repairs and results.
Likely causes
- Damaged insulation or chafed wiring to injector 4 causing short-to-ground or short-to-battery
- Corrosion or bent pins in the injector connector preventing proper contact
- Injector coil resistance out of specification (open or shorted coil)
- PCM transistor or driver channel failure for injector 4
- Low battery voltage or poor ground affecting driver operation
Fault status
Status
P1298 — Injector 4 control malfunction. The powertrain control module detected abnormal behavior in the injector 4 control circuit (open, short, unexpected current/waveform). MIL may be set and diagnostic data recorded.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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