Code
P102F
RENAULT
P — Powertrain
- Injector 2 - circuit malfunction
Views:
UK: 18
EN: 27
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in injector 2 wiring (to battery or ground)
- Corroded, loose or damaged injector connector
- Failed fuel injector (coil open or shorted)
- Faulty ECM / damaged driver transistor
- Blown fuse or faulty relay powering injectors or ECU
- Intermittent contact due to chafed wiring or water ingress
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Rough idle or misfire on cylinder 2
- Reduced engine power or hesitation under load
- Increased fuel consumption and emissions
- Hard starting or intermittent stalling
- Code may be intermittent if wiring movement causes it
What to check
- Read freeze-frame and live data with a scan tool; note fuel trim and misfire counts for cylinder 2
- Visual inspection of injector 2 connector, wiring harness and ECM connector for corrosion, pin damage or chafe
- Check related fuses and relays for fuel injection/ECU power
- Measure injector 2 coil resistance with multimeter (vehicle off)
- Backprobe injector connector and verify supply voltage (key ON) and driver switching (cranking) with a noid light or oscilloscope
- Wiggle test harness with engine running while watching live data for interruptions
Signal parameters
- Injector coil resistance (cold): typically 1–20 Ω depending on injector type — consult vehicle spec
- Connector supply voltage (key ON / cranking): battery voltage (~11–14 V)
- Injector pulse width: varies with engine load and rpm (fractional ms to several ms) — monitor with scan tool
- ECU driver pulse: square wave switching to ground (verify presence with oscilloscope/noid light)
- Expected no-load idle injection pulses: short pulses consistent across cylinders
Diagnostic algorithm
- Retrieve full freeze-frame and related codes; note symptoms and when fault occurred.
- Perform a visual inspection: check injector 2 connector, pins, harness routing, and engine grounds for damage or corrosion.
- Verify power and ground at injector 2 connector with a DVOM: battery voltage present at supply terminal with key ON; good ground return when driver activates.
- Measure injector coil resistance (engine off). Compare to manufacturer spec. Replace if open or drastically out of range.
- Backprobe injector connector while cranking or running: use a noid light or oscilloscope to confirm driver pulses and proper waveform.
- Wiggle the harness and connector while observing live data to detect intermittent faults.
- If safe and practical, swap injector 2 with another cylinder’s injector and re-scan: if code follows the injector, suspect the injector; if it stays on cylinder 2, suspect wiring/ECU.
- Inspect/repair any damaged wiring, pins, or connectors. Repair insulation, replace connector, or splice properly using solder/heat-shrink or OEM-style repair parts.
- If wiring and injector check good, test or replace the ECM or have it bench-tested by a specialist.
- Clear codes and test drive to confirm the fault is resolved; verify no return and normal injector operation via live data.
Likely causes
- Poor connector contact or corrosion at injector 2
- Broken/chafed wiring or pin pushed out at the harness
- High resistance or open in injector coil
- Short to battery or ground in injector harness
- Less likely: ECU driver fault
Fault status
Status
Injector 2 electrical circuit malfunction detected. Check wiring, connector, supply, ground, injector coil and ECU driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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