Code
P102E
DACIA
P — Powertrain
Injector 1 - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Broken, chafed or pinched wiring in injector 1 harness
- Corroded, damaged or loose injector connector or pins
- Open or short to ground/battery in the injector feed or return circuit
- Blown fuse or faulty power supply/relay for injectors
- Failed injector (internal short or open coil)
- Faulty engine control module (ECM/PCM) driver output
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Rough idle or vibration, misfire on cylinder 1
- Reduced engine power or hesitation
- Hard starting or extended crank time
- Increased fuel consumption and emissions
- Possible audible clicking difference at injector 1
What to check
- Read stored/active DTCs and freeze‑frame data with a scan tool; note conditions when code set
- Visually inspect injector 1 connector, wiring harness and nearby components for damage, contamination or pin corrosion
- Check related fuses and injector power/relay circuits
- Compare injector 1 electrical connector pins to other injector connectors for damage
- Measure injector coil resistance at the connector and compare with manufacturer specification
- Backprobe injector 1 with oscilloscope or multimeter while cranking/running to confirm command signal and supply voltage
Signal parameters
- Injector supply voltage: approx. battery voltage (~11–14.5 V with engine running) present on feed pin when ignition ON
- Injector coil resistance: depends on injector type — commonly in the range of 1–16 ohms (check vehicle/service manual for exact spec)
- Command waveform: pulsed drive from ECU switching driver to ground; observed as a square pulse 0 V (on) to ~battery (off) on the injector drive pin
- Typical pulse durations vary with load/engine speed (milliseconds); frequency increases with RPM
Diagnostic algorithm
- Record freeze frame and live data; confirm P102E is current or was stored. Clear codes and attempt to re-create.
- Perform visual inspection of injector 1 connector, wiring harness, and related grounds; repair any obvious damage or corrosion.
- Verify power feed to injector: with ignition ON, measure battery voltage at the injector feed pin; check fuses/relay if no feed.
- Measure injector coil resistance (engine off) at the connector and compare to spec. Replace injector if out of range.
- Backprobe injector while cranking/running: confirm the ECU is commanding the injector (switching pulse) and that supply voltage is stable.
- Perform a wiggle test of the harness/connector while monitoring live data to find intermittent connections.
- Swap injector 1 with another known-good injector (same type). If the code moves to the other cylinder, suspect the injector. If it stays on cylinder 1, suspect wiring/ECU.
- If wiring harness and injector check OK, perform continuity/resistance checks between injector connector and ECU pins; check for short to ground or battery.
- If wiring is good and fault remains, consider ECU driver failure — confirm with wiring harness bench tests or consult manufacturer guidance before replacing ECU.
- After repairs, clear codes and test drive to verify the fault does not return and engine runs normally.
Likely causes
- Connector corrosion or bent pins at injector 1
- Open or shorted wire between injector and ECU (chafe/wear)
- Injector coil resistance out of specification (internal failure)
- Intermittent connection from vibration or a loose connector
- ECU driver stage fault (less common, suspect after wiring and injector checks)
Fault status
Status
Injector 1 circuit malfunction. ECM detected abnormal electrical behaviour (open, short, high resistance or intermittent) in the fuel injector circuit for cylinder 1.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P102E
RENAULT
P — Powertrain
- Injector 1 - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Broken, chafed or pinched wiring in injector 1 harness
- Corroded, damaged or loose injector connector or pins
- Open or short to ground/battery in the injector feed or return circuit
- Blown fuse or faulty power supply/relay for injectors
- Failed injector (internal short or open coil)
- Faulty engine control module (ECM/PCM) driver output
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Rough idle or vibration, misfire on cylinder 1
- Reduced engine power or hesitation
- Hard starting or extended crank time
- Increased fuel consumption and emissions
- Possible audible clicking difference at injector 1
What to check
- Read stored/active DTCs and freeze‑frame data with a scan tool; note conditions when code set
- Visually inspect injector 1 connector, wiring harness and nearby components for damage, contamination or pin corrosion
- Check related fuses and injector power/relay circuits
- Compare injector 1 electrical connector pins to other injector connectors for damage
- Measure injector coil resistance at the connector and compare with manufacturer specification
- Backprobe injector 1 with oscilloscope or multimeter while cranking/running to confirm command signal and supply voltage
Signal parameters
- Injector supply voltage: approx. battery voltage (~11–14.5 V with engine running) present on feed pin when ignition ON
- Injector coil resistance: depends on injector type — commonly in the range of 1–16 ohms (check vehicle/service manual for exact spec)
- Command waveform: pulsed drive from ECU switching driver to ground; observed as a square pulse 0 V (on) to ~battery (off) on the injector drive pin
- Typical pulse durations vary with load/engine speed (milliseconds); frequency increases with RPM
Diagnostic algorithm
- Record freeze frame and live data; confirm P102E is current or was stored. Clear codes and attempt to re-create.
- Perform visual inspection of injector 1 connector, wiring harness, and related grounds; repair any obvious damage or corrosion.
- Verify power feed to injector: with ignition ON, measure battery voltage at the injector feed pin; check fuses/relay if no feed.
- Measure injector coil resistance (engine off) at the connector and compare to spec. Replace injector if out of range.
- Backprobe injector while cranking/running: confirm the ECU is commanding the injector (switching pulse) and that supply voltage is stable.
- Perform a wiggle test of the harness/connector while monitoring live data to find intermittent connections.
- Swap injector 1 with another known-good injector (same type). If the code moves to the other cylinder, suspect the injector. If it stays on cylinder 1, suspect wiring/ECU.
- If wiring harness and injector check OK, perform continuity/resistance checks between injector connector and ECU pins; check for short to ground or battery.
- If wiring is good and fault remains, consider ECU driver failure — confirm with wiring harness bench tests or consult manufacturer guidance before replacing ECU.
- After repairs, clear codes and test drive to verify the fault does not return and engine runs normally.
Likely causes
- Connector corrosion or bent pins at injector 1
- Open or shorted wire between injector and ECU (chafe/wear)
- Injector coil resistance out of specification (internal failure)
- Intermittent connection from vibration or a loose connector
- ECU driver stage fault (less common, suspect after wiring and injector checks)
Fault status
Status
Injector 1 circuit malfunction. ECM detected abnormal electrical behaviour (open, short, high resistance or intermittent) in the fuel injector circuit for cylinder 1.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email