Code
P0206
MITSUBISHI
P — Powertrain
No.6 injector system
Views:
UK: 11
EN: 13
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or shorted injector wiring (connector, harness chafe, broken wire)
- Corroded or loose injector connector pins
- Failed fuel injector (internal coil open/short or mechanical stuck)
- Faulty injector driver inside the ECM/PCM
- Blown fuse or faulty power/ground supply to injectors
- Intermittent connection or water intrusion
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or pronounced vibration
- Misfire felt or detected on cylinder 6 (may set P0306)
- Poor engine performance and reduced power
- Hard starting, decreased fuel economy
- Increased exhaust emissions or failed emissions test
What to check
- Read freeze frame and stored codes; note conditions when code set
- Visual inspection of injector connector, wiring harness and nearby harness routing
- Check for related codes (P0200–P0208, P0306) and battery voltage issues
- Measure injector coil resistance with an ohmmeter at the connector
- Back-probe injector connector with engine cranking/running to check for pulse (noid light or oscilloscope)
- Verify injector supply voltage (key ON) and good ground
Signal parameters
- Injector coil resistance: typically low-impedance 2–4 Ω or high-impedance 10–16 Ω (consult vehicle spec)
- Injector supply voltage (key ON): near battery voltage (~11–14 V)
- Driver output: pulsed waveform (injector pulse) when engine cranking/running — pulse width typically 0.5–10 ms depending on conditions
- When activated the driver usually pulls the injector circuit toward ground (voltage near 0 V on the driver side)
- No pulse or a constant open/short condition is abnormal
Diagnostic algorithm
- Verify the code and related codes; record freeze-frame data and recreate operating conditions if safe.
- Perform a visual inspection of the No.6 injector connector, wiring, and pins for corrosion, damage, or loose connectors.
- With ignition OFF, measure injector coil resistance at the harness; compare to manufacturer spec. An open or shorted coil indicates a bad injector.
- With ignition ON (engine stopped) check for battery voltage at the injector power feed. Confirm a good ground return.
- Start engine or crank and check for injector drive pulse using a noid light or oscilloscope on the signal pin. If no pulse, verify ECM driver output.
- Wiggle the harness and connectors while monitoring to detect intermittent faults. Reinspect any areas of chafe or pinching.
- Swap the No.6 injector with a known good injector from another cylinder (if identical) and see if the code follows the injector (fault follows = bad injector).
- If the injector hardware is good and the wiring/power/ground are intact but no proper driver pulse, suspect ECM driver failure — confirm with wiring continuity checks to rule out short to battery or ground before replacing ECM.
- After repair, clear codes and perform a test drive to confirm the issue is resolved and no related codes return.
Likely causes
- Damaged/shorted wiring at the No.6 injector harness or connector
- Corroded or bent pins at the injector connector
- No6 injector coil open or shorted (internal failure)
- ECM injector driver transistor failed on the No.6 channel
- Loss of injector supply voltage or poor ground at cylinder 6
- Intermittent fault due to engine vibration or wiring chafe
Fault status
Status
P0206 — Injector Circuit/Open: Control module detected an electrical fault (open, short, or no pulse) on the No.6 fuel injector circuit.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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