🔍 Meaning
The PCM detects an anomaly in the injector #6 circuit:
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Control Logic:
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⚡ Injector activated → Expected voltage close to 0V.
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🔌 Injector deactivated → Expected voltage close to 12V (battery voltage).
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P0206 Trigger:
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Voltage or resistance out of specifications during the injection cycle.
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⚠️ Symptoms
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Cylinder 6 misfires
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Unstable idle
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Loss of power / Hesitant acceleration
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Engine light (MIL) on
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Possible gasoline smell (stuck open injector)
🔧 Priority Causes
| Rank | Cause | Details |
|---|---|---|
| 1 | Faulty injector | Out-of-spec resistance or mechanical blockage (most common cause). |
| 2 | Wiring problem | Short circuit/break in wires (signal, power, ground). |
| 3 | Damaged connector | Oxidized pins, broken wires, melted insulation. |
| 4 | PCM failure | Internal control error (rare, check last). |
🛠️ Diagnostic Procedure
Step 1: Electrical Tests (Multimeter)
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Injector resistance (engine off):
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Disconnect the connector.
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Measure between pins: 10–16 Ω (typical, refer to manufacturer’s manual).
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⚠️ If out of range → replace injector.
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Power supply voltage (engine off, key ON):
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Reconnect the connector, strip the + wire.
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Measure between + wire and ground: ≥ 10V.
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Step 2: Visual Inspection
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Connector: Corrosion, deformation, signs of overheating.
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Wiring: Frayed wires, rubbing against hot parts.
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Injector: Fuel leaks, cracks.
Step 3: Functional Test
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With diagnostic tool:
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Activate injector #6 → listen for a click (sign of operation).
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Alternative:
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Swap injector #6 with another cylinder → if the code follows (e.g., P020X), replace injector.
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Step 4: PCM Circuit Check
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Disconnect the PCM connector.
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Check continuity:
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Between injector #6 pin (PCM) and injector connector.
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Test for absence of short circuit:
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Between signal wire and chassis ground → resistance ∞ Ω.
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✅ Solutions
| Confirmed Fault | Action |
|---|---|
| Faulty injector | Replace. |
| Broken/short-circuited wiring | Repair harness or replace section. |
| Damaged connector | Replace connector. |
| Faulty PCM | Reprogram or replace (after eliminating other causes). |
⚠️ Pitfalls to Avoid
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Ground testing the PCM wire:
Never ground the control wire without resistance → risk of burning out the PCM. Use a test light or dedicated tool.
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High-impedance injectors:
Some recent models have piezo injectors (resistance > 100Ω) → check the technical sheet.
💡 Pro Tip
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After repair: reset fuel adaptations (via OBD-II tool) to clear previous trims.
Final check:
Clear the code.
Run a drive cycle → monitor misfires (OBD-II mode 6).