ICU – Ignition Control Unit 2017
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The ICU is an electronic module that manages the ignition, safety switches, diagnostics, and various starting states of a Jetsurf motorized surfboard. ICU – Ignition Control Unit 2017
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It controls the logic for powering up the system, the engine start sequence, diagnostics, detecting faults, and ensuring safe operation.
🔍 Key Functions & States
According to Jetsurf’s documentation, the ICU operates with several basic states and signals:
| State | What Happens / Purpose |
|---|---|
| POWER OFF | System is off, no LED indicator lit. ICU is inactive. |
| POWER ON / ICU DIAGNOSTICS | When the key is inserted, ICU powers up, runs diagnostics (battery, pump, etc.). LED shows red then orange. |
| IDLE (Initial State) | After diagnostics, if the key is removed, ICU enters idle — often runs bilge pump, sucks water out. LED slowly flashes orange. |
| RIDE | When key inserted again, engine (or relevant circuits) enabled, can ride. LED flashes green. |
| ENGINE CLEANING | Special function to clean out water/fuel from engine/system. LED flashes fast in orange. Key needs to be left in “CLEANING/OFF” position. |
| FAULT | If something wrong (sensor, wiring, etc.), ICU indicates fault via LED (flashing red). Error codes are signaled until key removed. |
đź”— Compatibility & Part Information
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Part number A000094 refers to the ICU 2017 version.
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It is used in all 2017 Jetsurf models, and also in UltraSport 2018.
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It is not for the 2016 or later models beyond those listed, unless explicitly stated.
🔧 How to Use / Starting Procedure
From Jetsurf’s user instructions:
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Activate ICU (Stage One)
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Insert the engine shut‑off key in the switch on the handle for at least 4 seconds (but no more than 30).
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Then remove the key.
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This turns the ICU on, activates auxiliary systems (e.g. bilge pump). An LED may light up, and you may hear the bilge pump.
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Start the Engine (Stage Two)
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Insert the key again.
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There is a programmed ~3‑second delay by the ICU, giving time for the rider to get ready and securely hold the handle.
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After that, the starter engages and starts the engine.
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Stopping / Safety
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Pulling the key out of the shut‑off switch will turn off the running engine.
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🔧 How to Replace the ICU
If you need to swap out the ICU, here’s the procedure:
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Wait until engine is cooled down (at least ~30 min).
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Make sure ignition is OFF (LED not lit/flashing).
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Remove the fuel tank (disconnect tubes, unclamp Velcro straps).
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Disconnect all connectors from the ICU: includes wiring to ignition, water pump, etc.—typically 6 connectors in total.
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Take out mounting screws/Velcro holding the ICU in place.
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Install the new ICU, reconnect all connectors, use proper thread locker adhesives (Jetsurf specifies Loctite 243 and 638 for certain bolts)......
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