921803-0518 Tohatsu SCREW

Alert Indicator Lamp Always FLASHING
This procedure is for the coolant level switch with a continuously flashing alert indicator.The "ALWAYS FLASHING" condition is probably caused by an undesired open circuit or a faulty main display module (unlikely condition).
Locate Switch 6 that always flashes the low coolant level indicator.
Turn the "ECS" switch to the OFF/RESET position.
Locate the switch that corresponds to the coolant level alarm that always flashes. If necessary, use the Electrical System Schematic to assist in locating the switch.
Check for loose terminal connections or corroded terminal connections to the switch.
Clean corroded terminals and tighten loose connections.
Check The Harness.
Disconnect the signal wire from the switch.
Connect a jumper wire from the signal wire to the ground wire. If a ground wire is not near, connect the signal wire to the battery ground.
Turn the ECS to the COOLDOWN/STOP position.Expected Result: The indicator lamp should stop flashing.Results:
No - The engine harness is open or the main display module has a problem. Proceed to 3.
Yes - The circuit is operating correctly. The switch has a problem. Check the switch or replace the switch.
Check The Harness.
Turn the ECS to the OFF/RESET position.
On the Electrical System Schematic, trace the signal wire from the switch (pin 32) to the Main Display Module.
Determine the connector contact number for the signal at the Main Display Module.
Disconnect the engine harness from the Main Display Module.
At the engine harness connector for the Main Display Module, measure the resistance that is between the signal contact and contact 2 (ground).Note: The jumper wire from 2 is still connected.Expected Result: The resistance should be less than 5.0 ohms.Results:
No - The resistance is greater than 5.0 ohms. The engine harness has a problem. Repair the engine harness or replace the engine harness.
Yes - The resistance is less than 5.0 ohms. The harness resistance is correct. The Main Display Module has a problem. Replace the Main Display Module. For more information on the subject, see Testing And Adjusting, "Module - Replace".Indicator Lamp Never Flashes
This procedure is for the indicator lamp of the low coolant level switch that NEVER FLASHES. The "NEVER FLASHING" condition is probably caused by a short to ground or a faulty Main Display Module (unlikely condition).
Locate The Switch.
Turn the ECS to the OFF/RESET position.
Locate the switch that corresponds to the parameter that never flashes the indicator lamp. If necessary, use the Electrical System Schematic to assist in locating the switch.
Check for loose connections or corroded terminal connections to the switch.
Clean corroded terminals and tighten the loose connections.
Check The Harness.
Disconnect the signal wire from the switch.
Turn the ECS to the COOLDOWN/STOP position.Expected Result: The indicator lamp should flash.Results:
OK - The indicator lamp flashes. The circuit is operating correctly. The switch has a problem. Check the switch or replace the switch.
Not OK - The indicator lamp does not flash. The engine harness is open or the Main Display Module has a problem. Proceed to Step 3.
Check The Harness.
Turn the ECS to the OFF/RESET position.Note: The signal wire remains disconnected from the switch. Do NOT allow the contact to touch any other components.
On the Electrical System Schematic, trace the signal wire from the switch to the Main Display Module.
Determine the number for the signal contact at the Main Display Module.
Disconnect the connector contact for the signal at the Main Display Module.
At the engine harness connector for the Main Display Module, measure the resistance that is between the signal contact and contact 2 (ground).Expected Result: The resistance should be greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The harness resistance is correct. The Main Display Module has a problem. Replace the Main Display Module. For more information on this subject, see Testing And Adjusting, "Module - Replace".
Not OK - The resistance is less than 5000 ohms. The engine harness has a problem. There is a short between ground and the signal wire in the engine harness. Repair the engine harness or replace the engine harness. STOP.