3B7-87123-1 Tohatsu PISTON RING SET (STANDARD)

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Schematic diagram of the switch for oxygen calibrationThe engine is equipped with a remote control panel that includes a status control module and air/fuel ratio control.
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Schematic diagram of the switch for oxygen calibrationThe engine is configured for Canadian Standards Association (CSA). The engine is equipped with an optional remote control panel with air/fuel ratio control.Test Step 1. Check the Switch for Proper Mechanical Operation
Set the engine control to the "OFF/RESET" mode.
Remove the electrical power from the engine.
Verify that the switch for oxygen calibration is in the center position.
Move the switch to the upper position. Then release the switch. The switch should return to the center position.
Move the switch to the lower position. Then release the switch. The switch should return to the center position.Expected Result:The switch has proper mechanical operation.Results:
OK - The switch has proper mechanical operation. Proceed to Test Step 2.
Not OK - The switch does not return to the center position.Repair: Replace the switch. Verify that the original problem is resolved.STOPTest Step 2. Inspect the Electrical Connectors and the WiringNote: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following connectors:
J1/P1 connectors on the ECM
Connections for the switch for oxygen calibration
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Harness side of the P1 connector (P1-3) Ground for the sensors (P1-28) Switch input for oxygen calibration
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the switch for oxygen calibration.
Check the terminal strips for corrosion and for mechanical failure.
Check the harnesses and the wiring for abrasion and for pinch points between the switch for oxygen calibration and the ECM.Expected Result:The connectors, pins, and sockets are connected properly. The terminal strips do not have corrosion or mechanical failure. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 3.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 3. Check the Signal Wire for a Short Circuit
Disconnect the P1 connector.
Verify that the switch for oxygen calibration is in the center position.
Measure the resistance between terminals J1-3 and J1-28.Results:
OK - The resistance is greater than 5 Ohms. The signal wire does not have a short circuit. Proceed to Test Step 4.
Not OK - The resistance is less than 5 Ohms. The signal wire has a short circuit.Repair: The problem could be with a wire or with the switch. Repair the wire, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 4. Check the Wiring for an Open CircuitMeasure the resistance between terminals J1-3 and J1-28. Perform the following procedure:
Raise the switch for oxygen calibration to the upper position. The expected resistance value is less than 5 Ohms.
Release the switch. The expected resistance value is greater than 5 Ohms.
Lower the switch for oxygen calibration to the lower position. The expected resistance value is less than 5 Ohms.
Release the switch. The expected resistance value is greater than 5 Ohms.Results:
OK - All of the resistance readings are correct. The wiring does not have an open circuit and the switch is operating correctly.Repair: Reconnect the P1 connector. Attempt to duplicate the original problem. If you cannot duplicate the original problem, the problem is resolved. The original problem was probably caused by a poor electrical connection. If the original problem is not resolved, proceed to Test Step 5.
Not OK - At least one of the resistance readings is incorrect. The wiring has an open circuit or the switch is faulty.Repair: Repair the wire, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 5. Check the ECM
Temporarily install a new ECM. Refer to Troubleshooting, "Replacing the ECM".
Attempt to duplicate the original problem.Expected Result:The problem is resolved.Results:
OK - The original problem is resolved. Replacing the ECM solved the problem.STOP
Not OK - The original problem remains. Replacing the ECM did not resolve the problem.Repair: Reinstall the original ECM. Refer to Troubleshooting, "Replacing the ECM".Refer to Troubleshooting, "Inspecting Electrical Connectors".STOP