346B05101-1 Tohatsu STARTER BRACKET

Probable Causes
Selected engine rating parameters
The connectors on the Electronic Control Module (ECM)
Electronic unit injector connector
Low injection actuation pressure
Faulty remote shutdown
Diagnostic codes
Fuel supply
Faulty overspeed verify switchNote: If the problem only occurs under certain conditions such as high engine speed, full load or engine operating temperature, then perform the test under those operating conditions.Recommended Actions
Selected Engine Rating Parameters
The engine may be shut down due to low pressure levels or other factors. Connect Caterpillar Electronic Technician (ET) and check for active shutdowns or diagnostic codes.If a shutdown is active, "injection disabled" will appear in the third box of engine status on anyCat ET status screen.An engine shutdown event will appear on a CAN J1939 device if the device is capable of displaying diagnostic codes.Electrical Connections to the ECM
Check the associated wiring for the following conditions: damage, abrasion and corrosion. Inspect the following connectors: ECM connector, customer connector and engine speed/timing sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for additional information.
Check Cat ET for the CID 168-FMI 02 diagnostic code.Check the battery connection at the customer connector and the ECM connector. Refer to the electrical schematic. Perform a pull test on the associated wiring. Refer to Troubleshooting, " Electrical Connectors-Inspect".
The problem may occur when the engine is warmed up. Then as the engine cools, the problem may disappear. The circuit breakers may be exceeding the trip point because of the overheating. Check the circuit breakers. Reset the circuit breakers.
Aftermarket engine protection devices usually interrupt power to the ECM. Check for correct installation and operation of aftermarket engine protection devices. It may be necessary to bypass aftermarket devices in order to continue testing.Electronic Unit Injector Connector
Check the unit injector connectors and associated wiring for the following conditions: damage, abrasion, corrosion and incorrect attachment. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.Low Injection Actuation Pressure
Check the engine oil level. Engine oil is used to activate the high pressure hydraulic pump.
Ensure that the engine oil meets the recommendations of the Operation and Maintenance Manual.
Crank the engine and monitor the injection actuation pressure and the output of the injection actuation pressure control valve. The high pressure oil system is operating properly if the pressure output is a minimum of 6 MPa (870 psi).
Connect the electronic service tool and check for the CID 164-FMI 11 diagnostic code.If this diagnostic code has been logged recently, refer to Troubleshooting, "Injection Actuation Pressure System-Test".Diagnostic Codes
The ECM detects an engine speed that is greater than 2500 rpm. Check Cat ET for diagnostic codes.Refer to the appropriate functional test.Fuel Supply
Check for a problem with the fuel supply and verify the fuel pressure. Verify that the fuel pressure sensor is installed. Refer to Testing and Adjusting, "Fuel System" for additional information.Remote Shutdown Switch
Access the Cat ET screen that displays the Remote Shutdown Switch status. The remote shutdown switch status on Cat ET is called "User Shutdown".
Table 1
"User Shutdown Status"     Switch Status     Measured Voltage at P61:27    
ON     Negative battery     <0.9 VDC    
OFF     Open Circuit     >10 VDC    If the voltage is not in the proper range, refer to Troubleshooting, "Remote Shutdown Switch Circuit - Test".Faulty Overspeed Verify Switch
If any overspeed verify condition has occurred, the air shutoff solenoid(s) must be reset manually. Remove the wire for the overspeed verify switch and test the shutoff again. If the problem goes away, there is a problem in the circuit for the overspeed verify switch. Refer to Troubleshooting, "Overspeed Verify Switch Circuit - Test".