346-62437-0 Tohatsu BUSHING, 10.2 - 12 - 29.5

Illustration 1 g00766789
Electronic Control System Components (left side view) (1) Grommet for injector harness (2) Injection Actuation Pressure Sensor (3) Air Inlet Heater Relay (Option 1) (4) Oil Temperature Sensor (5) Inlet Air Temperature Sensor (6) Atmospheric Pressure Sensor (7) Turbocharger Outlet Pressure Sensor (8) Air Inlet Heater Relay (Option 2) (9) Injection Actuation Pressure Control Valve (10) Engine Speed-Timing Sensors (11) Coolant Temperature Sensor (12) Oil Pressure Sensor (Option 1) (13) Oil Pressure Sensor (Option 2) (14) Fuel Pressure Sensor (Option 1) (15) Fuel Pressure Sensor (Option 2) (16) Electronic Control Module (17) Engine Harness Connector J2/P2The electronic control system is integrally designed into the engine's fuel system and the engine's air inlet and exhaust system in order to electronically control the fuel delivery and the injection timing. The electronic control system provides increased timing control and fuel air ratio control in comparison to conventional mechanical engines. Injection timing is achieved by the precise control of the injector firing time. Engine rpm is controlled by adjusting the injection duration. The Electronic Control Module (ECM) energizes the unit injector solenoids in order to start the injection of fuel. Also, the Electronic Control Module (ECM) de-energizes the unit injector solenoids in order to stop the injection of fuel. Refer to Systems Operation/Testing And Adjusting, "HEUI Injector Operation" for a complete explanation of the fuel injection process.The engine uses the following three types of electronic components:
Input component
Control component
Output componentAn input component is one that sends an electrical signal to the ECM of the system. The signal that is sent varies in either of the following ways:
Voltage
Frequency
Pulse widthThe variation of the signal is in response to a change in some specific system of the machine. Some specific examples of an input component are the engine speed-timing sensors and the coolant temperature sensor. The ECM interprets the signal from the input component as information about the condition, environment, or operation of the engine.A control component (ECM) receives the input signals from the input components. Electronic circuits inside the control component evaluate the signals from the input components. These electronic circuits also supply electrical energy to the output components of the system. The electrical energy that is supplied to the output components is based on predetermined combinations of input signal values.An output component is one that is operated by a control module. The output component receives electrical energy from the control group. The output component uses that electrical energy in one of two ways. The output component can use that electrical energy in order to perform work. The output component can use that electrical energy in order to provide information.As an example, a moving solenoid plunger will perform work. By performing work, the component has functioned in order to regulate the machine.As an example, a dash panel light or an alarm will provide information to the operator of the machine.These electronic components provide the ability to electronically control the engine operation. Engines with electronic controls offer the following advantages:
Improvement in performance
Improvement in fuel consumption
Reduction in emissions levels
Table 1
Electrical Connectors And Functions    
J/P Number     Function    
J1/P1     ECM Connector (70 pin, OEM Harness Connector)    
J2/P2     ECM Connector (70 pin, Engine Harness Connector)    
J61     Customer Connector    
J63     Engine Service Tool Connector    
J100/P100     Coolant Temperature Sensor Connector (2 pin)    
J103/P103     Inlet Manifold Air Temperature Sensor Connector (2 Pin)    
J200/P200     Turbocharger Outlet Pressure Sensor Connector (3 pin)    
J201/P201     Engine Oil Pressure Sensor    
J203/P203     Atmospheric Pressure Sensor Connector (3 pin)    
J204/P204     Injection Actuation Pressure Sensor Connector (3 pin)    
J209/P209     Fuel Pressure Sensor    
J300/P300     Unit Injector Connector (12 pin)    
J301/P301     No. 1 Unit Injector Connector (2 pin)    
J302/P302     No. 2 Unit Injector Connector (2 pin)    
J303/P303     No. 3 Unit Injector Connector (2 pin)    
J304/P304     No. 4 Unit Injector Connector (2 pin)    
J305/P305     No. 5 Unit Injector Connector (2 pin)    
J306/P306     No. 6 Unit Injector Connector (2 pin)    
J400/P400     Engine Timing Calibration Probe (2 pin)    
J401/P401     Primary Engine Speed-Timing Sensor Connector (2 pin)    
J402/P402     Secondary Engine Speed-Timing Sensor Connector (2 pin)    
J403/P403     Throttle Position Connector (3 pin)    
J500/P500     Injection Actuation Pressure Control Valve Connector (2 pin)    
J501/P501     Air Inlet Heater Relay Connector (2 pin)    
J800/P800     Coolant Level Sensor    
Table 2
Diagnostic Flash Codes    
Flash Code    CID-FMI    SPN-FMI    Description of Code    
15     164-02     164-02     Injection Actuation Pressure Sensor Loss of signal    
164-03 164-03     Injection Actuation Pressure open/short to +batt    
164-04 164-04     Injection Actuation Pressure open/short to ground    
17     164-00     164-00     High Injector Actuation Pressure    
18     042-11     N/A     Injection Actuation Pressure Control Valve Operator open/short    
21     262-03     620-03     5 Volt Sensor DC Power Supply short to +batt    
262-04