CAP 8G0966 - Caterpillar

Shutoff
The engine shuts off by preventing the electronic unit injectors from injecting. The ECM then closes the suction control valve to prevent the pressure in the fuel manifold (rail) from increasing.Control
Illustration 6 g06253942
C7.1 Propulsion Engine Electronic System
(1) A5E2V2 Engine Control Module
(2) Cat ET Service Tool
(3) SAE J1939 (CAN)/CDL Data Bus
(4) Starter Relay
(5) Starter Motor
(6) CAN Bus Terminator or Trolling Mode Processor Connector
(7) +ve Glow Plug Relay
(8) Glow Plugs Case Ground
(9) -ve Glow Plug Relay
(10) Alternator Charging Relay Input
(11) 430-9454 Coolant Level Sensor
(12) 416-2211 Exhaust Gas Temperature Sensor (Opt)
(13) Customer Interface Connector
(14) MPD/SAE J1939 CAN Data Bus Transmission/Vessel
(15) Power Supply (12V/24V)
(16) Primary Throttle (PWM)
(17) Secondary Throttle (PWM)
(18) Warning Lamp
(19) Diagnostic Lamp
(20) Maintenance Lamp
(21) Low Coolant Level Lamp
(22) Low Oil Pressure Lamp
(23) High Coolant Temperature Lamp
(24) Water in Fuel Lamp
(25) Ignition Switch
(26) Remote Shutdown Switch
(27) Troll Mode Switch
(28) Throttle Synchronize 1 Switch
(29) Throttle Synchronize 2 Switch
(30) Trip Clear Switch
(31) Slow Vessel Mode
(32) 349-7378 Fuel Supply Pressure Sensor (Opt) (1200 kPA)
(33) 423-6434 Water in Fuel Sensor (Opt)
(34) 320-3064 Transmission Oil Pressure Sensor (Opt) (3500 kPA)
(35) 398-5399 Raw Water Pressure Sensor (Opt)
(36) 238-0112 Transmission Oil Temperature Sensor (Opt)
(37) 337-3905 Fuel Temperature Sensor (Built into Fuel Rail Pump)
(38) 274-6721 Return Fuel Pressure Sensor (882 kPA)
(39) 327-8803 Fuel Rail Pressure Sensor
(40) 320-3062 Intake Manifold Air Pressure Sensor (400 kPA)
(41) 288-3783 Intake manifold Air Temperature Sensor
(42) 256-6454 Coolant Temperature Sensor
(43) 320-3060 Oil Pressure Sensor
(44) 238-0120 Crankshaft Speed/Timing Sensor
(45) 238-0120 Camshaft Speed/Timing Sensor
(46) 446-5412 Fuel Lift Pump (12V), 446-5413 Fuel Lift Pump (24V)
(47) Fuel Rail Pump Actuator
(48) Fuel Injectors #1-6
(49) Fuel Lift Pump Relay
(50) Maintenance Check SwitchThe ECM determines the quantity, timing, and pressure of the fuel to be injected into the fuel injector.The ECM uses input from the sensors on the engine. These sensors include the speed/timing sensors and the pressure sensors.The ECM controls the timing and the flow of fuel by actuating the injector solenoid.The amount of fuel is proportional to the duration of the signal to the injector solenoid.The ECM controls the fuel pressure by increasing or decreasing the flow of fuel from the fuel injection pump.Fuel Injectors
Illustration 7 g03880094
(1) Electrical Connections
(2) Bolt
(3) Clamp
(4) Combustion Washer
(5) O-Ring
(6) Fuel inlet
(X) Injector CodeNote: If a replacement electronic injector is installed, the correct injector code must be programmed into the electronic control module. Refer to Troubleshooting, "Injector Code - Calibrate" for more information. The code that is required is at Position (X). Record Code (X) before the electronic unit injector is installed.The fuel injectors contain no serviceable parts apart from the O-ring seal and the combustion washer. The clamp and setscrew are serviced separately.When the ECM sends a signal to the injector solenoid, a valve inside the injector opens. The valve allows the high-pressure fuel from the fuel manifold to enter the injector. Fuel is also diverted via the leak-off route to cool and lubricate injector. The pressure of the fuel pushes the needle valve and a spring. The difference