0321174 JOHNSON RETAINER PLATE,Brg. hsg

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
18-8
Fuel Control Valve : Abnormal Frequency, Pulse Width, or Period The controller for the fuel control valve has detected an error at the input for the Pulse Width Modulated signal (PWM signal). The problem is communicated to the Electronic Control Module (ECM) via the CAN data link. Control for the fuel control valve reverts to the CAN data link.
18-9
Fuel Control Valve : Abnormal Update Rate The engine ECM did not receive the expected data link information from the controller for the fuel control valve. The fuel control valve utilizes the PWM signal for fuel control.
18-14
Fuel Control Valve : Special Instruction At startup, the ECM detected a mismatch between the engine software and the fuel control valve hardware vintage, or there is a loss of communication with the fuel control valve. The check engine lamp is illuminated.
1028-6
Power Supply Control 1 : Current Above Normal The ECM output which powers the Fuel Control Valve has detected a short to ground in the wiring or an internal fault with the fuel control valve. A failed power supply to the FCV has been detected. This engine is equipped with a high pressure common rail fuel system. The fuel pressure for the high pressure common rail fuel system is generated by the high-pressure fuel pump. Pressure regulation for the high-pressure fuel pump is provided by the fuel control valve. The fuel control valve is a mechanical valve that is part of the high-pressure fuel pump. The valve regulates the fuel pressure that is produced by the pump by controlling the volume of fuel that enters the pump. The valve is controlled by an electrical actuator. Control for the actuator is provided by an electronic controller that is a part of the actuator.The engine ECM communicates a desired throttle position to the fuel control valve controller in the form of a PWM signal. The PWM signal is generated by a signal driver at the ECM and the signal is sent to the controller for the fuel control valve.Note: The desired throttle position is also communicated via the CAN data link as a throttle backup control.The PWM signal that is used for the desired throttle position has a constant frequency of 500 Hz. At low engine idle, the signal will have a duty cycle of approximately 10 percent. At high engine idle with no load on the engine, the signal will have a duty cycle of approximately 20 to 25 percent. At high engine idle with a full load on the engine, the signal will have a duty cycle of approximately 50 to 60 percent.The desired throttle position can be viewed on Cat® Electronic Technician (ET). View the status of the "Fuel Actuator Position Command" parameter in order to determine the desired throttle position of the engine. At low engine idle, the "Fuel Actuator Position Command" will be approximately 10 to 15 percent. At high engine idle with no load on the engine, the "Fuel Actuator Position Command" will be approximately 20 to 25 percent. At high engine idle with a full load on the engine, the "Fuel Actuator Position Command" will be approximately 40 to 50 percent.A power module is used to supply electrical power to the controller for the fuel control valve. The power module is used to convert battery voltage (24 VDC) to 14.0 1.5 VDC that is used by the controller. There is a 15 amp fuse that is for the power module in the cab of the machine.
Illustration 1 g01605873
Schematic of the PWM signal for the high-pressure fuel pump
Note: For a schematic and troubleshooting information that is related to the throttle backup control and the CAN data link, refer to Troubleshooting, "Data Link - Test".
Illustration 2 g01854341
Fuse panel that is in the cab of the machine
(1) 10 amp fuse for the keyswitch
(2) 15 amp fuse for power to the power module
Illustration 3 g01619826
Location of the ECM connectors (typical left side engine view)
(3) J1/P1 ECM connector
(4) Right rail connector
(5) Left rail connector
Illustration 4 g01619831
Location of the machine interface connectors (typical left rear engine view)
(6) Machine interface connector
Illustration 5 g01620870
Location of the connectors at the high-pressure fuel pump
(7) Connector for the fuel control valve electronic controller
(8) Connectors at the power module
Illustration 6 g01620871
Location of the interface connector at the cab of the machine for the fuel control
(9) Interface connector at the cab of the machine
Illustration 7 g01318105
Terminal locations for the high-pressure fuel pump at the P1 ECM connectors
(P1-38) Throttle control (PWM signal)
(P1-70) Keyswitch
Illustration 8 g01428435
Terminal locations for the high-pressure fuel pump at the right rail connectors
(Terminal 18) Keyswitch
(Terminal 31) −Battery
(Terminal 51) Throttle control (PWM signal)
(Terminal 54) +Battery