906632 Volvo.Penta Nut

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.    
91-8 Throttle Position Sensor abnormal frequency, pulse width, or period     The Electronic Control Module (ECM) detects an incorrect frequency on the throttle signal or an incorrect duty cycle on the throttle signal. The frequency is below 150 Hz or the frequency in above 1000 Hz. The duty cycle is less than 5 percent or the duty cycle is greater than 95 percent.
This code is used when the parameter for the "Desired Speed Input Configuration" is configured to "PWM".     The code is logged. The ECM flags the throttle position as invalid data and a default value of zero percent is used. The engine speed is limited to high idle.    
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.     Engine will be unable to build rail pressure    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 Caterpillar 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.
Illustration 1 g03205016
Schematic of the PWM signal for the high-pressure fuel pumpNote: 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 g03332843
Location of the connectors at the control box that are for the fuel control (typical top front engine view) (1) Right rail connector (2) J1/P1 ECM connector (3) J2/P2 ECM connector
Illustration 3 g03332851
Location of the connectors at the high-pressure fuel pump (4) Connector for the fuel control valve electronic controller
Illustration 4 g01318105
Terminal locations for the high-pressure fuel pump at the P1 ECM connectors (P1-38) Throttle control (PWM signal) (P1-70) Keyswitch
Illustration 5 g02453085
Terminal locations for the high-pressure fuel pump at the P2 ECM connectors (P2-6) Filtered +Battery
Illustration 6 g01477832
Terminal locations for the high-pressure fuel pump at the right rail connectors (Terminal 16) Filtered +Battery from the ECM (Terminal 17) Return circuit from −Battery (Terminal 48) PWM signal (Terminal 70) Keyswitch
Illustration 7 g01478322
Terminal locations at the harness connector for the fuel system components (Terminal 2) Filtered +Battery from the ECM (Terminal 3) Return circuit from −Battery (Terminal 8) Keyswitch (Terminal 9) PWM signal
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for an Active Diagnostic Code
A. Connect Cat ET to the service tool connector.
B. Restore the electrical power to the ECM.
C. Monitor the diagnostic codes on Ca