881544 Mariner SPRING

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
1076-8 Engine Fuel Injection Pump 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.
1076-9 Engine Fuel Injection Pump 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. 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 g03316988
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 g03316989
Location of the ECM connectors (typical front side engine view)
(1) Right rail connector
(2) J1/P1 ECM connector
(3) Control box connector to the power distribution panel
(4) Engine interface connector at the control box
Illustration 3 g03316990
Location of the connectors at the high-pressure fuel pump
(5) 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 g01318220
Terminal locations at the connector for the fuel control valve controller
(Terminal 1) Supply
(Terminal 5) Return
(Terminal 8) Keyswitch
(Terminal 11) Throttle control (PWM signal)
Illustration 8 g01428439
Terminal locations for the fuel system components at the harness connector
(Terminal 3) Keyswitch
(Terminal 5) Throttle control (PWM signal)
(Terminal 6) +Battery
(Terminal 7) −Battery
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 Cat ET. Check and record any dia