TUBE 4923912 - Caterpillar

The following background information is related to this procedure:Suction Control Valve (SCV) for the High-Pressure Fuel PumpThe high-pressure fuel pump is equipped with a suction control valve. The suction control valve precisely controls the amount of fuel that enters the high-pressure fuel pump.The amount of fuel that is required is calculated by the software that is contained in the ECM. The solenoid in the suction control valve is controlled by a PWM signal from the ECM.
Illustration 1 g03840648
Schematic for the suction control valve solenoid
Illustration 2 g03841114
Typical example of the high-pressure fuel pump
(1) Solenoid for the Suction Control Valve (SCV)
Illustration 3 g03841117
Connector for the SCV solenoid
(1) Signal
(2) Return
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P1/J1 ECM connector and the SCV solenoid. Refer to Troubleshooting, "Electrical Connectors - Inspect".
B. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the active diagnostic code.
C. Perform a 45 N (10 lb) pull test on each of the wires in the solenoid connectors that are associated with the active diagnostic code.
D. Check the harness for corrosion, abrasion, and pinch points from the solenoids to the ECM.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Turn the keyswitch