STEM ASSEM. (90 degrees) 2P6732 - Caterpillar

System Operation Description:The high pressure fuel pump contains two pressurizing assemblies. Assembly 1 is closest to the front of the engine. Each assembly contains a solenoid. The Engine Control Module (ECM) sends 105 volt pulses to each solenoid. The pulses are sent at the proper time and for the correct duration for a given engine load and speed.The ECM monitors the current flow through the circuit for each solenoid. If the current flow is too high or too low, the ECM activates one of the following diagnostic codes:
Table 1
Diagnostic Trouble Codes for the Circuits for the Solenoids in the High Pressure Fuel Pump    
J1939 Code    Description    Information    
1347-5     Engine Fuel Pump Pressurizing Assembly #1 : Current 2elow Normal     Current flow through the circuit for the solenoid is below the acceptable value. A snapshot is taken. The code is logged. The engine may shut down due to low fuel pressure. This code is disabled while the engine is cranking. The engine may not start due to low fuel pressure. The ECM will continue to fire the solenoid. If the ECM detects acceptable current flow during five successive attempts to fire the solenoid, the active code is cleared.    
1348-5     Engine Fuel Pump Pressurizing Assembly #2 : Current Below Normal    
1347-6     Engine Fuel Pump Pressurizing Assembly #1 : Current Above Normal     Current flow through the circuit for the solenoid is above the acceptable value. A snapshot is taken. The code is logged. The engine may shut down due to low fuel pressure. This code is disabled while the engine is cranking. The engine may not start due to low fuel pressure. The ECM will continue to fire the solenoid. If the ECM detects acceptable current flow during five successive attempts to fire the solenoid, the active code is cleared.    
1348-6     Engine Fuel Pump Pressurizing Assembly #2 : Current Above Normal    Note: The automatic cylinder cutout test is disabled while any of these codes are active.Automatic Configuration of the Solenoid DriversThe connectors for the solenoids are interchangeable. The ECM determines the connector that is connected to each solenoid during each engine start cycle. For this reason, you must determine the configuration of the wiring before you troubleshoot the system. This process is explained in the troubleshooting steps within this procedure.
Illustration 1 g01619437
Information for the high pressure fuel pump's electrical circuitsTest Step 1. Inspect the Electrical ConnectorsNote: Carefully following this procedure is a good way to identify an intermittent problem.
Perform a visual inspection of the wiring between the high pressure fuel pump and the ECM. Look for the following problems:
Harness damage that is caused by chafing
Harness damage that is caused by excessive heat
Inspect the wiring and the connectors at the high pressure fuel pump:
Look for moisture on the wiring and on the connectors.
Pull on each wire. This test verifies that the wire is properly crimped to the terminal and that the terminal is properly inserted into the connector.
Inspect the P2