94050-12020 Honda NUT, FLANGE (12MM) (Honda Code 1816677).

Table 1
Diagnostic Codes Table    
Description    Conditions which Generate this Code    System Response    
E233(3) Low Engine Pre-Lube Pressure     The prelubrication pressure is outside the expected pressure for the programmed delay time.     The code is logged.
The alarm output is activated.
The engine is prohibited from being started.
The Electronic Control Module (ECM) continues to energize the prelube pump relay.    
338-5 Engine Pre-Lube Pump Relay : Current Below Normal     While the output driver is off, the ECM detects an open in the circuit for the engine prelube solenoid for more than five seconds.     The code is logged.
The alarm output is activated.    
338-6 Engine Pre-Lube Pump Relay : Current Above Normal     While the output driver is on, the ECM detects a short in the circuit for the engine prelube solenoid for more than five seconds.     The code is logged.
The alarm output is activated.
The output driver automatically resets and the output driver continues to try to activate the circuit component.    
339-5 Engine Pre-Lube Pressure Switch : Current Below Normal     The ECM detects an open in the circuit for the circuit for the manual prelubrication switch.     The code is logged.
The alarm output is activated.    Note: The prelubrication system is an option on these engines. If Caterpillar did not supply the prelube system, the electronic control for the prelube system is disabled. The above diagnostic and event codes are also disabled.If the "Engine Pre-Lube Time Out Period" parameter is programmed for a time period of zero seconds, the diagnostic and event codes that are mentioned above are disabled. The engine will crank without the prelubrication.In order for the prelube system to be enabled, the "Engine Pre-Lube Time Out Period" parameter must be programmed for 120 seconds or more.The prelube pump will not operate if the emergency stop button is activated or if the engine speed is greater than 0 rpm.During the prestart, the ECM will energize the prelube pump before cranking the engine in order to provide lubrication to the engine bearings. If the prelubrication of the engine is required, the ECM will provide +Battery voltage to the prelube relay. The prelube relay provides pressurized air or gas to the prelube pump motor. The prelube pump pressurizes the engine's lubrication system with oil. After activation, the prelube system will operate until one of the following occurrences:
Activation of the prelubrication pressure switch
Completion of the programmed "Engine Pre-lube Time Out Period"
Activation of the emergency stop buttonThe ECM monitors the prelubrication pressure switch in order to verify adequate lubrication of the engine prior to start-up. The pressure switch is normally open. The pressure switch closes when the prelube pump raises the engine oil pressure to 9 3 kPa (1.3 0.4 psi). When the pressure switch closes, sufficient oil pressure has been detected in order to initiate engine starting. After the pressure switch closes, the prelube pump continues to operate for a duration that is equal to the programmed "Engine Pre-Lube Time Out Period". The engine starting sequence continues when the engine prelube sequence is complete.If the ECM does not detect a signal from the pressure switch within the programmed period of time, the ECM monitors the engine oil pressure sensor in order to determine whether lubrication has occurred. If the prelubrication does not occur, an E233 Low Engine Pre-lube Pressure is generated. The starting sequence is terminated.The prelube pump can also be operated with a manual switch that can be installed by the customer as an option. When the switch is closed, a +Battery signal is sent to the ECM. The ECM provides +Battery voltage to the engine prelube solenoid until one of these conditions occur:
Activation of the prelubrication pressure switch
Deactivation of the manual prelube switch that can be installed by the customer as an option
Activation of the emergency stop buttonThe prelubrication system may also operate after shutdown. This ensures that the shaft bearings for the turbocharger have adequate lubrication during an engine shutdown. When the engine reaches 0 rpm, the output for the engine prelube solenoid may be energized for a period that is equal to the "Engine Post-Lube Duration" parameter setting. The postlube cycle can be disabled by setting the "Engine Post-Lube Duration" parameter setting to "0".The troubleshooting procedure may generate additional diagnostic codes. Continue troubleshooting the cause of the original diagnostic code. Clear the diagnostic codes after the problem is resolved.
Illustration 1 g01900313
Schematic of the prelubrication systemTest Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control to the OFF/RESET position.
Illustration 2 g01728480
Location of the components for the prelubrication system (1) ECM junction box (2) Engine junction box (3) Prelubrication pressure switch (4) Engine prelube solenoid (5) Prelube pump
Thoroughly inspect the mechanical condition of prelubrication pump (5) . Also, check the condition of the lines group from the air supply to the exhaust piping that is for the prelubrication system.
Illustration 3 g01728633
Locations of the connectors for the prelubrication system (typical left side engine view) (6) J2/P2 ECM connectors (7) J1/P1 ECM connectors (8) Control harness connector (9) Power harness connector
Illustration 4 g01728635
Locations of the components at the engine junction box that are associated with the prelubrication system (typical left side engine view) (10) Power harness connector (11) Engine interface connector (12) Interconnect harness connector
Thoroughly inspect the condition of the connectors for switch (3) and solenoid (4) . Inspect the condition of ECM connectors (6) and (7) . Also, thoroughly inspect the condition of connectors (8) , (9) , (10) , (11) , and (12) . Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 5 g01900353
Terminal locations on the P1 ECM connector for the prelubrication system (P1-30) Return (P1-19) Prelubrication pressure switch (P1-56) Manual prelube input