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Table 1
Diagnostic Codes Table    
Code and Description     Conditions which Generate this Code     System Response    
338-5 Engine Pre-Lube Pump Relay current below normal     The engine's Electronic Control Module (ECM) detects an open circuit at the output for the solenoid in the prelube system.
The ECM detects a short to battery voltage at the output for the solenoid in the prelube system.
The ECM can only detect this condition when the output is not energized.     The code is logged.    
338-6 Engine Pre-Lube Pump Relay current above normal     The ECM detects a short circuit at the output for the solenoid in the prelube system.
The ECM can only detect this condition when the output is energized.    The ECM has the ability to automatically prelube the engine before cranking. This prelubrication may increase the life of certain engine parts. The ECM will prelube the engine, when the keyswitch is placed in the START position. The length of time for the prelube cycle must be programmed by the customer. The prelube cycle will end when the customer programmed time ends. The following conditions must be true in order for the prelube cycle to activate.
The engine speed must equal zero rpm.
The parking brake must be engaged.
The length of time for the prelube cycle must be greater than zero.The prelube cycle has the following status codes."OFF" - The ECM is powered and the keyswitch is in the STOP position."ON" - The ECM is powered and the keyswitch is in the START position."COMPLETED" - The prelube has timed out."DISABLED" - The engine prelube duration is programmed to 0.An override on Caterpillar Electronic Technician (ET) allows the technician to activate the prelube system. The override is functional when the engine speed is 0 rpm. The override is accessed by selecting the following menus on Cat ET:
Diagnostics
Diagnostic tests
Override parameters
Illustration 1 g01418373
Schematic for the prelube systemTest Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 2 g01415758
Location of ECM connectors
Thoroughly inspect the J1/P1 ECM connectors. Inspect all of the other connectors that are in the circuit for the prelube system. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01418375
P1 ECM connector (P1-13) "Prelube solenoid" (P1-18) Solenoid return
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw on each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Select diagnostic tests from Cat ET.
Select the "Override Parameters" screen on Cat ET.
Activate the prelube override.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic code to become active.
Disable the prelube override.
Determine if the problem is related to an open circuit diagnostic code -5 or a short circuit diagnostic code -6.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: The problem may have been related to a faulty connection in the harness. Carefully inspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A short circuit diagnostic code -6 is active at this time. Proceed to Test Step 3.
Not OK - An open circuit diagnostic code -5 is active at this time. Proceed to Test Step 4.Test Step 3. Disconnect the Connector for the Solenoid in the Prelube System in Order to Create an Open Circuit
Turn the keyswitch to the OFF position.
Disconnect the solenoid for the prelube system.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Select diagnostic tests from Cat ET.
Select the "Override Parameters" screen on Cat ET.
Activate the prelube override.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic code to become active.
Disable the prelube override.Expected Result:An open circuit diagnostic code -5 is now active for the solenoid.Results:
OK - A short circuit diagnostic code -6 was active before disconnecting the connector. An open circuit diagnostic code -5 became active after disconnecting the connector.Repair: Temporarily connect a new solenoid to the harness, but do not install the new solenoid. Verify that there are no active diagnostic codes for the solenoid. If there are no active diagnostic codes for the solenoid, permanently install the new solenoid. Clear any logged diagnostic codes.STOP
Not OK - A short circuit diagnostic code -6 remains active when the solenoid for the prelube system is disconnected. There is a short circuit between the harness connector for the solenoid and the ECM. Proceed to Test Step 5.Test Step 4. Create a Short at the Connector for the Solenoid in the Prelube System
Turn the keyswitch to the OFF position.
Fabricate a jumper wire that is long enough to create a short between the terminals of the connector for the solenoid. Crimp connector pins to each end of the jumper wire.
Install the jumper wire between terminal 1 (solenoid) and terminal 2 (solenoid return) on the