VALVE GP-CONTROL 3203632 - Caterpillar

Table 1
Event Code    
J1939 Code and Description    Conditions which Generate this Code    System Response    
3029-31 Engine start inhibited, pre-lube system issue     The Electronic Control Module (ECM) did not detect the minimum pressure for the programmed duration that is for the engine prelube sequence.     The code is logged.
The engine is not allowed to start.    Probable Causes
Engine oil level
Electrical power to the prelube pump motor
Inadequate prelubrication pressureRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Product Status Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine if the event code that directed to this story is present.
D. Look for active diagnostic codes that are associated with the system for the event code that directed to this story.
   
3029-31
   
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A 3029-31 code is present.
Proceed to the next step.
Result: No active codes
STOP
   
2. Check the Engine Oil Level
   
Level
   
Result: The engine oil is not low.
Proceed to the next step.
Result: The engine oil level is low.
Repair: Add engine oil in order to obtain the correct engine oil level.
Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.
Start the engine. Inspect the exterior of the engine for oil leaks. Repair any oil leaks.
If the problem is not resolved, proceed to the next step.
   
3. Check the Electrical Power to the Prelube Pump Motor
A. Ensure that the prelube pump motor is wired correctly.
Refer to Troubleshooting, "Prelubrication - Test" for information that is related to the pump circuit.
   
Power
   
Result: The pump is powered when called for.
Proceed to the next step.
Result: The pump is not receiving power when called for.
Repair: Repair or replace the faulty circuit component.
If the problem is not resolved, proceed to the next step.
   
4. Check for Inadequate Prelubrication Pressure
A. Monitor the following parameter during the prelube cycle:
"Engine Oil Pressure (abs)"
The ECM must detect an oil pressure of
41 kPa (6 psi) for the programmed "Engine Ready to Start Prelube Duration" before the engine is cranked.
   
Pressure
   
Result: The pressure is NOT OK.
Repair: Repair the pump or replace the pump.