56777 Mercruiser SPACER, MOUNTING BRACKET SCREW (1")

Table 1
J1939 Code and Description CDL Code and Description Comments
3029-31
Engine start inhibited, pre-lube system issue E233(3)
Low Engine Pre-Lube Pressure 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.
3551-1
Engine Oil Priming State : Low - most severe (3) E233(3)
Low Engine Pre-Lube Pressure If a 3551-1 code is active, the ECM did not detect the minimum pressure during the engine prelube sequence for 3 consecutive start attempts. After starting, the engine should not be shutdown until a repair or replacement can be performed so that the engine is not repeatedly started without a proper functioning prelube system.
3551-17
Engine Oil Priming State : Low - least severe (1) E233(1)
Low Engine Pre-Lube Pressure If a 3551-17 code is active, the ECM did not detect the minimum pressure during the engine prelube sequence. Probable Causes
Codes
Oil level
Lines
Power
PumpRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A 3029 code is present.
Proceed to Test Step 2.
2. Check the Engine Oil Level
Oil Level
Result: The engine oil is not low.
Proceed to Test Step 3.
Result: The engine oil level is low.
Repair: Perform the following procedure:
1. Add engine oil. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.
2. Start the engine. Inspect the exterior of the engine for oil leaks. Repair any oil leaks.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Suction and Discharge Lines of the Prelube Pump
A. Ensure that valves are open, fittings are tight, and that O-rings are not damaged.
Lines
Result: Pump lines, fittings, and O-rings are not damaged and properly working.
Proceed to Test Step 4.
Result: Pump lines, fittings and/or O-rings are damaged and not properly working.
Repair: Repair or replace damaged pump lines fittings and/or O-rings.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Electrical Power to the Prelube Pump Motor
A. Apply electrical power to the engine.
B. Use the following override in Cat ET:
- Prelubrication Relay Override
C. Measure the voltage at the prelubrication pump connector. Refer to the appropriate wiring schematic.
Power
Result: There is system voltage at the prelubrication pump connector.
Proceed to Test Step 5.
Result: The prelubrication pump voltage is NOT equal to system voltage.
There is a problem with the power supply to the prelubrication pump. Check the power supply, circuit protection device, and the relay.
If the problem is not resolved, proceed to Test Step 5.
5. Check for Inadequate Prelubrication Pump Pressure
A. Connect Cat ET.
B. Use Cat ET to monitor the following parameter during the prelube cycle:
- "Engine Oil Pressure"
Note: 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: Loosen a fitting in the pump discharge line near the pump. Loosening a fitting allows air to vent from the line. If oil is detected, tighten the fitting to prevent leaks and monitor the engine oil pressure.
Repair: Repair or replace damaged prelubrication pump.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).