850296T 4 Mercury COVER

Table 1
J1939 Code and Description CDL Code and Description Comments
157-7
Engine Injector Metering Rail #1 Pressure : Not Responding Properly E1069 (1)
Fuel Rail #1 Pressure Not Responding The engine fuel rail pressure sensor reading is unstable or incorrect.
1239–0
Engine Fuel Leakage 1 : Data High - Most Severe (3) E499 (3)
Fuel Rail #1 Pressure Leak There is a probable fuel leak from the high-pressure fuel system. The amount of leakage is a calculated parameter.
The code is logged.
The engine will stop.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
1076-7 18-7 The actual position and the desired position of the fuel actuator is not within specifications. Replace the fuel control valve.
1381-17 E2172 (1) Troubleshooting, "Fuel Transfer Pump Inlet Pressure Is Low" Probable Causes
Codes
Air in fuel
Relief ValveRecommended Actions
Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Table 3
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Apply electrical power to the engine.
B. Connect Cat® Electronic Technician (ET) to the service tool connector.
C. Look for active codes that are associated with the system for the event code.
Diagnostic codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check for Air in the Fuel
A. Refer to Testing and Adjusting, "Air in Fuel" for additional information.
Air in Fuel
Result: There was NOT air in the fuel.
Proceed to Test Step 3.
Result: There was air in the fuel.
Repair: Determine the cause of the air in the fuel. Repair as necessary.
If the problem is not resolved, proceed to Test Step 4.
Illustration 1 g06089463
High-Pressure Fuel Pump
(1) Pump head
(2) Valve block
Table 4
3. Check the Fuel Pressure Relief Valve
A. Start the engine and allow the engine to run until operating temperature is reached.
B. Run the engine at high idle.
C. Use a 349-4203 Infrared Thermometer to measure the temperature difference between valve block (2) and pump head (1).
Temperature
Result: The temperature difference is less than 40° C (72° F).
A failed fuel rail pressure sensor has been detected.
Repair: Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel.
Verify the "Fuel Rail Pressure" reading in ET is 0 8 MPa (0 1160 psi) prior to servicing the fuel system.
Replace the fuel rail pressure sensor.
Result: The temperature difference is more than 40° C (72° F).
A failed high-pressure fuel pump has been detected.
Repair: Replace the high-pressure fuel pump.
If the problem is not resolved, proceed to Test Step 4.
4. Check for Diagnostic Codes
A. Start the engine and allow the engine to run until operating temperature is reached.
B. Look for active or logged diagnostic codes.
Codes
Result: No codes present.
Return to service.
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).