SEAT GP 4940059 - Caterpillar

Table 1
Diagnostic Trouble Codes
J1939 Code and Description Comments
1239-0
Engine Fuel Leakage 1 : Data High - Most Severe (3) The fuel rail pressure is below an acceptable level.
The code is logged.
1239-31
Engine Fuel Leakage 1 : Condition Exists Condition Exists
Table 2
Associated Diagnostic Trouble Codes
J1939 Code Code Description
157-17 Engine Injector Metering Rail #1 Pressure : Data Low - Least Severe (1)
5580-18 Engine Filtered Fuel Delivery Absolute Pressure : Data Low - Moderately Severe (2)
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Codes
A. Establish communication between Caterpillar® Electronic Technician (Cat ET) and the Engine Electronic Control Module (ECM).
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. If any of the associated codes in Table 2 are logged, troubleshoot the codes before continuing with this procedure.
Associated Codes
Result: An associated code is not active or logged.
Proceed to Test Step 2.
Result: An associated code is active or logged.
Repair: Troubleshoot the associated codes before continuing with this procedure.
If the problem is not resolved, proceed to Test Step 2.
2. Inspect the Fuel System
A. Inspect the fuel system. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect" for inspection of the high-pressure fuel lines and the fuel rail.
Fuel System Problems
Result: Problems were not found with the fuel system.
Proceed to Test Step 3.
Result: Problems were found with the fuel system.
Repair: Repair the components or replace the components that are damaged. Verify that the problem is resolved.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Fuel Rail Sensor
A. Allow the engine to be OFF for 10 minutes.
B. Turn the keyswitch to the ON position, do not start the engine.
C. Connect to the Engine ECM using Cat ET.
D. Using Cat ET, check the status of the "Fuel Rail Pressure (absolute)".
Rail Pressure less than 5,000 kPa (725 psi) Result: The pressure dropped below 5,000 kPa (725 psi) after the engine was shut off for 10 minutes.
Proceed to Test Step 4.
Result: The pressure did not drop below 5,000 kPa (725 psi) after the engine was shut off for 10 minutes.
Repair: Replace the fuel rail pressure sensor. If the problem has been corrected, return the unit to service.
If the problem is not resolved, proceed to Test Step 4.
Illustration 1 g03814419
Location of the "Fuel System Functional Test" in the "Diagnostic Service Test" menu
Illustration 2 g03383456
If a 1239-0 Low Fuel Rail Pressure fault is active, the "Fuel System Functional