31240-ZW1-004 Honda SWITCH ASSY., MAGNET (Honda Code 4914693).

Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
1390-15
Engine Fuel Valve #1 Inlet Absolute Pressure : High - least severe (1) The fuel pressure has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
1390-17
Engine Fuel Valve #1 Inlet Absolute Pressure : Low - least severe (1) The fuel pressure has fallen below the trip point for the programmed delay time. Probable Causes
Incorrect gas pressure
Faulty gas pressure regulatorRecommended 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 Active Codes and Logged Codes
A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Monitor the diagnostic codes on Cat ET. Check for active or logged diagnostic codes. Specifically check for codes that could be associated to a fuel pressure problem.
Note: Wait at least 30 seconds in order for diagnostic codes to become active.
Codes
Result: A code is active or logged.
Repair: Troubleshoot any codes before continuing with this procedure.
Verify that the repair eliminated the problem.
Result: A code is not active or logged.
Proceed to Test Step 2.
2. Check the Fuel Pressure Sensor
A. Record the fuel pressure from Cat ET.
Use a mechanical gauge to check the system fuel pressure. Refer to Systems Operation/Testing and Adjusting, "Fuel Pressure (Gas System)" for additional information.
B. Record the fuel pressure on the pressure gauge.
Note: If a mechanical gauge is not available, determine if the fuel pressure reading on Cat ET is reasonable.
Fuel Pressure Sensor
Result: The gauge value of the fuel pressure is reasonable when compared to the fuel pressure reading shown in ET.
Proceed to Test Step 3.
Result: The gauge value of the fuel pressure is not reasonable when compared to the fuel pressure reading shown in ET.
Repair: Replace the pressure sensor. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.
Verify that the repair eliminated the problem.
3. Inspect the Gas Supply Line
A. Visually inspect the gas supply line. Also, inspect the gas cooler. Inspect the lines for restrictions, pinching, and swelling.
Restrictions, Pinching, and Swelling
Result: The fuel lines and the cooler are OK.
Proceed to Test Step 4.
Result: The fuel lines and the cooler are NOT OK.
Repair: Make the necessary repairs. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.
Verify that the repair eliminated the problem.
4. Adjust the Gas Pressure Regulator
A. Adjust the gas pressure regulator. Refer to Systems Operation/Testing and Adjusting, "Fuel Pressure (Gas System)".
10.3 to 24.1 kPa or 1.5 to 3.5 psig
Result: The gas pressure is OK.
Proceed to Test Step 5.
Result: The gas pressure is NOT OK.
Repair: Make the necessary adjustments. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.
Verify that the repair eliminated the problem.
5. Replace the Return Gas Pressure Regulator
Gas Pressure Regulator
Result: Repair or replace as necessary. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.
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).