Fuel Differential Pressure Is Low
Use this procedure to troubleshoot the following event code.
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| J1939 Code and Description | Comments |
|---|---|
| 1391-17
Engine Fuel Valve Differential Pressure : Low - least severe (1) |
The difference in fuel pressure between the inlet and the outlet of the fuel metering valve is less than the trip point. The delay time has expired.
The alarm output is activated. The code is logged. |
| 1391-1
Engine Fuel Valve Differential Pressure : Low - most severe (3) |
The difference in fuel pressure between the inlet and the outlet of the fuel metering valve is less than the trip point. The delay time has expired.
The alarm output is activated. The code is logged. |
Note: Refer to Troubleshooting, "Engine Monitoring System" for information on trip points and delay times.
- Improper installation of the fuel metering valve
- Obstructed fuel outlet
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| 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 1391-17 code is active or logged. Proceed to Test Step 2. |
2. Check the Installation of the Fuel Metering Valve A. Determine if the fuel metering valve is installed in the correct direction. |
Direction |
Result: The valve is installed correctly. Proceed to Test Step 3. The valve is NOT installed in the correct direction. Repair: Reverse the valves direction. |
3. Check the Fuel Outlet for Obstructions A. Inspect the piping that is between the fuel metering valve and the inlet to the turbocharger compressor. Look for obstructions. |
Obstruction |
Result: There was an obstruction. Repair: Remedy the cause of the obstruction. |
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