C175 Oil&Gas Offshore Engine Caterpillar

Fuel Rail Pressure Is High

Usage:

Use this procedure to troubleshoot a high fuel rail pressure. Also, or use this procedure if the following event code is active.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
157–15 Engine Injector Metering Rail #1 Pressure : Data High - Least Severe (1)	E396(1) High Fuel Rail Pressure - least severe (1)	The fuel rail pressure is above the trip point pressure for the programmed delay time. The code is logged.

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Table 2
Associated Codes
J1939 Codes	CDL Codes	Troubleshooting Procedure
1067–7	18–7	Troubleshooting, Fuel Control - Test
1076–7	18–8	Troubleshooting, Fuel Control - Test
1076–11	18–11	Troubleshooting, Fuel Control - Test
1076–12	18–12	Troubleshooting, Fuel Control - Test
3597–6	1028–6	Troubleshooting, Fuel Control - Test

Probable Causes

Fuel rail pressure sensor

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Download the "Product Status Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes. C. Determine if the diagnostic trouble code that directed to this procedure is present. D. Look for active diagnostic codes that are associated with the system for the event code that directed to this procedure.	E396	Result: An associated code is present. Repair: Troubleshoot any associated codes before continuing with this test. Result: An E396 code is present. Proceed to the next step. Result: No active codes STOP
2. Check the Fuel Rail Pressure Sensor A. Turn the keyswitch to "OFF". B. Allow the engine to sit for 10 minutes. C. Turn the keyswitch to "ON". D. Connect Cat ET to the service tool connector. E. Monitor the "Fuel Rail Pressure".	Rail Pressure	Result: The fuel rail pressure is less than 5000 kPa (725 psi) after 10 minutes. Proceed to Test Step 4. Result: The fuel rail pressure is greater than 5000 kPa (725 psi) after 10 minutes. Proceed to Test Step 3.
3. Check the Fuel Rail Pressure Sensor A. Turn the keyswitch to "ON". B. Vent the pressure from the fuel system. Refer to Testing and Adjusting, "Fuel Rail Pressure – Release". C. Turn the keyswitch to "ON". D. Connect Cat ET to the service tool connector. E. Monitor the "Fuel Rail Pressure".	Rail Pressure	Result: The fuel rail pressure is greater than 5000 kPa (725 psi) after mechanically venting the pressure from the fuel system. The fuel system has been mechanically vented. A failed fuel rail pressure sensor has been detected. Repair: Replace the fuel rail pressure sensor. Proceed to Test Step 4.
4. Check for Codes A. Start the engine and operate the engine at high idle. B. Look for active or logged codes.	Codes	Result: No codes are 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).