C175-16 Locomotive Engine Caterpillar

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

Table 1

J1939 Code and Description	CDL Code and Description	Comment
157-15 Engine Injector Metering Rail #1 Pressure : Data High – Least Severe (1)	E396 (1) High Fuel Rail Pressure	The fuel rail pressure is above a threshold.

Table 2

Associated Codes
J1939 Code	CDL Code	Troubleshooting Procedure
157-3	1797-3	Troubleshooting, "Sensor Signal (Analog, Active) - Test"
157-4	1797-4	Troubleshooting, "Sensor Signal (Analog, Active) - Test"
1076-7	18-7	Troubleshooting, "Fuel Control - Test"
1440-0	E1106 (3)	Troubleshooting, "Fuel Flow is High"
1440-15	E1106 (1)	Troubleshooting, "Fuel Flow is High"
1440-16	E1106 (2)	Troubleshooting, "Fuel Flow is High"

Table 3

Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Turn the keyswitch to ON. B. Connect Cat® Electronic Technician (ET) to the service tool connector. C. Turn the keyswitch to ON. D. Look for active or logged diagnostic codes.	Codes	Result: An associated code is present. Repair: Troubleshoot any associated codes before continuing with this test. Result: A 157-15 or E396 code is present. Proceed to Test Step 2.

Illustration 1	g06085238
High-pressure fuel pump (1) Rail pressure sensor

Table 4

Troubleshooting Test Steps	Values	Results
2. Verify the Fuel Rail Pressure Sensor Reading A. Turn the keyswitch to OFF. B. 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. C. Turn the keyswitch to ON. D. Connect Cat ET. E. Monitor the following parameter in Cat ET. - Fuel Rail Pressure Note: The fuel rail pressure sensor is not reusable. If removed, then the sensor must be replaced.	Fuel Pressure	Result: The "Fuel Rail Pressure" is 0 ± 8 MPa (0.0 ± 1160 psi). Proceed to Test Step 3. Result: The "Fuel Rail Pressure" is greater than 0 ± 8 MPa (0.0 ± 1160 psi). A failed fuel rail pressure sensor has been detected. Repair: Vent the pressure from the fuel system. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release". Replace the fuel rail pressure sensor. Proceed to Test Step 3.
3. Check for Codes A. Remove the accumulator leak detection plugs and run a "Fuel System Functional Test" in Cat ET. B. Start the engine and operate the engine at high idle. C. Look for active or logged diagnostic codes.	Codes	Result: No codes present. Reinstall the accumulator leak detection plugs. 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).