C175-16 Locomotive Engine Caterpillar

Fuel Rail Temperature Is High

Usage:

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Illustration 1	g02794262
Location of the high-pressure fuel temperature sensor (view of the high-pressure fuel pump)

Use this procedure in order to troubleshoot high fuel temperature. Also, use this procedure if one of the following event codes is active.

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Table 1
Event Code
CDL Code and Description	Conditions which Generate this Code	System Response
E770(1) High Fuel Rail Temperature	The fuel temperature of the high-pressure system is above the trip point for the programmed delay time.	The code is logged.
E770(2) High Fuel Rail Temperature		The code is logged. Engine power will be derated.
E770(3) High Fuel Rail Temperature		The code is logged. The engine is shut down.

If high fuel temperature shuts down the engine, cycle the power to the engine Electronic Control Module (ECM) in order to restart.

Probable Causes

Diagnostic codes and event codes
Fuel temperature sensors

Recommended Actions

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Table 2
Troubleshooting Test Step	Value	Result
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.	E770	Result: An associated code is present. Repair: Troubleshoot any associated codes before continuing with this test. Result: A E770 code is present. Proceed to the next step. Result: No active codes STOP
2. Check the Fuel Temperature Sensors A. Use Cat ET to monitor the values for the following parameters: - Fuel Temperature - Fuel Rail Temperature	Parameter value	Result: A value for a parameter is not within reason. Proceed to the next step.
3. Check the Sensor Circuit Components A. Inspect the suspected sensor, wiring, and connectors for damage and corrosion. Refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to intermittent electrical problems.	Components	Result: A circuit component is damaged or corroded. Repair: Repair or replace the circuit component. Result: A circuit component is not damaged or corroded. Repair: Replace the sensor.