C9 Engine and D7E Track-Type Tractors Caterpillar

Use this procedure in order to troubleshoot high fuel rail pressure or use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

Table 1

Event Code
Description	Default Conditions which Generate this Code	System Response
E396(1) High Fuel Rail Pressure	The fuel rail pressure is above an acceptable level.	The code is logged. The engine will default to a predetermined value.

Probable Causes

• Diagnostic codes and event codes

• High pressure fuel system

Recommended Actions

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Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.

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Do not loosen any high pressure fuel lines when the engine is running. The high pressure in the fuel lines can cause personal injury or death. Wait 60 seconds after the engine has stopped to allow pressure to purge before any service or repair is performed on the engine fuel lines.

Diagnostic Codes and Event Codes

Connect Caterpillar Electronic Technician (ET) to the service tool connector. Look for active diagnostic codes that are related to the fuel system. Use the appropriate procedure to troubleshoot any active codes before continuing.

High Pressure Fuel System

Perform the "Fuel System Functional Test". Cat ET will display an error message that indicates the problem. Follow the repair procedure for the error message:

"Fuel Pump Not Timed Correctly" - Remove the high pressure fuel pump and install the high pressure fuel pump. Then, run the "Fuel System Functional Test" in order to verify that the pump is timed correctly.

"Fuel Pump Flow Too Low" - Replace the high pressure fuel pump. Then, run the "Fuel System Functional Test" again in order to verify that the problem is resolved.

"Fuel Rail High Pressure Decay Too High" - Replace the pressure relief valve. Then, run the "Fuel System Functional Test" again in order to verify that the problem is resolved. If the problem is not resolved, refer to Systems Operation/Testing and Adjusting, "High Pressure Fuel Bypass - Test".

"Fuel Rail Low Pressure Decay Too High" - Refer to Systems Operation/Testing and Adjusting, "High Pressure Fuel Bypass - Test".