RING (INTERMEDIATE) 6N5026 - Caterpillar

Use this procedure to troubleshoot a high fuel flow in the high-pressure fuel system. Also, use this procedure if the following event code is active.
Table 1
J1939 Code and Description CDL Code and Description Conditions which Generate this Code
157–17
Engine Injector Metering Rail #1 Pressure : Low - Least Severe (1) E398(1)
Engine Injector Metering Rail #1 Pressure : Least Severe (1) The fuel rail pressure is lower than expected.
157–18
Engine Injector Metering Rail #1 Pressure : Low - Moderate Severity E398(2)
Engine Injector Metering Rail #1 Pressure : Moderate Severity (2) The fuel rail pressure is lower than expected.
1440–0
Engine Fuel flow Rate #1 : High - Most Severe (3) E1106(3)
High Fuel Rail Pump Flow : Most Severe (3) There is excessive leakage in the high-pressure fuel system. The code is logged. The check engine light will illuminate.
1440–15
Engine Fuel Flow Rate #1 : High - Least Severe (15) E1106(1)
High Fuel Rail Pump Flow : Least Severe (1) The ECM has detected that the fuel leakage on the high-pressure fuel system is above an acceptable threshold.
1440–16
Engine Fuel Flow Rate #1 : High - Moderate Severity (2) E1106(2)
High Fuel Rail Pump Flow : Moderate Severity (2) This code will only trip if an issue is detected in the low rail pressure range of operation. The check engine light will turn on when the code is tripped. This action signifies an increased risk that the engine might not restart if the engine is shut off. The truck should be taken to safe place for service.
5585–17
Engine Injector Metering Rail #1 Cranking Pressure : Low - Least Severe (1) E1220 (1)
Low Cranking Fuel Rail Pressure The fuel rail pressure is too low while cranking. This action can be caused by a fuel system service prior to starting the engine.
Table 2
Associated Codes
J1939 Code CDL Code
95-0 E390(3)
95-15 E390(1)
95-16 E390(2)
5578-3 289-3
5578-4 289-4
5580-3 460-3
5580-4 460-4
5580-17 E198(1)
5580-18 E198(2) Probable Causes
Diagnostic codes and event codes
Pressure relief valve leakage
High-pressure fuel pump leakage
High-pressure fuel rail leakage
Fuel control valve problemRecommended Actions
Table 3
Troubleshooting Test Step Value Result
1. Check for Codes
A. Turn the keyswitch to "ON".
B. Connect Cat® Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
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.
Codes
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Refer to the appropriate troubleshooting story.
Result: A 157, 1440, or 5585 code is present.
Proceed to Test Step 2.
2. Check the Low-Pressure Fuel System
A. Start the engine.
B. Connect Cat ET to the service tool connector.
C. With the engine running at low idle, record the "Fuel Pressure" value.
D. With the engine running at high idle, record the "Fuel Pressure" value.
Fuel pressure
Result: The gauge value is greater than 250