BALL BEARING 2D5658 - Caterpillar

Use this procedure to troubleshoot a problem with low Diesel Exhaust Fluid (DEF) pressure. Also, use this procedure if the following event code is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
6875-18
Aftertreatment #1 DEF Dosing Pressure : Low - least severe (1) E931 (1)
Low Aftertreatment #1 DEF Pressure The Diesel Exhaust Fluid (DEF) pressure is below the threshold for proper system operation.
DEF dosing is disabled.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
4368-1 N/A Troubleshooting, "DEF Tank Temperature is Low"
4368-3 N/A Troubleshooting, "DEF Tank Sensor - Test"
4368-4 N/A Troubleshooting, "DEF Tank Sensor - Test"
4368-17 N/A Troubleshooting, "DEF Tank Temperature is Low"
4368-18 N/A Troubleshooting, "DEF Tank Temperature is Low"
4335-15 E1969 (1) Troubleshooting, "Air Assist Pressure Is High"
4335-17 E964 (1) Troubleshooting, "Air Assist Pressure Is Low"
4335-18 E964 (2) Troubleshooting, "Air Assist Pressure Is Low"
4335-3 3092-3 Troubleshooting, "Sensor Signal (Analog, Active) - Test"
4335-4 3094-4 Troubleshooting, "Sensor Signal (Analog, Active) - Test"
4376-5 3862-5 Troubleshooting, "Solenoid Valve - Test"
4376-6 3862-6 Troubleshooting, "Solenoid Valve - Test"
6875-3 3090-3 Troubleshooting, "Sensor Signal (Analog, Active) - Test"
6875-4 3090-4 Troubleshooting, "Sensor Signal (Analog, Active) - Test"
7107-5 N/A Troubleshooting, "DEF Pump Motor - Test"
7107-6 N/A Troubleshooting, "DEF Pump Motor - Test"
7107-11 N/A Troubleshooting, "DEF Pump Motor - Test"
7416-5 N/A Troubleshooting, "Solenoid Valve - Test - Aftertreatment"
7416-6 N/A Troubleshooting, "Solenoid Valve - Test - Aftertreatment"
7417-2 N/A Troubleshooting, "DEF Pump Power Supply - Test"
7417-5 N/A Troubleshooting, "Circuit Breaker - Test"
7417-6 N/A Troubleshooting, "Circuit Breaker - Test"
Illustration 1 g03746847
Diesel Exhaust Fluid (DEF) dosing control cabinet components
Valves are shown in a static state
(1) DEF line to injector at CEM
(2) Air line to injector at CEM
(3) Compressed air source (customer supplied)
(4) DEF source (customer supplied)
(5) DEF pressure sensor
(6) Air assist pressure sensor
(7) Air pressure regulator
(8) Air assist valve
(9) DEF buffer tank return valve
(10) DEF buffer tank fill valve
(11) DEF pump
(12) DEF level sensor
(13) DEF buffer tank
Illustration 2 g03747254
Enhanced Troubleshooting Information (ETI) code
Probable Causes
Codes
Gas temperature
Sensor
Leaks
DEF line
Voltage
LED light
DEF pump
DebrisRecommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Turn the