DRYER & LINES GP-AIR 3112739 - Caterpillar

Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
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"
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
Sensor
DEF line
DEF injector
DEF pumpRecommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Turn the DC breaker, located in the power distribution box, to the ON position.
B. Connect Cat® Electronic Technician (ET) to the service tool connector.
C. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Record the Enhanced Troubleshooting Information (ETI) code with the event. Refer to Illustration 2 for the ETI code location.
Proceed to Test Step 2.
2. Monitor the Catalyst Intake Gas Temperature
A. Turn the DC breaker, located in the power distribution box, to the ON position.
B. Connect Cat ET.
C. Use Cat ET to monitor the following temperature:
- "Aftertreatment #1 SCR Catalyst Intake Gas Temperature"
Temperature
Result: The "Aftertreatment #1 SCR Catalyst Intake Gas Temperature" is less than 180° C (356° F)
Proceed to Test Step 3.
Result: The "Aftertreatment #1 SCR Catalyst Intake Gas Temperature" is 180° C (356° F) or higher.
Repair: Use Cat ET to perform the following override:
- Set the "Aftertreatment #1 SCR Dosing Air Assist Valve Command Override" to the OFF position.
Proceed to Test Step 3.
3. Check the DEF Pressure Sensor
A. Turn the DC breaker, located in the power distribution box, to the ON position.
B. Connect Cat ET.
C. Use Cat ET to monitor the following pressure:
- "Aftertreatment #1 DEF Dosing Pressure"
Sensor
Result: The DEF pressure sensor reads 0 20 kPa (0 3 psi).
Proceed to Test Step 4.
Result: The DEF pressure sensor does not read 0 20 kPa (0 3 psi).
Repair: Replace the DEF pressure sensor.
Proceed to Test Step 8.
4. Determine the ETI Code
A. Use the ETI code recorded in Step 1 to determine the troubleshooting.
Code
Result: An ETI code of 4 is present.
Proceed to Test Step 5.
Result: An ETI code of 1 is present.
Repair: A failed DEF injector has been detected. Replace the DEF injector.
Proceed to Test Step 8.
Result: An ETI code of 2 is present.
Repair: A failed DEF return valve has been detected. Replace the DEF return valve.
Proceed to Test Step 8.
Result: An ETI code of 3 is present.
Repair: A failed DEF