LOCK 9S3187 - Caterpillar

Use this procedure to troubleshoot a problem with the DEF tank level. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
1761-1
Aftertreatment #1 DEF Tank Volume : Low - most severe (3) E954 (3)
Low Aftertreatment #1 DEF Tank #1 Level The DEF tank level is critically low.
1761-17
Aftertreatment #1 DEF Tank Volume : Low - least severe (1) E954 (1)
Low Aftertreatment #1 DEF Tank #1 Level The DEF tank level is low.
1761-18
Aftertreatment #1 DEF Tank Volume : Low - moderate severity (2) E954 (2)
Low Aftertreatment #1 DEF Tank #1 Level The DEF tank level is low.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
1761-3 3130-3 Troubleshooting, "DEF Tank Sensor - Test"
1761-4 3130-4 Troubleshooting, "DEF Tank Sensor - Test"
4335-17 E964(1) Troubleshooting, "Air Assist Pressure Is Low"
4335-18 E964(2) Troubleshooting, "Air Assist Pressure Is Low"
4336-5 3094-5 Troubleshooting, "Solenoid Valve - Test"
4336-6 3094-6 Troubleshooting, "Solenoid Valve - Test"
4376-5 3120-5 Troubleshooting, "DEF Return Valve - Test"
4376-6 3120-6 Troubleshooting, "DEF Return Valve - Test"
5434-5 N/A Troubleshooting, "Solenoid Valve - Test - Aftertreatment"
5434-6 N/A Troubleshooting, "Solenoid Valve - Test - Aftertreatment"
Illustration 1 g03718581
Not all connectors are shown, refer to the appropriate schematic.
Probable Causes
Codes
DEF level
DEF lines
DEF filter
Transfer pump (if equipped)
Relay circuit
Aftertreatment ECM software
Solenoid OverrideRecommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Turn the breaker to the ON position.
B. Establish communication between Caterpillar® Electronic Technician (ET) and the Electronic Control Module (ECM).
C. Determine if a code is active or logged.
Diagnostic Code
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An E954 or 1761 code is present.
Proceed to Test Step 2.
2. Check the Customer DEF Tank Level
A. Turn the DC breaker to the OFF position.
B. Visually inspect the level of DEF in the customer DEF tank.
DEF Level
Result: The customer DEF tank level is low.
Repair: Add DEF to the DEF tank #1.
Verify that the repair eliminated the problem. Return to service.
Result: The customer DEF tank level is NOT low.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Customer Tank and Supply Lines
A. Turn the DC breaker to the OFF position.
B. Visually inspect the customer tank and all of the DEF lines between the customer tank and buffer tank.
C. Inspect the lines to ensure that the lines are connected and not damaged.
DEF Lines
Result: The DEF supply line form the customer tank to the buffer tank are connected and are not damaged.
Proceed to Test Step 4.
Result: The DEF supply lines from the customer tank to the buffer tank are NOT connected or are damaged.
Repair: Repair or replace the lines if damaged.
Verify that the repair eliminated the problem. Return to service.
4. Monitor the "DEF Tank #1 Level"
A. Turn the DC breaker to the OFF position for 1 minute to allow the ECM to power down.
B. Turn the DC breaker to the ON position.
C. Ensure that the air supply to the Dosing Cabinet is ON.
D. Connect Cat ET.
E. Monitor the "DEF Tank #1 Level"