BUSHING 1F2381 - Caterpillar

Table 1 lists the diagnostic codes for the Diesel Exhaust Fluid (DEF) pump circuit.
Table 1
Diagnostic Trouble Codes    
J1939 Code    CDL Code    Code Description    Comments    
3511-11     3482-11     Sensor Supply #3:Other Failure Mode     High or low battery voltage supply has been detected on the 5V supply to the DEF pump.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    Note: 372-5260 Test Kit is required for completing this procedure.
Illustration 1 g03196836
Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check the DEF Pump Pressure Sensor Supply Circuit for Excessive Voltage
A. Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be OFF for 2 minutes to allow the DEF pump to purge, reset the code, and reset the Diesel Exhaust Fluid Controller (DCU).
B. Disconnect the Pump Electronic Tank Unit (PETU) harness from the DEF pump.
C. Verify that the harness connector is free of debris, free of corrosion, and securely connected.
D. Turn the keyswitch ON.
E. Measure the voltage between the 5V SUPPLY (Terminal 2) at the DEF pump connector and a known good ground source.
   
Supply Voltage    
Result: The voltage is greater than 5V.
Proceed to Test Step 3.
Result: The voltage is 5V or less.
Proceed to Test Step 2.
   
2. Check the DEF Pump Pressure Sensor Supply for a Short Circuit to Ground
A. Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be OFF for 2 minutes to allow the DEF pump to purge, reset the code, and reset the DCU.
B. Disconnect the PETU wiring harness from the DEF pump.
C. Disconnect the 86 pin connector from the DCU.
D. Connect the 398-5056 Break-out Connector to the DEF pump connector.
The 398-5056 Break-out Connector must be used to prevent damage to the DEF pump connector.
E. Measure the resistance between the 5V SUPPLY (Terminal 2 at the DEF pump connector) and a known good ground source.