KIT-SEAL 4714231 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
1761-3
Aftertreatment #1 DEF Tank Volume : Voltage Above Normal 3130-3
Aftertreatment #1 DEF Tank #1 Level Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
1761-4
Aftertreatment #1 DEF Tank Volume : Voltage Below Normal 3130-4
Aftertreatment #1 DEF Tank #1 Level Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged. Diagnostics on the Caterpillar Electronic Technician (ET)
Illustration 1 g03702189
Not all connectors are shown, refer to the appropriate schematic
Probable Causes
Codes
Sensor
Sensor connectorRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Diesel Exhaust Fluid Controller (DCU) .
B. Turn the keyswitch to the ON position.
C. Look for "-3" or " -4" active or logged codes.
Diagnostic code
Result: A -3 diagnostic code is active.
Proceed to Test Step 2.
Result: A -4 diagnostic code is active.
Proceed to Test Step 3.
2. Create a Short at the Sensor Connector
A. Verify that the harness connector is free of debris, free of corrosion and securely connected.
B. Install a jumper wire between the signal and return wire at the sensor connector in order to create a short.
C. Turn the keyswitch to the ON position.
D. Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the level sensor.
E. Turn the keyswitch to the OFF position.
Short created
Result: A -4 diagnostic code became active after creating the short at the sensor connector.
The wiring is OK.
Repair: Replace the DEF tank level sensor. Refer to the Disassembly and Assembly manual.
Verify that the problem is resolved by cycling the keyswitch to the OFF position for 1 minutes. Turn to the keyswitch to the ON position and check for active codes.
Result: A -4 diagnostic code does not become active for the tank level sensor.
Repair: Repair or replace the wiring harness.
Verify that the problem is resolved by cycling the keyswitch to the OFF position for 1 minutes. Turn to the keyswitch to the ON position and check for active codes.
3. Create an Open at the Suspect Sensor Connector
A. Disconnect the connector of the tank level sensor.
B. Turn the keyswitch to the ON position.
C. Monitor the diagnostic codes on Cat ET. Check for an active -3 diagnostic code for the level sensor.
D. Turn the keyswitch to the OFF position.
Create an Open
Result: A -3 diagnostic code became active after disconnecting the sensor.
The wiring is OK.
Repair: Replace the DEF tank level sensor. Refer to the Disassembly and Assembly manual.
Verify that the problem is resolved by cycling the keyswitch to the OFF position for 1 minutes. Turn to the keyswitch to the ON position and check for active codes.
Result: A -3 diagnostic code does not became active after disconnecting the sensor.
Repair: Repair or replace the wiring harness.
Verify that the problem is resolved by cycling the keyswitch to the OFF position for 1 minutes. Turn to the keyswitch to the ON position and check for active codes.
If the procedure did not