SWITCH AS-PUSH BUTTON 5212475 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
4367-3
Aftertreatment #1 DEF Quick Thaw Tank Level : Voltage Above Normal 3131-3
Aftertreatment #1 DEF Tank #2 Level Sensor : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The code is logged.
4367-4
Aftertreatment #1 DEF Quick Thaw Tank Level : Voltage Below Normal 3131-4
Aftertreatment #1 DEF Tank #2 Level Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
4368-3
Aftertreatment #1 DEF Tank #2 Temperature : Voltage Above Normal 3135-3
Aftertreatment #1 DEF Tank #2 Temperature Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
4368-4
Aftertreatment #1 DEF Tank #2 Temperature : Voltage Below Normal 3135-4
Aftertreatment #1 DEF Tank #2 Temperature Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged. The signal for the Diesel Exhaust Fluid (DEF) tank level sensor is routed to terminal 1 of the tank header unit. The signal for the DEF tank temperature sensor is routed to terminal 3 of the tank header unit. The sensor return is shared and is routed to terminal 2 of the tank header unit. The Electronic Control Module (ECM) provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.
Illustration 1 g01240891
(1) DEF level sensor signal
(2) Sensor return
(3) DEF tank temperature signal
Illustration 2 g06136353
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Apply electrical power to the engine.
B. Connect Cat® Electronic Technician (ET) to the service tool connector.
C. Determine if a code is active or logged.
Codes
Result: A -3 code is active.
Proceed to Test Step 2.
Result: A -4 code is active.
Proceed to Test Step 3.
2. Create a Short at the Sensor Connector
A. Verify that the wiring harness connector is free of debris, free of corrosion and securely connected.
B. Install a jumper wire between the appropriate signal and return wire at the sensor connector to create a short.
C. Apply electrical power to the engine.
D. Connect Cat ET.
E. Use Cat ET to monitor the following codes:
- -4 code
F. Remove electrical power from the engine.
Create a Short
Result: A -4 code becomes active.
Repair: The wiring is OK. Replace the DEF tank header assembly.
Verify that the repair eliminated the problem.
Result: A -4 code does not become active.
Repair: Repair or replace the wiring harness.
Verify that the repair eliminated the problem.
3. Create an Open at the Sensor Connector
A. Disconnect the connector of the tank header unit.
B. Apply electrical power to the engine.
C. Connect Cat ET.
D. Use Cat ET to monitor the following codes:
- -3 code
D. Remove electrical power from the engine.
Create an Open
Result: A -3 code becomes active.
Repair: The wiring is OK. Replace the DEF tank header assembly.
Verify that the repair eliminated the problem.
Result: A -3 code does not become active.
Repair: Repair or replace the wiring harness.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact