PLATFORM AS 3934430 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
444-2
Battery Potential / Power Input 2: Erratic, Intermittent, or Incorrect 168-4
Electrical System Voltage : Voltage Below Normal The 24 VDC voltage falls below 18 VDC for .5 seconds.
The 24 VDC voltage must return above 18.2 VDC for 3 seconds in order for the diagnostic to reset.
The engine is running for at least 3 seconds.
444-3
Battery Potential / Power Input 2 : Voltage Above Normal 168-2
Electrical System Voltage : Erratic, Intermittent, or Incorrect The battery supply voltage is greater than 32 VDC on 24 VDC systems for 0.5 seconds, or the battery supply voltage is greater than 16 VDC on 12 VDC systems for 0.5 seconds.
The engine ECM has been powered for 3 seconds.
The engine has been running for at least 30 seconds.
444-4
Battery Potential / Power Input 2 : Voltage Below Normal 168-3
Electrical System Voltage : Voltage Above Normal The battery supply voltage is less than 18 VDC on 24 VDC systems for 0.5 seconds or the battery supply voltage is less than 9 VDC on 12 VDC systems for 0.5 second.
The engine ECM has been powered for 3 seconds.
The engine is running for at least 3 seconds. Probable Causes
Codes
Charging circuit
Load TestRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
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. Check the Charging Circuit
A. Check the charging circuit. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting".
Charging circuit
Result: The charging system is OK.
Proceed to Test Step 3.
Result: The charging system is not OK.
There is a problem with the charging system. Make the necessary repairs. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting".
3. Load Test the Battery
A. Load test the battery. Refer to Systems Operation and Testing and Adjusting, "Battery - Test"
Load test
Result: The battery voltage is low or the battery did not pass the load test.
Recharge or replace the faulty batteries. Verify that the repair eliminates the problem.
Result: The batteries pass the load test. The measured voltage is between 11.5 VDC and 13.5 VDC for a 12 v system. The measured voltage is between 23.0 VDC and 27.0 VDC for a 24 v system.
Verify that the "System Operating Voltage Configuration" is correctly configured in the Engine ECM configuration parameters.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).