3516C High Displacement Engine Caterpillar


Electrical Power Supply - Test

Usage:

3516C MLF
Use this procedure to troubleshoot the electrical system if a problem is suspected with the power to the engines Electronic Control Module (ECM). Use this procedure if any of the diagnostic codes in Table 1 is active or easily repeated.

Table 1
J1939 Code and Description     CDL Code and Description     Comments    
168-2
Battery Potential / Power Input #1 : Erratic, Intermittent, or Incorrect    
168-2
Electrical System Voltage : Erratic, Intermittent, or Incorrect    
The engine is running. The battery voltage falls below 6 VDC and the voltage returns above 9 VDC for three voltage readings in the last 7 seconds.    
168-3
Battery Potential / Power Input #1 : Voltage Above Normal    
168-3
Electrical System Voltage : Voltage Above Normal    
The ECM detects voltage that is above the acceptable value.    
168-4
Battery Potential / Power Input #1 : Voltage Below Normal    
168-4
Electrical System Voltage : Voltage Below Normal    
The ECM detects voltage that is below the acceptable value.    

Probable Causes

  • Codes

  • Charging circuit

  • Load Test




Illustration 1g02100347

Schematic for the electrical power supply circuit

Recommended 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).

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