3516E Engine for Tier 4 Final 994K Wheel Loaders Caterpillar

Electrical Power Supply - Test

Usage:

994K SMX

Use this procedure to troubleshoot a problem with the power to the engines Electronic Control Module (ECM). Also, use this procedure if one of the following diagnostic codes is active or easily repeated.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
168-3 Battery Potential / Power Input #1 : Voltage Above Normal	168-3 Electrical System Voltage : Voltage Above Normal	The Electronic Control Module (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.
3218-11 Aftertreatment #1 Intake Gas Sensor Power In Range : Other Failure Mode	3781-11 Aftertreatment #1 Intake NOx Level Sensor Power Supply : Other Failure Mode	The NOx sensor has detected that the power supply is not correct.
3228-11 Aftertreatment #1 Outlet Gas Sensor Power In Range : Other Failure Mode	3619-11 Aftertreatment #1 Outlet NOx Level Sensor Power Supply : Other Failure Mode	The NOx sensor has detected that the power supply is not correct.
3257-11 Aftertreatment #2 Intake Gas Sensor Power In Range : Other Failure Mode	5354-11 Aftertreatment #2 Intake NOx Level #1 Sensor Power Supply : Other Failure Mode	The NOx sensor has detected that the power supply is not correct.
3267-11 Aftertreatment #2 Outlet Gas Sensor Power In Range : Other Failure Mode	5353-11 Aftertreatment #2 Outlet NOx Level #1 Sensor Power Supply : Other Failure Mode	The NOx sensor has detected that the power supply is not correct.
3360-3 Aftertreatment #1 DEF Controller : Voltage Above Normal	3820-3 Aftertreatment #1 Diesel Exhaust Fluid Controller : Voltage Above Normal	The Diesel Exhaust Fluid Control Unit (DCU) has detected that the voltage is above the acceptable threshold.
3360-4 Aftertreatment #1 DEF Controller : Voltage Below Normal	3820-4 Aftertreatment #1 Diesel Exhaust Fluid Controller : Voltage Below Normal	The DCU has detected that the voltage is below the acceptable threshold.
4450-3 Aftertreatment #2 DEF Controller : Voltage Above Normal	4577-3 Aftertreatment #2 DEF Controller #1 : Voltage Above Normal	The DCU has detected that the voltage is above the acceptable threshold.
4450-4 Aftertreatment #2 DEF Controller : Voltage Below Normal	4577-4 Aftertreatment #2 DEF Controller #1 : Voltage Below Normal	The DCU has detected that the voltage is below the acceptable threshold.
7538-3 Aftertreatment #1 DEF Controller #2 : Voltage Above Normal	4797-3 Aftertreatment #1 Diesel Exhaust Fluid Controller #2 : Voltage Above Normal	The DCU has detected that the voltage is above the acceptable threshold.
7538-4 Aftertreatment #1 DEF Controller #2 : Voltage Below Normal	4797-4 Aftertreatment #1 Diesel Exhaust Fluid Controller #2 : Voltage Below Normal	The DCU has detected that the voltage is below the acceptable threshold.
7539-3 Aftertreatment #2 DEF Controller #2 : Voltage Above Normal	4798-3 Aftertreatment #2 DEF Controller #2 : Voltage Above Normal	The DCU has detected that the voltage is above the acceptable threshold.
7539-4 Aftertreatment #2 DEF Controller #2 : Voltage Below Normal	4798-4 Aftertreatment #2 DEF Controller #2 : Voltage Below Normal	The DCU has detected that the voltage is below the acceptable threshold.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the service tool connector. B. Determine if a code is active or logged.	Codes	Result: A -3 code is active or logged. Proceed to Test Step 2. Result: A -4 code is active or logged. Proceed to Test Step 3.
2. Check the Charging Circuit	Charging Circuit	Result: The charging system is OK. Proceed to Test Step 3. Result: The charging system is NOT OK. Repair: There is a problem with the charging system. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting" for additional information. Verify that the repair eliminated the problem.
3. Inspect the Batteries A. Charge the batteries, if necessary. Refer to Special Instruction, SEHS7633, "Battery Test Procedure" for additional information. B. Load-test the batteries. Refer to Special Instruction, SEHS9249, "Use of 4C-4911 Battery Load Tester for 6, 8 V and 12 V Lead Acid Batteries" for additional information.	Batteries	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. Repair: Verify that the "System Operating Voltage Configuration" is correctly configured in the Engine ECM configuration parameters. Verify that the repair eliminated the problem. Result: The battery voltage is low or the battery did not pass the load test. Repair: Repair or replace the batteries. Verify that the repair eliminated the problem.

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).