PUMP A 1070035 - Caterpillar

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
Diagnostic Codes Table
J1939 Code and Description Comments
168-3
Battery Potential / Power Input #1 : Voltage Above Normal The ECM detects voltage that is above the acceptable value.
168-4
Battery Potential / Power Input #1 : Voltage Below Normal The ECM detects voltage that is below the acceptable value.
3360-3
Aftertreatment #1 DEF Controller : Voltage Above Normal The ECM detects voltage that is above the acceptable value.
3360-4
Aftertreatment #1 DEF Controller : Voltage Below Normal The ECM detects voltage that is below the acceptable value.
5758-11
Aftertreatment #1 Intake Gas Sensor Power Supply : Other Failure Mode The ECM detects voltage that is outside the acceptable value.
5759-11
Aftertreatment #1 Outlet Gas Sensor Power Supply : Other Failure Mode The ECM detects voltage that is outside the acceptable value. The engine ECM requires the keyswitch to be in the ON position in order to maintain communications with Cat® Electronic Technician (ET).
Illustration 1 g06156053Note: The DEF Quality Sensor is only available on 2017models or later.
Table 2
1. Determine the Diagnostic Code
A. Establish communication between the Cat ET and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Start the engine. Run the engine until the engine is at normal operating temperature.
C. Observe the "Active Diagnostic" screen on Cat ET. Wait at least 30 seconds so that any codes may become active.
Diagnostic code
Result: A -3 or -11 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.
Check the wiring between the batteries and the ECM / NOx sensor. Refer to the application-specific wiring schematic for pin locations.
Check the connectors between the batteries and the ECM / NOx sensor for moisture and/or corrosion.
Repair or replace the wiring and/or the connectors.
Verify that the repair eliminates the problem.