Electrical Power Supply - Test
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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| J1939 Code and Description | CDL Code and Description | Comments |
|---|---|---|
| 168-3
Battery Potential / Power Input #1 : Voltage Above Normal |
168-3
Battery Potential / Power Input #1 : Voltage Above Normal |
The battery supply voltage is less than 18 VDC on 24 VDC systems for 0.5 seconds.
The engine Electronic Control Module (ECM) has been powered for 3 seconds. The engine is running for at least 3 seconds. |
| 168-4
Battery Potential / Power Input #1 : Voltage Below Normal |
168-4
Battery Potential / Power Input #1 : 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. |
| 5758-11
Aftertreatment #1 Intake Gas Sensor Power Supply : Other Failure Mode |
3781-11
Aftertreatment #1 Intake NOx Level Sensor Power Supply : Other Failure Mode |
The ECM detects voltage that is below the acceptable value. |
| 5759-11
Aftertreatment #1 Outlet Gas Sensor Power Supply : Other Failure Mode |
3619-11
Aftertreatment #1 Outlet #1 NOx Level Sensor Power Supply : Other Failure Mode |
The ECM detects voltage that is below the acceptable value. |
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| 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 Power Supply Circuit |
Power Supply |
Refer to OEM device troubleshooting. |
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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