J1939 Code and Description | CDL Code and Description | Comments |
---|---|---|
3509-3
Sensor Supply Voltage 1 : Voltage Above Normal |
262-3
5 Volt Sensor DC Power Supply : Voltage Above Normal |
All sensors are set to default values.
The code is logged. |
3509-4
Sensor Supply Voltage 1 : Voltage Below Normal |
262-4
5 Volt Sensor DC Power Supply : Voltage Below Normal |
All sensors are set to default values.
The code is logged. |
3510-3
Sensor Supply Voltage 2 : Voltage Above Normal |
2131-3
5 Volt Sensor DC Power Supply #2 : Voltage Above Normal |
Engine power may be derated.
The code is logged. |
3510-4
Sensor Supply Voltage 2 : Voltage Below Normal |
2131-4
5 Volt Sensor DC Power Supply #2 : Voltage Below Normal |
Engine power may be derated.
The code is logged. |
The Electronic Control Module (ECM) supplies a regulated voltage of 5.0 ± 0.2 VDC to the sensors.
The supply voltage for the sensors is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the sensors is routed from the ECM to terminal 2 of each sensor connector. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.
Note: The sensors are not protected from over voltage. A short from the supply line to the +Battery may damage the sensors. If any of the diagnostic codes are active, a sensor may have been damaged. Repair the sensor supply and check for any active sensor diagnostic codes to determine if a sensor has been damaged.
Illustration 1 | g03740995 |
Sensor connector (1) Sensor supply (2) Sensor return (3) Signal |
Sensor Supply | Sensor Supply ECM Location |
Sensor Supply #1 | Sensors on A5:E4 engine ECM J2 connector or A5:E2 aftertreatment controller J2 connector |
Sensor Supply #2 | Sensors on A5:E4 engine ECM J1 connector |
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 or -4 code is active. Note which ECM is reporting the active code. Proceed to Test Step 2. Result: A -21 code is active. Proceed to Test Step 3. |
2. Check for a Failed Sensor A. Connect Cat ET. B. Disconnect a sensor on the affected sensor supply circuit. C. Use Cat ET to monitor following: - Active code changes to logged D. Connect the affected sensor to the wiring harness. E. Repeat Step B through Step D for each sensor on the affected sensor supply. |
Sensor |
Result: The affected sensor supply active code changed to a logged code when a sensor is unplugged. Repair: Repair or replace the failed sensor. Verify that the repair eliminated the problem. Result: The affected sensor supply active code remains active after all the sensors on the sensor supply circuit have been checked. Repair: A failed wiring harness has been detected. Repair or replace the wiring harness. Verify that the repair eliminated the problem. |
3. Check the Sensor Supply A. Unplug the sensor from the wiring harness. B. Install the jumper wire between the following terminals at the sensor connector: - Terminal 1 (sensor supply) and Terminal 2 (sensor return) C. Connect Cat ET. D. Use Cat ET to monitor the following: - Codes |
Codes |
Result: A -4 code is activated on the affected sensor supply. Repair: Remove the sensor. Check the sensor passage for a blockage or obstruction. Also, check for moisture frozen in the lines. If blockage is not found, replace the sensor. Verify that the repair eliminated the problem. Result: A -4 code is not activated on the affected sensor supply. Repair: The problem is in the wiring harness from the ECM to the sensor connector. Repair or replace the wiring harness. 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).