NOx Sensor Supply - Test
Use this procedure to troubleshoot a problem with the NOx sensor supply. 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 |
|---|---|---|
| 3216-6
Aftertreatment #1 Intake NOx : Current Above Normal |
3002-6
Engine Exhaust NOx Level Sensor : Current Above Normal |
A short circuit has been detected in the circuit for the NOx sensor power supply |
| 3226-6
Aftertreatment #1 Outlet NOx : Current Above Normal |
3609-6
Aftertreatment #1 Outlet #1 NOx Level Sensor : Current Above Normal |
A short circuit has been detected in the circuit for the NOx sensor power supply |
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| |
| Illustration 1 | g06325932 |
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| Troubleshooting Test Steps | Value | Results |
|---|---|---|
1. Check for Codes A. Turn the DC breaker to ON. B. Connect Cat® Electronic Technician (ET) to the service tool connector. C. Determine if a code is active or logged. |
Codes |
Result: A -6 code for a NOx sensor is active or logged. A short circuit in the wiring harness between the Electronic Control Module (ECM) and the NOx sensor power supply has been detected. Repair: 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).
Caterpillar Information System:
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