U059E

U059E-INVALID DATA RECEIVED FROM NOx SENSOR "A"





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The after treatment system is equipped with two Nox Sensors and modules. The upstream NOx Sensor 1/1 is located before the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module mounted on the right frame rail. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module also mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module assemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst. The PCM will illuminate the MIL lamp immediately after the monitor runs and fails. The PCM will turn off the MIL Lamp after the monitor runs and passes for three consecutive trips.

- When Monitored:
This monitor runs when the change rates of exhaust gas oxygen, NOx, exhaust pressure and exhaust flow are less than a calibrated threshold.

- Set Condition:
Fault is set if the percentage of time we get the not valid bit is received for more than a calibrated time within a fixed time frame.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Is the DTC active?

Yes

- Replace the NOx Sensor 1/1. Bank 1 Sensor 1
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Perform the INTERMITTENT CONDITION - 6.7L. Intermittent Condition Test