P2084

P2084-EXHAUST GAS TEMP SENSOR CIRCUIT PERFORMANCE - BANK 1 SENSOR 2





For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The Exhaust Temperature Sensors are used by the Electronic Control Module (ECM) to monitor the engine exhaust temperatures in the aftertreatment system. The Exhaust Temperature Sensors are thermistors and change resistance based on the temperature being measured. The ECM provides a 5-volt reference voltage to the sensor. The ECM monitors the voltage on the signal pin and converts this to a temperature value. This fault is set by the ECM if it detects that the aftertreatment diesel particulate filter inlet temperature sensor reading is not increasing with engine operating temperature after engine startup. The ECM illuminates the MIL lamp immediately when the diagnostic runs and fails. The ECM will disable active regeneration mode.

- When Monitored:
Engine Running.

- Set Condition:
The ECM detects that the aftertreatment diesel particulate filter inlet temperature sensor reading is not increasing with engine operating temperature after engine startup.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. OTHER DTCS
1. With a scan tool read DTCs.

Do you have any other DTC for the Exhaust Temperature Sensors?

Yes

- Repair all other DTCs first.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Go To 2

2. EXHAUST GAS TEMPERATURE SENSOR 1/2
1. Remove the Exhaust Temperature Sensor 1/2 and reconnect the wiring to the sensor. Monitor the scan tool, while heating the sensor with an external heat source (DO NOT USE OPEN FLAME).

Does the reading from the sensor increase at least -15°C (5°F) on the scan tool?

Yes

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition Test

No

- Replace the Exhaust Temperature sensor 1/2.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test