P2080
P2080-EXHAUST GAS TEMP SENSOR CIRCUIT PERFORMANCE - BANK 1 SENSOR 1
For complete wiring diagrams refer to Diagrams/Electrical.
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 oxidation catalyst 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 all aftertreatment regenerations. The ECM will turn off the MIL lamp immediately after the diagnostic runs and passes.
- When Monitored:
Engine Running
- Set Condition:
The ECM detects that the aftertreatment diesel oxidation catalyst inlet temperature sensor reading is not increasing with engine operating temperature after engine startup.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. OTHER DTCS
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. Powertrain Verification Test
No
- Go To 2
-
2. EXHAUST TEMPERATURE SENSOR 1/1
Remove the Exhaust Temperature Sensor 1/1 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
No
- Replace the Exhaust Temperature Sensor 1/1.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test