P0405
DTC P0405 EGRT SENSORComponent Description
The EGR temperature sensor detects temperature changes in the EGR passageway. When the EGR valve opens, hot exhaust gases flow, and the temperature in the passageway changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the ECM. This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance decreases. This sensor is not used to control the engine system.
It is used only for the on board diagnosis.
On Board Diagnosis Logic:
On Board Diagnosis Logic
DTC Confirmation Procedure
Perform PROCEDURE FOR DTC P0405 first. If 1st trip DTC cannot be confirmed, perform PROCEDURE FOR DTC P0406.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.
PROCEDURE FOR DTC P0405
With CONSULT-II
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Verify that engine coolant temperature is less than 50 °C (122 °F).
If the engine coolant temperature is above the range, cool the engine down.
4. Start engine and let it idle for at least 8 seconds.
5. If 1st trip DTC is detected, Go to "Diagnostic Procedure" below.
With GST
Follow the procedure "With CONSULT-II".
Overall Function Check
Use this procedure to check the overall function of the EGR temperature sensor. During this check, a 1st trip DTC might not be confirmed.
Wiring Diagram
EC-EGR/TS-01:
Diagnostic Procedure
Diagnostic Procedure (Steps 1 - 4):
Diagnostic Procedure (Step 5):
Component Inspection
EGR TEMPERATURE SENSOR
1. Check resistance change and resistance value.
2. If NG, replace EGR temperature sensor.