Code 0305

The EGR temperature sensor detects temperature changes in the EGR passage way. When the EGR valve opens, hot exhaust gases flow, and the temperature in the passage way 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 directly used to control the engine system. It is used only for the on-board diagnosis.




DIAGNOSTIC CHART




OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the EGR temperature sensor. During this check, a DTC might not be confirmed.

Procedure for malfunctions A and B
CONSULT
1) Turn ignition switch "ON" and select "DATA -MONITOR" mode with CONSULT.




2) Confirm that engine coolant temperature and intake air temperature are lower than 40°C (104°F). (If necessary, wait until the temperatures equal atmospheric temperature.)
3) Confirm that "EGR TEMP SEN" reading is between 3.45V and 5.0V.
4) Start engine and warm it up sufficiently.
5) Run engine at idle for at least 2 minutes.
6) Confirm that EGR valve is not lifting. If NG, go to TROUBLE DIAGNOSES FOR DTC 0302 and 0306.




7) Read "EGR TEMP SEN" at about 1,500 rpm with EGR valve lifted up to the full position by hand. Voltage should decrease to less than 1.0V.
8) If step 7 is OK, perform TROUBLE DIAGNOSES FOR DTC 0302, 0306 and 1005.

OR

NO TOOLS
1) Turn ignition switch "ON".




2) Confirm that voltage between ECM terminals (58), (59) and ground are more than 2.72V. (If necessary, wait until engine coolant temperature and intake air temperature equal atmospheric temperature.)
3) Confirm that voltage between ECM terminal (63) and ground is between 3.45V and 5.0V.
4) Start engine and warm it up sufficiently.
5) Run engine at idle for at least 2 minutes.
6) Confirm that EGR valve is not lifting. If NG, go to TROUBLE DIAGNOSES FOR DTC 0302, 0306 and 1005.




7) Check voltage between ECM terminal (63) and ground at about 1,500 rpm with EGR valve lifted up to the full position by hand.

Voltage should decrease to less than 1.0V.

8) If step 7 is OK, perform TROUBLE DIAGNOSES FOR DTC 0302, 0306 and 1005.

COMPONENT INSPECTION
EGR temperature sensor




Check resistance change and resistance value at 100°C (212°F).
- Resistance should decrease in response to temperature increase.

Resistance: 100°C (212°F)
76.8 - 93.8 K Ohms

If NG, replace EGR temperature sensor.




WIRING DIAGRAM