EGR Temperature Sensor: Testing and Inspection

EGR Temperature Sensor Circuit:

To test the EGR Temperature Sensor, located on the EGR valve, proceed as follows.

EGR Temperature Sensor Test:

COMPONENT TEST
1. Place the EGR temperature Sensor in water and heat to 50°C (122°F).
2. Read the resistance value between terminals 1 and 2, resistance should be between 60k - 83k ohm.
3. Heat the water to boiling, 100°C (212°F).
4. Read the resistance value between terminals 1 and 2, resistance should be between 11k - 14k ohm.

If the EGR Temperature Sensor measures out of the specification range, replace the sensor.


HARNESS TEST:
1. Disconnect the EGR temperature sensor connector and turn the key to the ON position.
2. Using a voltmeter, measure the power supply voltage between the harness connector terminal 2 and ground.

Voltage:
4.3 - 4.7 Volts.

3. Check for continuity between the EGR temperature sensor harness connector terminal 1 and ECM harness connectors 17 and 24.

Continuity:
Should exist



If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, clear the trouble codes and road test the vehicle to confirm that the repair has corrected the problem and the code doesn't return.
If the trouble code returns, it is possible that there is an intermittent failure of the component or the ECM. Check for looseness at all harness junctions and test for an intermittent failure.