EGR Temperature Sensor: Testing and Inspection

TESTING PROCEDURE:

Fig. 166 E.G.R. TEMPERATURE SENDER:

NOTE: Check that EGR temperature sensor is equipped with a white marking wrapped around the wires. If not, replace sensor with updated version.
While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Use the wiring diagrams found in SCHEMATIC DIAGRAMS to supplement your testing efforts.

Accessing Ignition ECU Connector:

1. Turn ignition OFF.
2. Access ignition ECU by removing the panel under left hand side of instrument panel.
3. Remove ECU connector by pushing out the catch and folding out the wire cluster.
4. Check ignition ECU ground connections at intake manifold. They should make good contact.

Removing Protective Cover:

5. Remove connector protective sleeve.
IMPORTANT: ^ Never check connections from the front. Connectors can get damaged and worsen the problem.
^ Check connections through the holes in the connector.
^ Connection pin numbers are printed on the connector side.

Checking Terminal Pins:

6. Check that terminal contacts have been pushed down evenly in connector.
7. If any connectors have been pushed down to far, poor connection may result.

Fig. 167 CONTROL UNIT CONNECTOR:

8. Connect an ohmmeter between pin 14 and 22.

Reading: 500 - 1000 ohms

Fig. 168 CONTROL UNIT WIRING FOR E.G.R. SYSTEM:

9. If reading is different, check wiring and repair as necessary. If wiring is in good working condition, replace and retest with new sensor.
10. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.