Harness Inspection

Disconnect EGR temperature sensor harness connector. Turn ignition on. Using DVOM, measure voltage between EGR temperature sensor harness connector terminal No. 1 and vehicle ground. See EGR TEMPERATURE SENSOR TERMINAL ID table. Voltage should be 4.3-4.7 volts. If voltage is within specification, circuit is okay. If voltage is not within specification, turn ignition off.
Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal and vehicle ground. See EGR TEMPERATURE SENSOR TERMINAL ID table.
Using ohmmeter, check resistance between EGR temperature sensor harness connector terminal No. 1 and vehicle ground. If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, substitute ECM with known good unit and retest.

Using ohmmeter, check resistance between EGR temperature sensor connector terminal No. 2 and vehicle ground. See EGR TEMPERATURE SENSOR TERMINAL ID table. If continuity does not exist, inspect and repair circuit as needed.

EGR TEMPERATURE SENSOR TERMINAL ID

Application

Wire Color

Corresponding ECM Terminal No.

Power Supply Circuit (Terminal No. 1)

California ⁽²⁾

Red

⁽³⁾ 9

Federal

Red

⁽¹⁾ 22

Ground Circuit (Terminal No. 2)

California ⁽⁴⁾

Black

⁽³⁾ 23

Federal

Black

⁽¹⁾ 13

⁽¹⁾	24-pin connector.

⁽²⁾	Terminal No. 2 (California).

⁽³⁾	22-pin connector.

⁽⁴⁾	Terminal No. 1 (California).