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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 |
Red |
9 |
| Federal |
Red |
22 |
| Ground Circuit (Terminal No. 2) |
| California |
Black |
23 |
| Federal |
Black |
13 |