Pinpoint Test Ego - Exhaust Gas Oxygen Sensor
NOTE:
Enter this test only when a Code 15 (lean) or Code 17 (rich) is displayed during QUICK TESTS procedure.
EGO CIRCUIT PIN IDENTIFICATION
| Circuit | ECA Pin | BOB Pin | Wire Color | |
|---|---|---|---|---|
| EGO | ||||
| 1.3L | 2N | 29 | BLU | |
| 1.6L | 2D | 29 | BLK | |
- Warm engine to operating temperature, and let idle. Unplug EGO sensor. Measure voltage between EGO sensor connector (sensor side) and ground. With engine at idle, voltage should fluctuate between 0.2-0.8 volt.
- Increase and decrease engine speed while reading voltmeter. When engine speed is decreasing, voltage should decrease. When engine speed is increasing, voltage should increase. If voltage is within specification, go to next step. If voltage is not within specification, replace EGO sensor.
- With ignition off, install BOB. Leave ECA disconnected. Unplug EGO sensor connector. Measure continuity between EGO test pin and EGO sensor connector wire. If continuity exists, EGO circuit is okay; return to QUICK TESTS if sent here from there. If not sent here from QUICK TESTS, replace ECA. If voltage is not as specified, repair VMREF wire to VAF. If continuity does not exist, service EGO sensor wire to ECA.