EGR Position Sensor
- Disconnect ECU electrical connector. Connect Engine Signal Monitor (49-9200-162) and Test Harness (49 G018 903) to ECU. Connect vacuum pump to EGR control valve. Turn ignition on. Check voltage at ECU connector terminals. See EGR POSITION SENSOR VOLTAGE table.
- If voltage is not correct at terminals "A" and "B", check wiring harness and connection at ECU connector terminals 2J and 3D. If voltage is not correct at terminal "C", check sensor resistance, wiring harness and ECU connector terminal 2I.
- Disconnect EGR position sensor electrical connector. Connect ohmmeter to EGR position sensor. Disconnect vacuum hose from EGR control valve. Connect vacuum pump to EGR control valve.
- Check sensor resistance between indicated terminals. See EGR POSITION SENSOR RESISTANCE table. If resistance is not within specifications, replace sensor.
EGR POSITION SENSOR VOLTAGE
| Terminal (ECU) | Volts | |
|---|---|---|
| "A" (2J) | ||
| Without Vacuum | About 0.7 | |
| With 5.9 In. Hg | About 4.7 | |
| "B" (3D) | Less Than 1.5 | |
| "C" (2I) | 4.5-5.5 | |
EGR POSITION SENSOR RESISTANCE
| Terminals | Ohms | |
|---|---|---|
| "A" & "B" | ||
| Zero in. Hg | 2300 | |
| 6 in. Hg | 5800 | |
| "A" & "C" | ||
| Zero in. Hg | 5300 | |
| 6 in. Hg | 1200 | |
| "B" & "C" | 5000 | |