EGR Boost Sensor
- Connect Engine Signal Monitor (49 9200 162A) to ECM, using proper overlay and adapter cables. Turn ignition on. Disconnect vacuum hose from EGR boost sensor. Sensor is located in center rear of engine compartment.
- Measure voltage at ECM terminal 3F while applying vacuum to EGR boost sensor. Voltage should decrease as vacuum is increased. See EGR BOOST SENSOR SPECIFICATIONS table. If voltage is as specified, sensor is functioning properly. If voltage is not as specified, go to next step.
- Turn ignition off. Check continuity of circuits between EGR boost sensor wiring harness connector and ECM. See appropriate wiring diagram in WIRING DIAGRAMS - 2.5L article. If continuity exists in all circuits, go to next step. If continuity does not exist in one or more circuits, repair open in wiring harness as necessary.
- Turn ignition on. Measure voltage at terminal "B" at EGR boost sensor wiring harness connector. See Fig 1 . Voltage should be less than one volt. Measure voltage at terminal "C" at EGR boost sensor wiring harness connector. Voltage should be 4.5-5.5 volts. If voltage is as specified, replace EGR boost sensor. If voltage is not as specified, locate and repair short circuit in wiring harness. See appropriate wiring diagram in WIRING DIAGRAMS - 2.5L article.
EGR BOOST SENSOR SPECIFICATIONS
| With In. Hg Applied | Volts |
|---|---|
| Zero | 3.6-4.4 |
| 16.1 | 1.7-2.0 |
| 24.0 | .7-.9 |