EGR Valve Position Sensor: Testing and Inspection
OUTPUT VOLTAGEFig. 132 Exhaust gas recirculation system.:
Fig. 78 Testing EGR position sensor.:
1. Disconnect EGR position sensor connector.
2. Connect suitable tester between EGR position sensor and wiring harness, Fig. 78.
3. Disconnect vacuum hose from EGR control valve and connect a vacuum pump.
4. Turn ignition switch to On position.
5. Check voltage of each terminal. Voltage at terminal A should be 4.5-5.5 volts and voltage at terminal B should be less than 1.5 volts. Voltage at terminal C should be approximately .7 volt with no vacuum applied and approximately 4.7 volts with 5.9 inches Hg vacuum applied.
6. If voltages are not as described at terminals A and B, check wiring harness and terminals 2A and 2C of engine control unit.
7. If voltages are not as described at terminal C, check sensor resistance, then the wiring harness and terminal 2F of engine control unit.
RESISTANCE
Fig. 132 Exhaust gas recirculation system.:
1. Disconnect EGR position sensor connector and connect ohmmeter.
2. Disconnect vacuum hose from EGR control valve and connect vacuum pump.
3. Check resistance between terminals while applying vacuum. Resistance between terminal A and B should be approximately 5k ohms, resistance between terminals A and C should be .7-5k ohms and resistance between terminals B and C should be .7-5k ohms.