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Exhaust Gas RECIRCULATION (EGR) Position Sensor

  1. Disconnect EGR position sensor connector. Position sensor is mounted on top of EGR valve. Measure resistance between terminals E2 and VC at EGR position sensor. See Fig 1. If resistance is not 1.4-4.3 ohms, replace sensor. If resistance is 1.4-4.3 volts, go to next step.
  2. Turn ignition on. Access ECM behind glove box. Leave harness connectors attached to ECM. While backprobing connector, measure voltage between terminals No. 1 (Yellow wire) and No. 22 (Brown wire) at ECM E9 connector. See Figure. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, replace ECM and retest.
  3. Disconnect vacuum hose from EGR valve and connect a vacuum pump to EGR valve. Backprobing connector, measure voltage between terminal No. 15 (White/Green wire) at ECM E8 connector and terminal No. 22 (Brown wire) at ECM E9 connector. With 8 in. Hg applied, voltage should be 3.2-5.1 volts. With vacuum released, voltage should be .4-1.6 volts. If voltage is not as specified, replace EGR position sensor.
Fig 1: Testing EGR Position Sensor
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