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Symptom: P0404 - EGR POSITION SENSOR PERFORMANCE When Monitored and Set Condition: P0404 - EGR POSITION SENSOR PERFORMANCE When Monitored: Set Condition: The EGR flow or valve movement is not what is expected. POSSIBLE CAUSES GOOD TRIP EQUAL TO ZERO HIGH RESISTANCE IN 5 VOLT SUPPLY EGR SENSOR SIGNAL CIRCUIT OPEN EGR ASSEMBLY EGR SOLENOID CONTROL CKT INTERMITTENT CONDITION EGR SENSOR SIGNAL CIRCUIT OPEN EGR SENSOR SIGNAL CIRCUIT SHORTED TO GROUND SENSOR GROUND CIRCUIT OPEN EGR ASSEMBLY (GROUND) PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, read DTCs and record the related Freeze Frame data. Is the Good Trip displayed and equal to zero? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 2 NOTE: Diagnose all other EGR DTC(s) first before continuing. t, read the EGR Position Sensor voltage. Choose a conclusion that best matches the EGR voltage reading. All Below 3.5 volts Between 3.5 volts to 4.3 volts Above 4.3 volts 149 DRIVEABILITY - NGC |