When the ECM receives a signal from this sensor that is out of range, irrational compared to other engine data, or simply missing, it triggers CID 1493.
Monitor the signal voltage while the key is on (engine off) and during engine operation. The voltage should change smoothly as the EGR valve opens and closes. A "flat line" voltage suggests a dead sensor or open circuit. cid 1493
When the ECM receives a signal from this sensor that is out of range, irrational compared to other engine data, or simply missing, it triggers CID 1493.
Monitor the signal voltage while the key is on (engine off) and during engine operation. The voltage should change smoothly as the EGR valve opens and closes. A "flat line" voltage suggests a dead sensor or open circuit.