| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
EGR valve position sensor is mounted on EGR valve and monitors EGR valve pintle position. EGR valve pintle position is dependent upon engine operating conditions. DTC is set if there is an open or short in EGR valve position sensor circuit. Possible causes are
- Open or short in EGR valve position sensor circuit.
- EGR valve position sensor.
- ECM.
Note. For information on engine immobilizer system, see COMPUTERIZED ENGINE CONTROLS in THEORY/OPERATION article.