Camshaft Position Sensor Circuit problem
2002 Mercury Sable 3.0 OHV engine. My Check Enginer Light was on recently and got code P0340 Camshaft Position Sensor circuit malfunction. The car does have a rough idle and engine stalls frequently.
I then measured the votage of the two cables on the sensor connector. The red one (positive power) has only 0.3v while it should be above 10v according to the Haynes Repair Manual. The other one (sensor signal) has a pulsing voltage from 0.2-0.6, while the manual says should be around 5v pulsing voltage.
I also measured the red Power cables of the IAC valve and the Fuel Injectors, all are around 12v. According to the electrial chart on the manual these power cables including the CPS' one are all connected to the same pins on the PCM (Pin 19, 21), so I think the votage has no problem at the PCM side and must be something wrong for the cable between the PCM and CPS. (I measured two points before and after the CPS connector, both 0.3v, so I guess the connector has no problem.)
What should I do now? How can I get this fixed? I'm thinking to make a cable connecting from the IAC + terminal to the CPS + terminal directly. Is that feasible?
Any suggestions are welcome! Thanks.