Hello all. I have a 1999 Subaru Outback 2.5. I've been getting a P0325 along with hesitation and the like for about a month, so I replaced the knock sensor. I cleared the code and drivability improved for about a week. Then, the hesitations came back and the code reappeared after about 100 miles. So I disconnected the single wire pigtail to the knock sensor and did a voltage test, knowing I am supposed to have a 5 volt reference to the knock sensor, but my multimeter is only showing 3.26 volts. I've been trying to trace the wire back to the ECU, but the process is driving me crazy. There are so many wires! Does anyone have any ideas, a.) why I'm dropping voltage and b.) what I can do to remedy this situation?
erikrocks
Lets not forget that P0325 points to Knock Sensor Circuit Malfunction...not the Knock-sensor itself.
I believe a better check would be OHMS from engine ground to the unplugged connector on the sensor. Is the resistance less than 400 kΩ?
Also, with the connector PLUGGED IN... you should see about 2.5v
Also, beware that the wiring to the sensor is shielded. DO NOT attempt to take voltage readings by 'punching thru' the insulation. This will surely cause problems.
I believe a better check would be OHMS from engine ground to the unplugged connector on the sensor. Is the resistance less than 400 kΩ?
Also, with the connector PLUGGED IN... you should see about 2.5v
Also, beware that the wiring to the sensor is shielded. DO NOT attempt to take voltage readings by 'punching thru' the insulation. This will surely cause problems.
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