Component Inspection

Engine Control
P0325 Knock Sensor 1 Circuit Malfunction - Component Inspection

Component Inspection

1. Component resistance inspection.
(1) Ignition Off.
(2) Disconnect knock sensor connector.
(3) Measure resistance between terminals 1 and 2 of the sensor connector(Component side).
Specification : Approx. 5MOhms at 20°C(68°F)




2. Output signal inspection.
(1) Remove knock sensor from vehicle and secure (across mounting boss) in a shop vise.
(2) Set up an oscilloscope as follows :
Channel A (+): terminal 1 (-): terminal 2.
(3) Rap on vise with a ball peen hammer while monitoring oscilloscope screen (there should be a spike of less than 1 volt with each hammer strike).
Specification : knock sensor send a voltage spike with hammer strikes
3. Installation torque inspection.
(1) Check the installation torque of the knock sensor.
Specification : Approx. 16 - 28Nm(160 - 250 kg-cm,11.8 - 18.4 lb-ft)
4. Has a problem been found?
YES
> Check knock sensor for contamination, deterioration, or damage. Substitute with a known-good sensor and check for proper operation. If the problem is corrected, replace sensor and then go to "Verification of Vehicle Repair" procedure.
NO
> Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.