dg2: Test Knock Circuit for Voltage
| Steps | _Key Off, wait 10 seconds
_Disconnect Knock Sensor connector _DVOM on 20 volt scale _Key On, engine Off _Measure voltage between KS and Signal Return at the vehicle harness connector |
| Result | Voltage is between 1 and 4 volts. GO to Continue
Voltage is less than 1 volt. GO to Continue Voltage is greater than 4 volts. GO to Continue |
| Component | Knock Sensor |
| Description | The
Knock Sensor is a piezoelectric accelerometer with the sensor designed
to resonate at approximately the same frequency as engine knock. The
sensor uses resonant frequency to mechanically amplify the vibrations.
This method allows relatively large signals to be achieved without
electrical amplification and with small package size. The sensor has a
thin circular piezoelectric ceramic disk which is bonded to a metal
diaphragm.
Electrical connections are made through a two pin integral connector. |
| Location | Threaded into lower intake manifold |
| Wire Colors | Yellow with Red stripe
Black with White stripe |
| Notes | M12 x 1.5mm-6g
5.7K Resonant Frequency Grey |
| Image |   "> |