dg4: Check KS Circuit for Short to Ground
| Steps | _Key Off, wait 10 seconds
_Breakout box installed _Processor disconnected _Knock sensor disconnected _DVOM on 200,000 ohm scale _Measure resistance between KS at the knock sensor vehicle harness connector and Test Pins 40, 46, and 60 at the breakout box. |
| Result | Are all resistances greater than 10,000 ohms? |
| Direction | YES
Remove breakout box. Reconnect processor. GO to Continue NO Remove breakout box. Reconnect processor and knock sensor. Service open circuit. Rerun Quick Test. |
| 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 |
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