XJ-S Convertible (XJ27) L6-4.0L (1996)
KS 2 Circuit Range / Performance A,B - P0331
When continuous knock detection on one or more cylinders has caused knock correction to reach it's maximum value and stay there for a
predetermined number of cycles, then there is a knock sensor circuit range /performance fault.
Possible causes:
-
Cylinder head overheats - loss of coolant
-
Wrong fuel type used - low octane
-
Cylinder deposits (on bank A,B)
-
Quiet engine with background noise spikes causing retard A,B
-
Radio Frequency Interference (RFI) affects knock signal - shielding problem with harness A,B
-
ECM fault - knock ASIC fails
KS Circuit Low Input
KS 1 Circuit Low Input A,B - P0327
KS 2 Circuit Low Input A,B - P0332
When the closed loop knock controller is unable to adjust the background noise average to within a defined band either side of the reference
background noise, then a knock sensor fault event has occurred. If the knock fault event counter reaches a given threshold, then a low or high
background noise knock fault is present.
Possible causes:
-
Knock sensor A,B not in good acoustic contact with block e.g. loose
-
Knock sensor wiring open circuit or short circuit to ground
-
Background anomalously quiet for a cylinder on that bank
-
Knock sensor signal attenuated - harness problem
-
Knock sensor fault A,B, lost sensitivity
-
ECM fault - knock ASIC failed
KS Circuit High Input
KS 1 Circuit High Input - P0328
KS 2 Circuit High Input - P O333
When the closed loop knock controller is unable to adjust the background noise average to within a defined band either side of the reference
background noise, then a knock sensor fault event has occurred. If the knock fault event counter reaches a given threshold, then a low or high
background noise knock fault is present.
Possible causes:
-
Background anomalously noisy for a cylinder on that bank
-
Radio Frequency Interference adds to knock signal - harness shielding problem
-
Knock sensor A,B - over sensitive
-
ECM fault - knock ASIC failed
Additional Information
Knock sensors use a piezo-electric sensing element to detect broad band (2 kHz to 20 kHz) engine accelerations.
Output of sensor:
Charge sensitivity = 37.5 pC/g nominal
Voltage sensitivity = 29 + 15 % mV/g