Lotus Evora - Knock Control System

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Lotus Service Notes Section EMR
Knock Control System
P0327 Knock Sensor Circuit Low (Bank 1)
P0328 Knock Sensor Circuit High (Bank 1)
P0332 Knock Sensor Circuit Low (Bank 2)
P0333 Knock Sensor Circuit High (Bank 2)
Description
The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The
piezoelectric element sends continuously sends a signal to the ECU, when the cylinder block vibrates due to
engine knocking this signal increases. The ECU is able to identify each cylinder. If knock is detected then the
ECU will retard the ignition of the relevant cylinder to suppress it.
The knock control sensor cannot differentiate between spark knock and other similar sounding noises.
Sensor connections
Sensor Connector Description ECU Pin ECU Connector
1 Bank 1 Sensor input D1 48 Way (Centre)
2 Bank 1 Ground C1 48 Way (Centre)
3 Bank 2 Sensor input D2 48 Way (Centre)
4 Bank 2 Ground C2 48 Way (Centre)
Monitor:
• Continuous
Enable Criteria:
• Enginerunning
Malfunction Criteria:
• P0327–Thiscodeissetwhenthebank1knocksensorsignalis<0.586V
• P0328–Thiscodeissetwhenthebank1knocksensorsignalis>2.932V
• P0332–Thiscodeissetwhenthebank2knocksensorsignalis<0.586V
• P0333–Thiscodeissetwhenthebank2knocksensorsignalis>2.932V
Potential failure modes:
• Abnormalenginenoise,i.e.damagedengineorexhaustsystemcontactingvehicle
• Knocksensorfixingtootight
• Sensorconnector/wiringcorrodedorlooseconnections
• ECU
Diagnostic Mask:
• TheMILwillbeilluminatedifafaultispresentfortwoconsecutivetrips.
2009/02