Knock Control System - Lotus Evora Service Notes

Lotus Service Notes

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
1 Bank 1 Sensor input
2 Bank 1 Ground
3 Bank 2 Sensor input
4 Bank 2 Ground
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.
Page 36
ECU Pin ECU Connector
D1 48 Way (Centre)
C1 48 Way (Centre)
D2 48 Way (Centre)
C2 48 Way (Centre)
2009/02
Section EMR