Lotus 2004 Eleven Service Notes page 167

Lotus Service Notes
Knock Control System
P0324 Knock Control System Error
P0327 Knock Sensor 1 Circuit Low
P0328 Knock Sensor 1 Circuit High
Description
The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The
piezoelectric element sends the signal to the ECU, when the cylinder block vibrates due to engine knocking.
If knock is detected then the ECU will retard the ignition to suppress it. The knock control sensor cannot dif-
ferentiate between spark knock and other similar sounding noises.
Sensor connections
Sensor Connector
1
2
Malfunction Criteria
P0327 – This code is set when the knock sensor signal is < 0.586 V
P0328 – This code is set when the knock sensor signal is > 2.928 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
Notes:
• The MIL will be illuminated if the fault is present for 2 consecutive trips.
• Further information on the sensor may be found inToyota 1ZZ-FE, 2ZZ-GE manual RM733E (B120T0327J)
pages DI-79 to DI-81
Page 24
P0324
P0327
P0328
Description ECU Pin
Sensor input 43 (C4)
Ground 13 (A4)
ECU Connector
52 Way (Right)
52 Way (Right)
Section EMP
'06 M.Y. in brackets