P0325 · blink 52 – KNOCK SENSOR CIRCUIT MALFUNCTION

System: EFI 1ZZ-FE
Dashboard light: Malfunction indicator lamp (Check Engine)
Check-engine blink code: 52
Applies to: 1ZZ-FE 1.8 (PK Altis 2005-08 ZZE122; JDM ZZE122/124, Allex/Runx/Fielder 1.8)
Description: KNOCK SENSOR CIRCUIT MALFUNCTION
Detection / symptoms: Detection: No knock sensor signal to engine ECU with engine speed 1,280 rpm or more
Possible causes: Open or short in knock sensor circuit; Knock sensor (looseness; Engine ECU
What to check: Workshop check order (RM821E): CHECK HARNESS AND CONNECTOR -> INSPECT KNOCK CONTROL SENSOR -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−KNOCK CONTROL SENSOR)
Confidence: high (official Toyota RM821E)

From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights