Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Knock Control System Check

KNOCK CONTROL SYSTEM CHECK

Check the knock sensor circuit if diagnostic trouble code, No.P0326, P0327 or P0328 is shown.

Refer to Multiport Fuel Injection (MFI) - Multiport Fuel Injection (MFI) Diagnosis - Diagnostic Trouble Code Chart. Diagnostic Trouble Code Descriptions