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

System Troubleshooting

Fig. 28 Knock control system troubleshooting chart:





This troubleshooting, Fig. 28, is made for devices concerning the knock control system. Therefore this troubleshooting should be performed after first checking the distributor (pick-up coil, spark advances), the ignition coil, the spark plugs, and the high tension leads.