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

Power Supply/MFI Relay




CIRCUIT DIAGRAM





USING MULTI-USE TESTER


Steps 1-4:




HARNESS INSPECTION


Control Relay Inspection:




CONTROL RELAY INSPECTION



OPERATION

If the ignition "ON" signal is input, ECU flows electricity to the control relay coil to turn on the power supply switch. This circuit supplies power also to the injector, AFS, ISC servo, etc.