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

Oxygen Sensor Relay: Testing and Inspection

Electrical Checks at relay socket terminals

- Terminal-2, Battery voltage from fuse S-18

- Terminal-6, Battery voltage from ECM Power supply relay

- Terminal-4, Ground signal from ECM Terminal-28

- Terminal-8, Power output to Heated Oxygen Sensor connector Terminal-1

- Use wiring diagram to repair as necessary.