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

Switch - Base Engines Only


The oil pressure switch is installed only on the base engine vehicles.

Switch is normally closed at: 9.6 - 40 kPa (1.4 to 5.8 psi) measured on dropping pressure.

5 - 13 ohms @ 0 kPa (0 psi)
175 - 200 ohms @ 552 kPa (80 psi)