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)

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Oil Pressure Sensor: Testing and Inspection

The oil pressure switch is mounted to the engine beneath the lower manifold assembly. For diagnosis of the fuel pump relay circuit, refer to the Engine Cranks but Does Not Run. Refer to System Diagnosis / Procedures. Testing and Inspection