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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Power Steering Pressure Switch: Description and Operation

A Power Steering Pressure (PSP) switch, located on the power steering pressure hose, is normally closed. As the power steering load increases, the PSP switch opens and signals the Powertrain Control Module (PCM) to increase the idle speed.