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
Power Steering Pressure (PSP) Switch:
The Power Steering Pressure
(PSP) switch signals the Powertrain Control Module
(PCM) whenever power steering pressure loads the power steering pump enough to significantly lower engine idle speed. The PCM is then able to compensate by raising idle speed.