Power Steering Pressure (PSP) Switch

DESCRIPTION
The Power Steering Pressure (PSP) Switch is used on certain applications to signal the powertrain control module when the power steering pressure exceeds a specific limit. Then the powertrain control module will adjust idle speed to compensate for this added load on the engine. The PSP signal is used as an input to the powertrain control module to assist in determining proper Electronic Pressure Control (EPC) pressure during increased engine loads.

SYMPTOMS
- Failed ON- EPC slightly high, firm engagements, firm shifts, harsh coastdown shifts.
- Failed OFF- EPC pressure slightly low during increased loading of the vehicle power steering.

DTC's
P1650, P1651, P0552, P0553, P1550