Storm L4-1600cc 1.6L DOHC (1991)
The power steering pressure switch PSPS is normally open to ground, and GRN/YEL wire will be near the battery voltage. Turning the steering wheel
increases power steering oil pressure and its load on an idling engine. The pressure switch will close before the load can cause an idle problem. Closing
the switch causes GRN/YEL wire to read less than 1 volt. The ECM will increase the idle air rate and disengage the A/C relay. A pressure switch that
will not close, or an open GRN/YEL wire, may cause the engine to stop, when power steering loads are high. A switch that will not open or a GRN/YEL
wire shorted to ground, may affect idle quality and will cause the A/C relay to be de-energized.
TEST DESCRIPTION: Numbers below refer to the circled numbers on the diagnostic chart.
1.
Different makes of Scan tools may display the state of this switch in different ways.
2.
Checks to determine if GRN/YEL wire is shorted to ground.
3.
This should simulate a closed switch.
