Power Steering Pressure Switch

POWER STEERING PRESSURE SWITCH:

OPERATION
- The power steering pressure switch converts presence/absence of power steering load into low/high voltage and inputs it to the engine control module, which then controls the idle air control motor based on this signal.
- The battery positive voltage in the engine control module is applied through a resistor to the power steering pressure switch. Steering operation causes the power steering fluid pressure to increase, turning the switch on. As a result, continuity is produced between the battery positive terminal and the ground. This causes the power steering fluid pressure terminal voltage to go from high to low.

Using Scan Tool:

Checking Fluid Pressure:

INSPECTION

HARNESS INSPECTION




STEP 1. Check for an open or short-circuit between the power steering pressure switch and the engine control module.
- Power steering pressure switch connector: Disconnected
- Engine control module connector: Disconnected
OK: GO TO STEP 2
NG: Repair the harness. (A1 - 54)




STEP 2. Measure the applied voltage.
- Power steering pressure switch connector: Disconnected
- Engine control module connector: Connected
- Ignition switch: ON
Voltage (V): Battery positive voltage
OK: STOP
NG: Replace the engine control module.