Power Steering Load Switch

Power Steering Load Switch Circuit:

To test the Power Steering Switch, located on the P/S pump, proceed as follows.

COMPONENT TEST
1. Start the engine and warm to operating temperature.
2. Disconnect the power steering load switch (on the P/S pump).
3. Using an ohm meter check for continuity between the switch terminal and ground.

Continuity
Should not exist when the steering wheel is stationary.
Continuity
Should exist when the steering wheel is being turned.

HARNESS TEST
1. Disconnect the power steering pressure sensor connector and turn the key to the ON position.
2. Using a Voltmeter, check the Voltage between switch harness terminal 1 and ground.

Voltage:
System Voltage.

3. Turn the key to the OFF position, disconnect the negative battery cable and the ECU connector.
4. Using an ohm meter, check for continuity between ECU harness connector terminal 5 and switch harness connector terminal 1.

Continuity
Should exist.

5. Using an ohm meter, check for continuity between ECU harness connector terminal 5 and ground.

Continuity
Should not exist.


If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, road test the vehicle to confirm that the repair has corrected the problem.
If the same problem reoccurs, it is possible that there is an intermittent failure of the component or the ECU. Check for looseness at all harness junctions and test for an intermittent failure.