There is a problem with the power steering pressure switch. The purpose of the switch is to sense the power steering hydraulic pressure in the steering gear assembly and then raise the engine idle rpm as more pressure is needed when you turn the wheels while the vehicle is idling. Your engine idle rpm will be dragged down when you turn the wheels while idling if it is not working properly. There is two wires in the harness to the switch connector, a black ground wire
and a blue/green striped signal wire which goes to the engine control module. You should check that connector because it can become either oil soaked or corroded, both conditions of which can cause a faulty connection. Cleaning the connector will most often remedy the problem but the switch itself may be faulty if there is no problem with the connector. The switch
is on the back side of the steering gear and can be easily located by looking for the wiring harness
which is routed to the steering gear assembly. It is the only electrical device on the steering gear assembly.
p1698- means the pcm is not recieving a bus message from the tcm. The vehicle
bus is one wire that runs to each module as there means of communication. This could be a broken wire, bad connection, or possibly a bad module. Unless your pretty sure about what your doing and have some good wiring diagrams you should probably take it to your dealer.