"No bus" means that the communications loop in your ride has been broken. From what I understand this is most likely due to a bad fuse, relay, or sensor. check your IOD fuse in the power distribution center.
Trouble code P1698 means: No CCD Messages Received From The TCM
Fuel injector #3 control circuit malfunction.
Trouble code P0174 means: System Too Lean (Bank 2)
Misfire code
This code refers to the front oxygen sensor
Camshaft position sensor malfunction.
Large evaporative emissions leak. Check the gas cap and all the lines going from the engine to the fuel tank.
what to do when the malfuction light comes on?
There is a malfunction in the "chip" key system.
That is the check engine light. It comes on when the engine computer detects an emissions related failure and sets a trouble code.
Trouble code P0734 means:Gear 4 incorrect ratio
A large EVAP leak, probably a faulty gas cap