On the throttle body, right next to where the cable connects. It is the device on the right side with one or two wire connectors exiting at a right angle. The device on the left controls idle air.
It does not have a mass airflow sensor.
It is located at the driver's fender side of the the throttle body.
If you browse this website you will be able to find what you need: http://www.jeep4x4center.com/mopar/jeep-grand-cherokee/backup-parking-sensor.htm
The 1990 Jeep Cherokee electric fan relay switch is located on the firewall in the engine compartment. The fan relay switch will be on the passenger side of the firewall.
Under hood, center, upper engine area, mounted in driver side of water outlet
Below
The Jeep Grand Cherokee didn't exist until 1993.
It does not have a mass airflow sensor.
It is inside the distributor.
The tps (throttle position sensor) would be found on the throttle body, opposite side where the throttle cable is connected.
A 1990 Jeep Cherokee does not have a reset switch. The fuel system is computer controlled. If not functioning properly there could be a fuse or sensor malfunction.
The oil sensor is located above the oil filter next to the distributor.
above the filter
Inside the distributor.
The cam sensor is inside the distributor.
The 1994 Jeep Grand Cherokee IAT sensor can be found attached to the air intake hose. The IAT sensor will be near the air filter box.
It Is In The Gas Tank