This switch changes the behaviour of the automatic transmission; in the Power position, the transmission will shift up and down at higher engine speeds. In the comfort position, the upshift points will be limited, i.e. at Wide Open Throttle the shifts will not be at maximum engine RPM as they will be in Power position. The easiest way to demonstrate this is to drive on a highway at approximately 45MPH (70KPH) and force a kickdown (press the gas pedal to the floor). In Comfort mode, the transmission will shift down into third gear from fourth; in Power mode it will shift down into second gear. The difference is very noticeable. From 1991 onwards, the switch connection at the Transmission Control Unit (TCU) was hardwired in Power mode - no switch.
It is the part that connects the engine to the trans and transmits the power. It is between there.
Purchase a Haynes manual from an auto parts store.
use a test light with the alligator clamp attached to a ground and use the probe to test each side of the switch for power
Check the starter relay that is just behind the battery. The positive wire from the battery goes to it.
on my '96 grand Cherokee the door switch was not depressed enough. you can replace it by opening the door removing 2 screws on the switch pull it out unplug it put another one in and put it back together. If you cannot find another switch pull the switch loose and place a small flat washer behind the switch on top and bottom and screw back together.
The only differences are between a regular Cherokee and a Grand Cherokee.
It is the part that connects the engine to the trans and transmits the power. It is between there.
The 5.2 Liter V-8 is 230. Its built for torque
Purchase a Haynes manual from an auto parts store.
Fuel Filter? Air Filter?
The 1990 Jeep Grand Cherokee power locks wiring diagram can be obtained from most Jeep dealerships. The wiring diagram can also be found at most auto-parts stores.
Either near the hinge of the passenger door or under the hood in the main relay box near the battery.
Check the ground wire connection.
Loosen up the power steering pump and pull on pump till belt is tight.
Actuator worn out ? and need replacing
simple rule of car electronics: The black wire is ALWAYS ground
A very common problem is to have broken wires in the harness going to the driver side door.