Manifold Absolute Pressure (MAP) Sensor Wiring Diagram (PART 1)
NOTE: The above MAP sensor wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee.
The MAP sensor needs power and ground to create a MAP signal. The PCM is the one that provides power in the form of 5 Volts DC on the VIO/WHT wire.
The PCM is also the one that supplies ground to the MAP sensor on the BLK/LT BLU wire.
Here, in a nutshell is how the MAP sensor works:
- Once the MAP sensor is ‘On’ and the engine is running... it creates a decreasing voltage signal as the intake manifold vacuum increases (like when the engine is under load).
- Once the engine load is removed and intake manifold vacuum decreases (like when the engine is idling at a red traffic signal) the MAP sensor's MAP voltage signal increases.
For a step-by-step tutorial on how to test the MAP sensor, go here:
Manifold Absolute Pressure (MAP) Sensor Wiring Diagram (PART 2)
NOTE: The BLK/LT BLU wire feeds ground (from the PCM) to several sensors (including the MAP sensor).
Where to Buy the MAP Sensor and Save
The best place to comparison shop and get an idea of how much your Grand Cherokee's MAP sensors costs (and how much you can save) is here:
Not sure if the above MAP sensor fits your particular Jeep Grand Cherokee? Don't worry, once you get to the site, they'll make sure it fits by asking you the particulars of your vehicle. If it doesn't fit, they'll find you the right one.
If this tutorial was helpful/informative, you can find a complete list of tutorials here: Jeep 4.0L Index of Articles.
Here's a sample of the tutorials you'll find there: