### Tools Needed:
1. **OBD-II Scanner**: For reading and clearing codes.
2. **Multimeter**: For checking sensor voltages and resistances.
3. **Torque Wrench**: For reassembly to specification.
4. **Socket Set**: For removing and installing components.
5. **Wrenches**: Various sizes for disconnecting components.
6. **Safety Gloves and Goggles**: For personal protection.
7. **Shop Manual**: For specific torque specs and procedures.

### Safety Precautions:
1. **Disconnect the Battery**: Always disconnect the negative terminal to prevent electrical shorts.
2. **Work in a Well-Ventilated Area**: Ensure proper ventilation to avoid inhaling fumes.
3. **Wear Safety Gear**: Use gloves and goggles to protect against injury.
4. **Proper Lifting**: If working under the vehicle, use jack stands.

### Step-by-Step Procedure to Map the MAP Sensor:

#### Step 1: Locate the MAP Sensor
- **Location**: The MAP sensor in a Jeep Grand Cherokee WH WK is typically located on the intake manifold.
- **Access**: Remove any necessary components for clear access (engine cover, intake ducting).

#### Step 2: Disconnect the Electrical Connector
- **Procedure**: Gently pull back on the locking tab of the connector and disconnect the MAP sensor.

#### Step 3: Inspect the Sensor and Wiring
- **Visual Check**: Look for any signs of damage or corrosion on the sensor and wiring.

#### Step 4: Test the MAP Sensor
1. **Set Up the Multimeter**:
- Turn the multimeter to the voltage setting.
2. **Power On the Ignition**:
- Do not start the engine; just turn the ignition to the "On" position.
3. **Measure Voltage**:
- Connect the multimeter’s negative lead to ground and the positive lead to the MAP sensor’s signal wire.
- The voltage should typically be around 0.5V to 4.5V depending on engine vacuum.

#### Step 5: Map the Sensor
1. **Start the Engine**:
- Monitor the multimeter readings while the engine is running.
2. **Check Voltage at Different RPMs**:
- The voltage should change as RPM increases, indicating proper functioning.

#### Step 6: Reassemble
1. **Reconnect the MAP Sensor**:
- Ensure the connection is secure.
2. **Reattach Any Components Removed**:
- Use a torque wrench to tighten bolts to manufacturer specifications.
3. **Reconnect Battery**:
- Reattach the negative battery terminal.

#### Step 7: Clear Codes and Test Drive
1. **Use the OBD-II Scanner**:
- Clear any diagnostic trouble codes (DTC) and check for reoccurrence.
2. **Test Drive**:
- Observe vehicle performance and check for any error codes.

### Common Pitfalls to Avoid:
1. **Forgetting to Disconnect the Battery**: This can damage electrical components.
2. **Not Following Torque Specifications**: Over-tightening can break components.
3. **Ignoring Vacuum Leaks**: Ensure that all hoses are intact and connected properly.
4. **Failing to Clear Codes**: Old codes may mask current issues.

### Replacement Parts:
- If the MAP sensor is found to be faulty during testing, a replacement part will be required. Make sure to source a quality part that matches OEM specifications for proper function.

### Conclusion
By following these steps, you can effectively map the MAP sensor on a Jeep Grand Cherokee WH WK. Always refer to the specific shop manual for detailed specifications and procedures related to your vehicle model.
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