Materials:
* Multimeter
* Wire extensions (optional)
Steps:
1. Make sure it’s safe:
* Make sure the engine is off and the vehicle is in park mode.
* Disconnect the negative terminal of the battery.
2. Find the pressure sensor connector:
* Determine the location of the automatic transmission pressure sensor connector. It may vary depending on the car model. Usually located next to the automatic transmission itself.
3. Disconnect the connector:
*Press the connector latch and pull to disconnect it from the sensor.
4. Connect the tester:
* To test the pressure sensor, a multimeter with a resistance (ohms) function is required.
*Connect the red lead of the multimeter to the sensor’s power terminal (usually red or yellow).
*Connect the black lead of the multimeter to the ground terminal of the sensor (usually black or blue).
*If extension leads are used, connect them to the multimeter terminals first and then to the sensor.
5. Read the reading:
* Turn on the multimeter and switch it to resistance measurement mode.
* Typically, the automatic transmission pressure sensor has a resistance between 100 and 500 ohms. The exact value for your vehicle may vary.
6. Compare the readings:
*Compare the resistance reading with that specified for your vehicle.
*If the reading deviates significantly from the specified value, this may indicate a faulty sensor.
7. Repeat for the remaining contacts (optional):
*If there are additional pins on the sensor connector, repeat steps 4-6 for each pair of pins.
8. Replace the sensor (if necessary):
* If the inspection reveals a faulty sensor, replace it with a new manufacturer’s sensor.
Note:
* Not all automatic transmission pressure sensors can be checked with a multimeter. Consult your vehicle’s service manual for specific instructions.
* Pressure sensors can be two-wire or three-wire. For two-wire sensors, connect the multimeter to the power and ground terminals only. For three-wire sensors, also connect the multimeter to the signal wire (usually green).