Nissan automatic transmission shift position sensor
Purpose:
The shift position sensor (PRNDL) tells the transmission control module (TCM) about the position of the shifter, which allows the TCM to select the correct gears.
Location:
The PRNDL sensor is usually located on the transmission housing or side cover.
Design:
The PRNDL sensor is a small electronic device with several contacts. It usually has the following contacts:
* Nutrition
* Grounding
* Signal contacts for each gear position
Working principle:
When the gear shift is moved to a certain position, the PRNDL sensor transmits a corresponding signal to the TCM. The TCM interprets this signal and selects the appropriate gear for the current driving conditions.
Possible faults:
A faulty PRNDL sensor can cause the following problems:
* Incorrect gear shifting
*Transmission stuck in one gear
*No gear shift
*Transmission fault indicator lights up
Diagnostics:
You can diagnose a faulty PRNDL sensor using a Diagnostic Trouble Code (DTC) scanner. The scanner can read DTCs stored in the TCM that indicate a possible PRNDL sensor failure.
Replacement:
If it is necessary to replace the PRNDL sensor, the following steps must be followed:
1. Disconnect the battery.
2. Determine the location of the PRNDL sensor.
3. Disconnect the electrical connector from the sensor.
4. Unscrew the sensor from the transmission housing.
5. Install the new sensor and tighten the bolts.
6. Connect the electrical connector to the sensor.
7. Connect the battery.
8. Clear DTCs and check transmission operation.
Notes:
* When replacing the PRNDL sensor, adjustments may need to be made using a scanner.
*Always follow the manufacturer’s instructions for removing and installing the sensor.
* It is recommended to replace the PRNDL sensor if there is any sign of transmission failure.