When faced with a sudden automatic transmission going into limp mode, Nissan Teana J32, owners often see the Check Engine light on the dashboard. The most common fault code in this situation is P1722. This message indicates a critical problem in the torque converter input shaft speed sensor circuit or the sensor itself, preventing the transmission from operating correctly.
Ignoring this signal is unacceptable, since the electronic transmission control system Nissan Jatco blocks gear shifting to prevent mechanical destruction of internal components. The driver notices that the car does not accelerate above a certain speed, usually around 40-60 km/h, and shifts occur with sharp impacts or are absent altogether. Understanding the Nature of the Error P1722 - the first step to restoring your performance Nissan Teana.
The essence of the malfunction and the operation of the speed sensor
Code P1722 in technical documentation Nissan stands for "Input shaft speed (turbine speed sensor) - open circuit or short circuit." The turbine speed sensor, located on the transmission housing, is responsible for transmitting information about the speed of rotation of the input shaft to the TCM.
Without this data, the electronic unit cannot calculate the exact gear shift time and the required pressure in the solenoids. As a result, the system goes into protection mode. It is important to understand that the problem may lie not only in the sensor itself, but also in the wiring going to it or in the connection connector.
The operating mechanism is based on the Hall effect: when a toothed disk rotates, the sensor generates pulses. If the signal disappears or becomes irregular, the controller records an error. Diagnostics should begin with checking the presence of a signal, and not with the immediate replacement of expensive components.
The main causes of error P1722
Owners Nissan Teana J32 with VQ25DE and VQ35DE engines they encounter this problem quite often. There can be several reasons and they range from simple electrical failures to serious mechanical failures.
The most common culprit is failure of the speed sensor (Input Speed Sensor). Over time, the magnet inside the element loses its properties or the internal winding burns out. Oxidation of the contacts in the connector chip is also often observed due to moisture or oils.
- 💥 Complete breakage of wiring inside the harness due to vibration or thermal effects
- 💥 Oxidation or contamination of contacts in the speed sensor connector
- 💥 Failure of the sensor itself (magnetic or resistive type)
- 💥 Malfunction of the transmission control module (TCM) - less common
Less commonly, the cause is mechanical damage to the toothed disk on which the pulses are read. If the disk is warped or contaminated with metal shavings, the sensor will not be able to correctly read the rotation speed, which will also cause a code to appear. P1722.
Diagnostics and testing of the electrical circuit
Before you run to the store for spare parts, you need to conduct a thorough diagnosis. Start by visually inspecting the speed sensor connector located on the top of the transmission. Often the problem lies in banal oxidation of the contacts, which is easily eliminated by cleaning.
Use a multimeter to check the sensor resistance. Typically it should be in the range from 200 to 1000 Ohms, but it is better to check the exact values in the service documentation for a specific model. If the multimeter shows “infinity” or zero, the sensor is definitely faulty.
It is also necessary to check the integrity of the wiring from the sensor connector to the control unit connector. Breaks often occur at bends in the harness or where the wire touches hot parts of the engine. Do not forget to check the presence of supply voltage at the connector with the ignition on.
⚠️ Attention! Before starting any measurements, be sure to disconnect the negative terminal of the battery to avoid short circuit and damage to the control unit Nissan.
If the electrical circuit is normal and the sensor is working, you should pay attention to the condition of the oil in the gearbox. Excessive metal shavings can clog the sensor and interfere with its operation. In this case, it is necessary not only to replace the sensor, but also to completely flush the valve body and change the oil.
- Up to 100,000 km
- 100,000 - 200,000 km
- More than 200,000 km
- Mileage unknown
Step-by-step instructions for replacing the sensor
Replacing the speed sensor with Nissan Teana J32 - a procedure that can be performed independently if you have a basic set of tools and access to a lift or pit. The process does not require removing the gearbox, which greatly simplifies the task.
First you need to remove the air filter and air filter housing to gain clear access to the top of the transmission. The speed sensor is located closer to the rear of the automatic transmission, on the right side (when viewed in the direction of travel).
☑️ Preparing to replace the sensor
Next, disconnect the electrical connector by pressing the latch. Unscrew the sensor mounting bolt and carefully remove it. Be prepared for the fact that a little oil may leak out of the seat - place a rag. Install the new sensor after lubricating the O-ring with clean transmission oil.
After installation, tighten the mounting bolt to the recommended torque (usually about 5-7 Nm), connect the connector and reassemble everything in reverse order. Do not forget to check the oil level in the gearbox after the work has been carried out.
⚠️ Attention! Never use sealant instead of the standard O-ring! This can lead to oil leaks and subsequent overheating of the gearbox.
Error reset and adaptation after repair
After replacing the sensor and eliminating the malfunction, the code P1722 may remain in the controller's memory. Simply disconnecting the battery often does not help, since the control unit stores “remembered” errors. It is necessary to carry out the reset procedure using a diagnostic scanner.
Connect the OBDII scanner to the diagnostic connector located under the steering column. Go to the Engine Management or Transmission menu and select the Erase Trouble Codes option. After the reset, turn off the ignition for 10-15 seconds.
Then start the engine and let it idle until the cooling fans turn on. This is necessary for the control unit to carry out the initial adaptation of the gearbox operating parameters. If no error is returned, the problem is resolved.
What should I do if error P1722 returns immediately?
If the error appears again immediately after a reset, then the problem is not in the sensor, but in the wiring or control unit. Check the harness for breaks, and also check the supply voltage to the sensor. In rare cases, the TCM may need to be flashed or replaced.
In some cases, a switch training procedure may be required. This is done by cyclically moving the car: accelerating to 60 km/h, stopping, accelerating again. Repeat this cycle 5-10 times. This will help the solenoids adapt to new conditions.
Speed sensor characteristics table
For accurate diagnostics, it is important to know the technical parameters of the standard sensor. Below are the average characteristics for the models Nissan Teana J32 with Jatco automatic transmission.
| Parameter | Meaning | Units of measurement |
|---|---|---|
| Sensor type | Magnetoresistive/Hall effect | - |
| Winding resistance | 200 - 1000 | Ohm (O) |
| Supply voltage | 5.0 | Volt (V) |
| Connector | 3-pin (black) | - |
| Location | Upper part of gearbox, right side | - |
Please note that parameters may vary slightly depending on the year of the vehicle and the specific sensor manufacturer (OEM or equivalent). Always check the technical documentation before purchasing.
Selection of spare parts and analogues
When selecting a speed sensor for Nissan Teana J32 It is best to give preference to original spare parts. The OEM number usually starts with 33700 or 33701. Original sensors ensure stable signal transmission and long service life.
There are also high-quality analogues on the market from such manufacturers as NTK, Sachs or Denso. However, cheap Chinese analogues may have unstable resistance characteristics and quickly fail, which will lead to the recurrence of the error P1722.
- ✅ Original Nissan sensor - high reliability, accurate parameters
- ✅ NTK/Denso analogues - good value for money
- ❌ Cheap unknown brands - the risk of repeated breakdown as soon as possible
When purchasing, be sure to check the integrity of the packaging and the presence of protective films on the contacts. The sensor is a sensitive electronic component that can be easily damaged if improperly stored or transported.
Tip: When replacing the speed sensor, replace the O-ring at the same time. The old ring may be deformed and will not provide a tight seal, which will lead to oil leakage.
If you are not confident in your abilities or do not have diagnostic equipment, it is better to entrust the work to professionals. Incorrect diagnosis can lead to replacement of serviceable components and unnecessary costs. However, knowing the basics of diagnostics will help you control the repair process and not be deceived in the service.
Regular checking of the level and condition of the oil in the automatic transmission, as well as timely diagnostics of electrical circuits, can prevent the occurrence of error P1722 and extend the life of the gearbox.
⚠️ Attention! Error P1722 on a Nissan Teana J32 is most often caused by a failure of the sensor itself, and not by a mechanical failure of the box, so replacing the sensor solves the problem in 90% of cases.
Frequently asked questions from owners
Is it possible to drive with error code P1722?
Driving with this error is highly not recommended. The car will be in emergency mode, not accelerating above 40-60 km/h. This creates an emergency situation when overtaking or driving on the highway. In addition, constant jerking can damage the automatic transmission clutches.
How much does the speed sensor cost on Teana J32?
The price of the original sensor varies from 3,000 to 6,000 rubles, depending on the store. Analogues are cheaper, from 1500 to 3000 rubles. The cost of replacement work in the service is usually 1000-2000 rubles.
Do both speed sensors need to be replaced?
No, with error P1722, only the input shaft (turbine) sensor is changed. The output shaft sensor (vehicle speed sensor) has its own error code (usually P1721 or P1723) and they change independently of each other.
Does resetting the error help without replacing the sensor?
Temporarily removing the battery terminal or resetting with a scan tool may clear the error for a short time, but if the faulty sensor is not replaced, the error will return almost immediately after starting to drive, as soon as the control unit checks the signal.
Can I use sealant during installation?
Absolutely not. The sensor must be installed on the standard O-ring. Using sealant can cause it to get inside the transmission, causing clogging of the solenoids and valve body.