Owners Nissan Teana J32 Often faced with an unpleasant situation when the Check Engine indicator lights up on the dashboard, and the behavior of the car changes dramatically. The car may go into emergency mode, not change gears, or suddenly lose power when accelerating. In most cases the scanner will display an error code P1722, which indicates a malfunction in the speed sensor circuit.
This issue requires immediate attention as ignoring the signal may result in overheating automatic transmission (automatic transmission) and expensive repairs of the valve body or clutches. Code P1722 transmission specific Jatcoinstalled on models with engine 2.5 or 3.5 liters Understanding the nature of this error will help you save time and money when calling for service.
The essence of error P1722 and its impact on transmission operation
Code P1722 stands for "Signal of Vehicle Speed Sensor 2 (Output Shaft Speed)". The electronic transmission control module (TCM) no longer receives correct output shaft speed data. Without this information, the computer cannot calculate the moment of gear shifting, which leads to malfunctions of the box.
In the control system Nissan Teana J32 two speed sensors are used: input (Input Shaft Speed Sensor) and output (Output Shaft Speed Sensor). It is the output sensor that is responsible for transmitting data about the vehicle speed. If the signal from it disappears or becomes irregular, the system records an error and blocks the operation of some modes.
You may notice that the tachometer needle behaves unstable or shows incorrect values. This is a direct sign that electronic unit does not see the real position of the transmission parts. In some cases, the car may not move at all, remaining in neutral, even if the gearshift lever is in “D”.
The main causes of failure in the sensor circuit
The most common reason for the code to appear is P1722 is physical damage to the speed sensor itself. Over time, the sealant loses its properties, and transmission fluid or moisture gets inside the housing, causing oxidation of the contacts. As a result, the signal is interrupted.
An equally common problem is a break or short circuit in the wiring going to the sensor. On Nissan Teana J32 The wiring harness passes through an area of high temperatures and vibrations, which over time leads to chafing of the insulation. The contacts may oxidize due to moisture entering the connector.
- 🔌 Oxidation of contacts in the speed sensor connector due to oil or water.
- 🔥 Burnout of the sensor winding due to overheating of the engine and gearbox.
- 🧵 Mechanical damage to the wiring harness wires on adjacent body elements.
- 🧠 Control unit malfunction TCM, which is rare, but occurs in practice.
Sometimes the reason lies not in the electrics, but in the mechanics. If the gear ring from which pulses are read is damaged or contaminated with metal shavings, the sensor will not be able to correctly read the signal. This often occurs when there is significant wear on the internal parts of the gearbox.
Symptoms and behavior of the car in case of malfunction
When an error occurs P1722, behavior Nissan Teana J32 becomes very characteristic. The car may suddenly “hesitate” when changing gears, accompanied by a strong shock or loss of traction. This happens because valve body does not receive a command to switch.
Another striking symptom is the box going into “emergency mode” (Limp Home Mode). In this mode, the automatic transmission is locked in one gear, usually third or fourth. You will not be able to accelerate above 60-80 km/h, and the engine will operate at high speeds, making loud noise.
On the dashboard, in addition to the Check Engine light, the SLIP or the transmission light flashes. This is a signal that the stabilization system and transmission are not working correctly. Ignoring these signs can lead to complete failure of the box.
⚠️ Attention: If you notice that the car has stopped shifting gears and the P1722 error message has come on, stop using it immediately. Driving in emergency mode at high speeds can lead to overheating of the friction discs and their irreversible destruction.
- 2.5 l (VQ25DE)
- 3.5 l (VQ35DE)
- Other
- I don't know
Step-by-step diagnostic and troubleshooting procedure
The first step when you find an error is P1722 is to check the reading of fault codes. Connect a professional scanner or ELM327 adapter to the OBD-II connector and read the current and accumulated codes. Make sure the fault is P1722 and not P0720 (common output speed sensor code), although they often go together.
Visual inspection is the second important step. Locate the speed sensor on the body Automatic transmission. It is located on the top of the transmission, near where the shift lever mounts. Inspect the connector for traces of oil, oxides or mechanical damage.
☑️ Diagnosis of speed sensor P1722
For accurate diagnosis, you must use a multimeter. Disconnect the sensor connector and measure the resistance between the contacts. Normal resistance values for a speed sensor are Nissan Teana usually range from 500 to 1500 ohms (check your repair manual). If the resistance is infinitely high or equal to zero, the sensor is faulty.
Also check the integrity of the wiring from the sensor connector to the control unit. Use the multimeter's continuity mode. If you find a broken wire, it must be repaired or a section of the harness must be replaced. Pay attention to places where there are bends and friction against body elements.
How to check a sensor with an oscilloscope?
For professional diagnostics, you can use an oscilloscope. Connect the probes to the signal wire and ground. When the wheels rotate (on a lift), a sinusoidal signal should appear on the screen. The absence of a signal or its distortion confirms a malfunction of the sensor or mechanics.
If the electrical part is fine and the error persists, the problem may be inside the box itself. It is necessary to remove the sensor and inspect the magnetic tip. If it is covered with a thick layer of metal shavings, this indicates severe wear on the clutches or gears. In this case, simply replacing the sensor will not help.
Technical specifications and parameter table
For correct diagnosis and selection of a replacement, it is important to know the technical parameters of the output shaft speed sensor. Below is a table with the main characteristics that will help you distinguish a working item from a defective or counterfeit one.
| Parameter | Meaning | Note |
|---|---|---|
| Sensor type | Magnetoresistive / Inductive | Depends on the year of manufacture and box version |
| Winding resistance | 500 - 1500 Ohm | At 20°C |
| Supply voltage | 5 V (signal) | Powered by TCM |
| Location | Upper part of automatic transmission | On the side of the box body |
| Original article | 23731-1AA0A (example) | The part number may change, check by VIN |
When choosing an analog or original spare part, be sure to check the vehicle’s VIN code. On Nissan Teana J32 Various modifications of gearboxes were installed depending on the year of manufacture and the sales market. Using the wrong sensor may cause P1722 to reappear.
Before purchasing a new sensor, be sure to clean the old connector and check for moisture. Often the problem can be solved simply by drying and treating the contacts, which will save you money on purchasing spare parts.
The procedure for replacing the sensor and restoring functionality
Replacing the speed sensor with Nissan Teana J32 - The procedure is relatively simple, but requires care. You will need a set of wrenches, a new sensor and possibly some sealant. The vehicle must be placed on a level surface and the engine turned off.
Disconnect the battery terminal first to avoid short circuit. Find the sensor on the box body, disconnect the electrical connector by pressing the latch. Unscrew the sensor mounting bolt and carefully remove it from its seat. Be careful not to damage the O-ring.
Install the new sensor after lubricating the O-ring with transmission oil. This will ensure tightness and protection from dirt. Tighten the bolt firmly, but do not overtighten, as the sensor body may be made of plastic or soft metal.
- 🔧 Use a torque wrench to tighten the sensor bolt (usually 5-7 Nm).
- 🧽 Clean the installation site from old dirt and oil before installing the new element.
- 🔌 Check that the connector is securely connected - you should hear a clear click of the latch.
- 🔋 After assembly, do not forget to connect the battery and reset the errors with the scanner.
Correct installation of the O-ring and tightness of the connector is the key to ensuring that error P1722 does not return after a week of operation.
After installing a new sensor, the transmission adaptations must be reset. To do this, you can use a diagnostic scanner or perform a manual reset procedure (ignition voltage, gas pedal press). This will allow the control unit to relearn how to read signals from the new sensor.
Repairing wiring and eliminating contact problems
If the diagnostics showed that the sensor itself is working, but the problem is in the wiring, the harness will need to be repaired. On Nissan Teana J32 Often chafing of wires occurs at the point where they exit the corrugation or near the attachment of the harness to the body. Inspect the wiring all the way to the control unit.
To restore the wiring, use heat shrink tubing and high-quality insulation. The twists should be soldered and not simply clamped with electrical tape, as vibration can quickly destroy the contact. If the connector itself is damaged, it is better to replace it entirely by selecting a suitable analogue.
⚠️ Attention: Do not use ordinary adhesive tape connectors to repair engine and transmission wiring. Vibrations and temperature changes quickly lead to oxidation and loss of contact in such connections, causing the error to reappear.
Also check the grounding of the transmission control unit. Poor ground contact can cause false sensor alarms. Clean the place where the mass is attached from paint and rust, ensure tight contact with the bolt.
What should I do if P1722 comes back after replacement?
This could indicate a problem with the TCM or mechanical wear on the ring gear inside the box. In this case, in-depth diagnostics with an oscilloscope and disassembly of the automatic transmission are required.
Prevention and recommendations for use
To avoid the error P1722 in the future, carry out regular maintenance Nissan Teana J32. Change the transmission oil and filter in accordance with the manufacturer's instructions. Clean oil contaminates the sensor less and protects the electrical system from oxidation.
Whenever you wash your car, pay attention to the condition of the wiring harness and connectors in the engine compartment. If you notice cracks in the insulation or traces of oil on the connectors, take action immediately. Simply treating your contacts with contact spray can prevent serious damage.
Avoid aggressive driving and sudden throttle changes, especially on a cold engine. This reduces stress on the transmission and reduces vibrations that can lead to wire breaks. Timely diagnostics using a scanner when the slightest suspicious symptoms appear is the best way to preserve the resource of the box.
⚠️ Attention: Regularly checking the condition of the speed sensor connector (every 10-15 thousand km) can prevent expensive transmission repairs, since most problems are caused by oxidation of the contacts.
Remember that the error P1722 - this is not a sentence, but a signal about the need for attention to the electrical part of the transmission. With the right approach, the problem can be solved by replacing the sensor or repairing the wiring in one day.
Preventative inspection of wiring and connectors for signs of oil or oxidation is the most effective way to prevent P1722 and P0720 errors.
Frequently asked questions from Nissan Teana J32 owners
Is it possible to drive with error code P1722?
Drive with a mistake P1722 not recommended. The vehicle will go into limp mode, limiting speed and power. Long-term operation in this mode can lead to overheating and destruction of the automatic transmission clutches. It is better to eliminate the cause immediately.
How much does it cost to replace a speed sensor on a Teana J32?
The cost of the sensor itself varies from 2000 to 5000 rubles, depending on the manufacturer (original or analogue). The replacement job usually takes 30-40 minutes and is inexpensive as long as you don't change the wiring.
Is it possible to reset the error without a scanner?
You can reset the error by disconnecting the battery terminal for 15-20 minutes. However, if the fault is not corrected, the error will return after several engine starting cycles. To completely clear the error memory and reset adaptations, it is better to use a diagnostic scanner.
Which sensor is better to install: original or analogue?
Original sensor Nissan lasts longer and provides more accurate readings. However, high-quality analogues (for example, Denso) also work reliably and are cheaper. The main thing is to avoid cheap fakes from unknown brands.
Does P1722 affect engine performance?
The error concerns only the transmission, but due to incorrect operation of the box, the engine may operate in a non-optimal mode (high speed, lack of shifts). This increases fuel consumption and engine load.