Error P1706 on cars Nissan is one of those diagnostic problems that can cause panic even in experienced drivers. This code is associated with malfunctions transmissions, or rather, with a breakdown in the connection between engine control unit (ECU) And transmission control unit (TCU). Depending on the model - be it Qashqai, X-Trail or Juke — manifestations of the error can vary from slight jerks when changing gears to a complete failure of the transmission to switch to higher gears.

Feature code P1706 is that it is often disguised as other faults, for example, due to errors in speed sensors or automatic transmission solenoids. This makes diagnostics difficult and leads to unnecessary expenses for replacing faulty parts. In this article, we will look at how to accurately identify the problem, what tools you will need to check, and what to do to fix the error without contacting the service - if possible.

What does error code P1706 mean on Nissan?

Code P1706 stands for Throttle Position Sensor Circuit Malfunction (throttle position sensor circuit malfunction) or, in context Nissan, more often than not Communication Error Between ECM and TCM - communication error between ECM (Engine Control Module) and TCM (Transmission Control Module). This means that the control units cannot communicate correctly, which leads to transmission malfunctions.

In practice, the error appears like this:

  • 🔴 Sudden jerks or delays when changing gears (especially from 1st to 2nd).
  • 🔴 The automatic transmission “freezes” in one gear or goes into emergency mode (Limp Mode).
  • 🔴The indicator lights up on the dashboard Check Engine or AT (Automatic Transmission).
  • 🔴 Loss of power, the car accelerates poorly.

It is important to understand that P1706 is not an independent fault, but a symptom. It can be caused either by a wiring problem or by a failure of one of the control units. For example, on Nissan Qashqai J10/J11 A common cause is oxidation of the contacts in the connector TCM, and on X-Trail T31/T32 — malfunction of the module itself.

📊 On which Nissan model did you encounter error P1706?
  • Qashqai
  • X-Trail
  • Juke
  • Murano
  • Other model

The main causes of error P1706

To effectively resolve an error, you need to understand its root cause. Here are the most common scenarios:

Reason Frequency of occurrence Nissan models where typical
Oxidation or damage to contacts in the connector TCM Very often Qashqai J10/J11, X-Trail T31
Control unit malfunction TCM Often Pathfinder R51, Murano Z50/Z51
Problems with wiring between ECM And TCM Average Teana J31/J32, Altima L32
Malfunction of the throttle position sensor (TPS) Rarely Juke F15, Note E12
Incorrect firmware ECM/TCM after chip tuning Rarely Any models after intervention in the ECU

For example, on Nissan Qashqai with engine MR20DE error P1706 often accompanied by code P0705 (automatic transmission range sensor circuit malfunction). This indicates a problem with the connector. TCM, which is located under the center console. At the same time on X-Trail with QR25DE the same error may mean failure of the module itself TCM, which requires its replacement or flashing.

⚠️ Attention: If the error P1706 appeared after washing the engine or heavy rain, with a high probability the problem is moisture getting on the contacts TCM. In this case, it is enough to dry and clean the connector - but this must be done carefully so as not to damage the contacts.

How to diagnose error P1706 yourself?

For diagnostics you will need OBD-II scanner (For example, Launch CReader or ELM327) and a multimeter. Here is a step-by-step algorithm:

  1. Count all errors. Besides P1706 there may be associated codes, e.g. P0700 (general transmission failure) or U1000 (loss of connection with TCM).
  2. Check connector TCM. On most models Nissan it is located under the center console or near the battery. Look for a gray or black block with the inscription TCM.
  3. Measure the voltage. On the connector TCM between contacts 12 (food) And 13 (weight) there must be 12 V. No voltage indicates a wiring break.
  4. Check the circuit CAN buses. Between contacts 6 (CAN-H) And 14 (CAN-L) there must be resistance 60–120 Ohm.

If you don't have experience with a multimeter, you can use an alternative method:

Inspect the TCM connector for oxidation or moisture|

Try to reset the error with a scanner and check if it appears again|

Check if the AT indicator on the instrument panel is on|

Make sure the battery is charged (low voltage may cause false errors) -->

On Nissan Qashqai J11 with CVT JF016E error P1706 often accompanied slipping of the variator. In this case, you need to additionally check the oil level in the transmission - its lack or contamination can provoke malfunctions. TCM.

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If, after resetting the error with the scanner, it returns after 5–10 minutes of driving, the problem is most likely in the hardware (wiring, connector, TCM itself). If the error disappears for a long time, a temporary communication failure is to blame, for example, due to poor contact.

Step-by-step instructions for resolving error P1706

Depending on the cause, repair methods will vary. Below are algorithms for the most common cases.

1. Cleaning and repairing the TCM connector

This is the simplest and most common scenario for Qashqai And X-Trail.

  1. Disconnect the battery (remove the negative terminal).
  2. Find TCM (usually under the center console or near the pedal assembly).
  3. Disconnect the connector and inspect the contacts. Oxidized or greened - clean with sandpaper (grit 600–800).
  4. Blow the connector with compressed air and treat the contacts contact lubricant (For example, Liqui Moly Kontaktreiniger).
  5. Connect everything back and reset the error with the scanner.

2. Replacement or repair of the TCM unit

If cleaning the connector does not help, and diagnostics show that TCM does not respond, it needs to be replaced or repaired. On models Nissan until 2015 TCM often fails due to overheating or corrosion of the board.

Options:

  • 🔧 Buy used TCM from disassembly (it is important to select by VIN code or part number).
  • 🔧 Give your unit for repair (many services resolder capacitors and microcircuits).
  • 🔧 Replace with a new one (original or analogue, for example, Hitachi or ZF).
⚠️ Attention: After replacement TCM on Nissan with the system NAT (Nissan Anti-Theft) may be required linking the unit to the immobilizer. Without this, the engine will not start. To bind, you need a diagnostic scanner with support Nissan Consult (For example, Launch X431).

3. Checking and repairing wiring

If the problem is a break or short circuit in the wires between ECM And TCM, proceed like this:

  1. Find the wiring diagram for your model (for example, in the manual Nissan FSM).
  2. Ring the circuit with a multimeter CAN-H, CAN-L, food And mass.
  3. If you find a break, restore the circuit by soldering or replacing the harness.
Where can I download wiring diagrams for Nissan?

Official diagrams can be found in service manuals Nissan FSM (Factory Service Manual). They are sold on sites like NicoClub or Nissan TechInfo (subscription required). For free access try the forums Drive2 or Nissan Club Russia, where users post excerpts from manuals.

Cost of repairs in the service vs self-repair

Error repair prices P1706 vary depending on the cause and region. Here are the approximate prices:

Type of work Cost in service (₽) Cost yourself (₽)
Diagnostics with a scanner 1 500 – 3 000 0 (if you have your own scanner)
Cleaning the TCM connector 2 000 – 4 000 200 (lubricant + sandpaper)
Replacing the TCM unit (used) 8 000 – 15 000 3 000 – 6 000
Wiring repair 3 000 – 7 000 500 – 1 500
TCM flashing 5 000 – 10 000 0 (if there is a programmer)

The most budget option is to clean the connector yourself. If replacement is required TCM, it is more profitable to buy a used unit and give it for binding to the immobilizer (this will cost less than buying a new one).

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On models Nissan with variator (CVT) ignoring the error P1706 may lead to overheating of the variator belt and its premature wear. Repairing a CVT will cost 50,000–150,000 rubles, so the error must be corrected promptly.

Common repair mistakes and how to avoid them

Many drivers, trying to save money, make mistakes that only aggravate the problem. That's what can't do:

  • 🚫 Reset the error by the scanner without eliminating the cause. It will return, and ignoring the problem will lead to wear and tear of the automatic transmission.
  • 🚫 Buy TCM from disassembly without inspection. The unit may be faulty or not match the firmware.
  • 🚫 Fill the variator with regular ATF oil. For Nissan CVT need special oil NS-2 or NS-3.
  • 🚫 Reflash TCM yourself without knowing the nuances. Incorrect firmware can “kill” the unit.

Another common mistake is Incorrect connector assembly after cleaning. For example, on Qashqai J11 contacts in the connector TCM are fixed with plastic latches. If they are broken, the connector will hang loose and the error will return.

Preventing error P1706 on Nissan

To minimize the risk of P1706, follow these guidelines:

  • 🔧 Regularly (every 60,000 km) change the oil in the automatic transmission/variator (for CVT - every 40,000 km).
  • 🔧 Avoid deep puddles and engine pressure washing - moisture may get into the connector TCM.
  • 🔧 At the first sign of jerking or delay when shifting gears immediately read errors with a scanner.
  • 🔧 If you are planning chip tuning, choose proven services - incorrect ECM/TCM firmware often leads to P1706.

On Nissan X-Trail T32 with CVT JF011E error P1706 often appears after a long drive in traffic jams. This is due to overheating of the variator. In such cases, installing additional CVT oil cooler.

FAQ: Frequently asked questions about error P1706

Is it possible to drive with error code P1706?

Short term - yes, but not recommended. Driving for a long time with this error can lead to wear of automatic transmission clutches or overheating of the variator belt. If the transmission goes into emergency mode (Limp Mode), speed will be limited to 40–60 km/h.

Why does P1706 appear after replacing the battery?

When the battery is disconnected, adaptive settings are reset TCM. If the unit was on the verge of failure, this may trigger an error. Also possible loss of connection due to a power surge. Solution: reset the error using the scanner and drive 10–15 km to “train” the transmission.

Could P1706 be caused by a faulty speed sensor?

No, P1706 not directly connected to the speed sensor. However, a faulty sensor may cause additional errors (For example, P0500), which complicate diagnosis. Eliminate first P1706, then check other codes.

How to reset TCM adaptations after repair?

To reset adaptations you need full TCM reset:

  1. Disconnect the battery for 10–15 minutes.
  2. Connect the scanner and clear all errors.
  3. Start the car and let it idle for 3-5 minutes.
  4. Drive 5-10 km with gentle acceleration and braking to “train” the transmission.

On some models (for example, Murano Z51) may be required special software to reset adaptations (for example, Nissan Consult).

Where to buy original TCM for Nissan?

Original blocks TCM you can order:

  • 🛒 From official dealers Nissan (expensive, but 1-2 year warranty).
  • 🛒 On spare parts websites: Exist.ru, Autodoc, Emex (search by VIN or part number).
  • 🛒 On disassembly (cheaper, but there is a risk of getting a faulty unit).

Please check before purchasing part number (for example, for Qashqai J11 with MR20DD it could be 31399-JM01A).