Error appears P1705 on the on-board computer Nissan Pathfinder generation R51 often becomes a real test for the owner. This fault indicates a malfunction of the throttle position sensor (TPS) or, in some cases, problems with the accelerator pedal control circuit. Without timely intervention, the car can go into emergency mode, significantly limiting engine power and creating danger when driving on the highway.
Engine management system Nissan VQ40DE, installed on this model, is extremely sensitive to signals about the throttle position. If the electronic control unit (ECU) does not receive correct data or sees a discrepancy between the position of the gas pedal and the throttle, it sets a code P1705. Ignoring this problem can lead to unstable engine idling, jerking during acceleration and increased fuel consumption.
The essence of the malfunction and error code P1705
Code P1705 in technical documentation Nissan interpreted as “Throttle Position Sensor Circuit High Input” or “TPS Circuit Range/Performance”. In simple words, the computer sees that the voltage from the sensor exceeds the permissible limit or there is no signal at all. This does not always mean a physical breakdown of the sensor itself; often the problem lies in the electrical circuit.
It is important to understand that Nissan Pathfinder R51 an electronic throttle (Drive-by-Wire) is used. There is no mechanical connection between the pedal and the damper. Instead, two sensors are used: one on the accelerator pedal and two on the throttle body itself. The control unit constantly compares their readings. If they diverge by more than 10-15%, the system records an error and turns on the “Check Engine”.
A common cause of the error is oxidation of contacts in connectors or broken wires in the harness going from the throttle assembly to the computer. It is also worth paying attention to the quality of the sensor itself, since factory defects can appear even on relatively new cars.
The main causes of error P1705
There are several key factors that trigger the diagnostic system and record a code. P1705. The first step is to check the condition of the throttle position sensor. Over time, its internal part (the rheostat) wears out, leading to voltage surges and loss of signal.
The second most popular reason is a wiring problem. Engine vibrations and exposure to high temperatures can lead to chafing of the insulation or corrosion of the contacts in the connector. This is especially true for regions with an aggressive climate or frequent temperature changes.
- 🔌 Oxidation or contamination of contacts in the throttle assembly connector.
- 📉 Worn tracks inside the TPS sensor potentiometer.
- ⚡ Open circuit or short circuit in the sensor power supply circuit (5 Volts).
- 🧠 Engine control unit software failure (rare).
Symptoms of a car malfunction
When an error P1705 recorded in memory, behavior Nissan Pathfinder R51 is changing dramatically. The most noticeable sign will be the indicator turning on Check Engine on the dashboard. However, it is often accompanied by other symptoms that are difficult to ignore while driving.
The engine may begin to operate unstably at idle, the speed will “float” or the engine may stall when trying to move away. When you press the gas pedal, the car reacts with a delay or does not pick up speed at all, remaining at low values (Limp Home mode or emergency mode).
In some cases, increased fuel consumption is observed as the ECU tries to compensate for incorrect data by supplying a rich mixture. The driver may also feel jerks and kicks when changing gears, as the automatic transmission loses synchronization with the engine operating mode.
⚠️ Attention: If the car goes into emergency mode, driving on the highway becomes dangerous due to the inability to quickly accelerate to overtake. You must immediately stop in a safe place and carry out diagnostics.
Stages of self-diagnosis and verification
To identify the exact cause of the error P1705 You need a multimeter and access to the connectors. Start by visually inspecting the wiring harness leading to the throttle body. Look for melt marks, cracked insulation, or traces of oil in the connectors.
Then you need to check the sensor supply voltage. Disconnect the connector from the throttle body and turn on the ignition. A stable voltage of 5 volts should be present at the connector contacts. If the voltage is absent or fluctuates greatly, the problem lies in the wiring to the ECU or in the control unit itself.
- 🛠️ Check the resistance of the TPS sensor at different throttle positions.
- 📊 Make sure that the signal at the sensor output changes smoothly without jumps.
- 🔍 Inspect the throttle actuator rod for mechanical jams.
- Constantly
- Sometimes after startup
- After washing the engine
- Never, just guessing
Troubleshooting Methods
If diagnostics show that the problem is in the sensor itself, the only reliable solution is to replace the entire throttle assembly or, in rare cases, replace only the sensor if it comes as a separate unit (on Pathfinder R51 more often the entire assembly changes). Attempts to clean or repair the potentiometer usually have only a temporary effect.
If the reason is in the wiring, it is necessary to restore the integrity of the circuits. The breaks should be soldered and carefully insulated, and the oxidized contacts should be cleaned and treated with a special lubricant. After restoring the circuit, be sure to check the reliability of all connections.
After physically eliminating the cause of the error, it is necessary to carry out the adaptation reset procedure. Simply disconnecting the battery terminal may not help, since the control unit stores errors in non-volatile memory. Requires the use of a diagnostic scanner.
☑️ Throttle valve repair procedure
Adaptation and error reset procedure
After replacing or repairing components, the system must be trained. Without proper adaptation P1705 may come back again, or the machine will not work correctly. The learning process includes resetting the throttle body via the OBD-II diagnostic connector.
If you don't have a professional scanner, you can try the procedure manually, but it doesn't work on all versions of the software. Sequence of actions: turn off the ignition, wait 10 seconds, turn on the ignition, wait 3 seconds, press the gas pedal 5 times in 5 seconds, turn off the ignition and wait 10 seconds.
For a guaranteed result, it is recommended to contact specialists who have access to the software Nissan Consult. This will allow you to fine-tune the damper's operating parameters and make sure that all parameters are normal.
Prevention and recommendations for use
To avoid the error reappearing P1705, the throttle assembly should be regularly maintained. Once every 30-40 thousand kilometers, it is recommended to remove the unit and clean it of carbon and oil deposits using a special carburetor cleaner.
It is also important to monitor the condition of the air filter. If it is clogged or of poor quality, unfiltered air can enter the engine, accelerating wear on throttle body parts and sensors. Regular filter replacement is the key to long-term operation of the intake system.
- 🛡️ Use only high-quality consumables for maintenance.
- 🧹 Regularly clean the throttle assembly from dirt.
- 🔋 Monitor the condition of the battery and network voltage.
| Parameter | Normal value | Meaning for error P1705 | Action |
|---|---|---|---|
| Supply Voltage (VCC) | 4.5 – 5.5 V | 0 V or > 6 V | Check wiring and ECU |
| TPS1 signal (open damper) | 0.3 – 0.8 V | > 4.0 V | Replace sensor or assembly |
| TPS2 signal (open damper) | 0.3 – 0.8 V | TPS1 mismatch | Replacing the unit |
| Circuit resistance | < 1 Ohm | Infinity (break) | Harness repair |
Before purchasing a new throttle body, be sure to check compatibility using your vehicle's VIN code, as there are different revisions for V6 engines.
⚠️ Warning: Do not attempt to force open the throttle or disable the sensors while driving. This can lead to complete loss of control and an accident.
What happens if you ignore the error? If you ignore the P1705 error, the car may completely cut off the fuel supply when you release the gas, which is dangerous on high-speed sections of the road. It is also possible for the catalytic converter to fail due to an over-enriched mixture.
Cost of repairs and selection of spare parts
Cost of fixing the error P1705 depends on the chosen repair method. If the problem is solved by cleaning the contacts or restoring the wiring, the costs will be minimal (cost of materials and electrician's work). If the throttle assembly is replaced, the price increases significantly.
Original throttle assembly for Nissan Pathfinder R51 It is quite expensive, so many owners are considering replacement options for high-quality analogues. However, you should be careful
Cheap Chinese copies often have low sensor accuracy and can fail after a few thousand kilometers.
The best solution is to purchase an original part or proven analogues from well-known brands, such as Denso or Mitsubishi (suppliers for Nissan). This will ensure long and reliable operation of the engine management system.
Is it possible to drive with error code P1705?
Technically possible, but highly not recommended. The car will go into emergency mode, losing power. Driving on the highway will become dangerous due to the impossibility of sudden acceleration. In addition, operating the engine in the wrong mode can damage the catalyst.
How often should you clean the throttle body on a Nissan Pathfinder R51?
It is recommended to carry out cleaning every 40-60 thousand kilometers, or when symptoms of unstable idling appear. Regular maintenance will extend the life of throttle position sensors.
Can I reset error P1705 myself?
Yes, you can try to reset the error by disconnecting the battery terminal for 15-20 minutes, but this is not always effective. The control unit can store the error in non-volatile memory. The best way is to use an OBD-II diagnostic scanner to clear the error memory and perform an adaptation.
Why does the error return after a reset?
If the error returns immediately or a short time after resetting, it means that the problem has not been physically corrected. This could be a broken wire, a faulty sensor, or a problem with the control unit. It is necessary to conduct in-depth diagnostics of the circuit.
Does fuel quality affect the occurrence of error P1705?
Indirectly affects. Low-quality fuel contributes to the formation of more carbon deposits in the combustion chamber and on the throttle valve. This can cause the throttle to become stuck and cause incorrect sensor readings, eventually causing the P1705 code.