Error 1320 on Nissan Sunny: interpretation, causes and solutions

Error code 1320 on the instrument panel Nissan Sunny is one of those mysteries that can baffle even experienced car owners. In contrast to obvious malfunctions like P0300 (misfire), this code is rarely mentioned in standard manuals, and its appearance is often accompanied by unstable engine operation, jerks during acceleration, or even failure of comfort systems. If your Sunny (especially models N16, N17 or restyled versions) produces this code, it cannot be ignored - the consequences can range from increased fuel consumption to catalyst failure.

In this article we will not just decipher error 1320, but we’ll also analyze it unique reasons for Nissan Sunny, related to the features of the electronics and fuel system of this vehicle. You'll learn how to diagnose without a scanner, which sensors to check first, and why standard reset methods (like removing the battery terminal) often don't work here. And for those who prefer to solve problems with their own hands, we have prepared step-by-step instructions with photographs of key components and video examples.

What does error 1320 mean on Nissan Sunny?

Code 1320 in the self-diagnosis system Nissan belongs to the category production (not universal OBD-II), which complicates its interpretation. In most cases it signals inconsistency of signals from the throttle position sensors (TPS) and accelerator pedal (APP). However, on Sunny with engines QG15DE, QG18DE or HR15DE this code may mask other problems:

• 🔧 Mechanical wear throttle cable or play in the damper drive.
• 🔌 Oxidation of contacts in sensor or ECU connectors (especially after washing the engine compartment).
• 📉 Unstable voltage in the on-board network (for example, due to a dead battery or generator).
• 🛠️ Software glitch in the firmware of the engine control unit (ECU), typical for cars with mileage over 150 thousand km.

It is important to understand that 1320 - this is not a direct indication of a breakdown, but rather symptom desynchronization of systems. For example, if the sensor TPS shows 20% throttle opening, and the sensor APP — 30%, the ECU detects a conflict and issues an error. In practice this manifests itself as:

• ⚡ Reaction delay when pressing the gas pedal (especially on a cold engine).
• 🔄 Spontaneous increase in speed up to 1500–2000 rpm at idle.
• 🚗 Jerks when shifting gears (on models with automatic transmission RE4F03B).

Reasons for error 1320: from simple to complex

To effectively eliminate 1320, you need to systematically check all possible sources of the problem. Let's start with the most probable and easily eliminated causes, gradually moving on to complex ones.

1. Throttle problems

On Nissan Sunny The damper often becomes dirty due to low-quality fuel or oil dust from the crankcase ventilation system. This leads to:

• 🔹 Jamming mechanism (especially in cold weather).
• 🔹 Uneven wear resistive layer of the sensor TPS.

How to check: Remove the air duct pipe and visually inspect the damper. If there is a black coating on the walls, cleaning with a carburetor cleaner (for example, Abro Carb Cleaner).

2. Sensor malfunctions

Sensors TPS And APP - the main "suspects". Their diagnostics include:

1. Checking the resistance with a multimeter (for TPS norm: 0.5–4.5 kOhm with smooth damper movement).
2. Monitoring the voltage at the connectors (must be 5V from the ECU).

Please note: on Sunny N17 sensor APP often fails due to moisture entering through a damaged gas pedal seal.

3. Problems with wiring and ground

Oxidized contacts or breaks in wiring harnesses are a classic problem for cars older than 10 years. Particularly vulnerable:

• 🔌 ECU connector (located under the glove compartment).
• 🔌 Ground connection on the engine (next to the starter).

4. Failures in the ECU firmware

If all mechanical and electrical components are in order, but an error 1320 continues to appear, the software may be to blame. This is true for cars after chip tuning or with “crooked” firmware from unofficial services. The solution is to flash the ECU with original software via Consult-III Plus or Nissan DataScan.

Reason	Symptoms	Remedy
Dirty throttle valve	Floating speed, jerking during acceleration	Cleaning with carburetor cleaner
Faulty TPS sensor	Error 1320 + code P0120/P0122	Replacing the sensor (article: 22630-4M000)
Oxidation of ECU contacts	Multiple errors, unstable engine operation	Contact cleaning, lubricating
ECU firmware failure	The error appears after chip tuning	Flashing with original software

How to reset error 1320 on a Nissan Sunny: step-by-step instructions

If you have eliminated the cause of the malfunction, the error must be reset. On Sunny this can be done in several ways - from simple to “surgical”.

Method 1: Reset via battery

The most common method, but it doesn’t always work. Algorithm:

1. Turn off the ignition.
2. Remove the negative battery terminal for 10–15 minutes.
3. Reconnect the terminal and start the engine.

If the error 1320 returned - the cause has not been eliminated or a deeper reset is required.

Method 2: Reset via diagnostic connector

To do this you will need a scanner (for example, ELM327 with the program Torque Pro) or error reset button (if provided in your version Sunny). Sequence:

1. Connect the scanner to the connector OBD-II (located under the steering wheel).
2. From the menu, select “Erase Errors” (Clear DTC).
3. Stop the engine and remove the key from the lock for 30 seconds.
4. Start the car and check if the error appears again.

Method 3: Manual reset via ECU (advanced)

If there is no scanner and the error does not clear, you can try to “reset” the ECU adaptations manually:

1. Remove the fuse ECU-IG (located in the fuse box under the hood, number F15, 10A) for 5 minutes.
2. Reinstall the fuse.
3. Start the engine and let it idle for 3–5 minutes (the ECU will “learn” the sensor parameters again).

What should I do if the error returns after a reset?

If code 1320 appears again, the problem is not resolved. In 80% of cases, the TPS or APP sensor is to blame and needs to be replaced. Also check the ECU power supply circuit (fuse F15 and relay R12).

TPS and APP Sensor Diagnostics: A Detailed Guide

Throttle position sensors (TPS) and accelerator pedals (APP) are critical elements, and their failure almost always results in an error 1320. Let's figure out how to check them without expensive equipment.

Checking the TPS Sensor

Sensor TPS on Nissan Sunny located on the throttle body. For diagnostics:

1. Disconnect the sensor connector (bend the latch with a screwdriver).
2. Connect the multimeter in resistance measurement mode to the contacts 1–2 And 2–3 (see diagram below).
3. Smoothly open the damper manually - the resistance should change from 0.5 to 4.5 kOhm without jumps.

If the device shows a break or short circuit, the sensor must be replaced. Original article: 22630-4M000 (cost ~1500–2500 rub.).

APP sensor check

Gas pedal sensor (APP) on Sunny often fails due to mechanical wear. You can check it like this:

1. Remove the plastic trim under the steering wheel to access the sensor.
2. Disconnect the connector and check the voltage between the contacts 1–4 (should be 5V when the ignition is on).
3. Press the gas pedal - voltage on the contacts 2–4 And 3–4 should change smoothly from 0.5 to 4.5V.

If the voltage fluctuates or is absent, the sensor is faulty. Original article: 22630-AL50A.

Common repair mistakes and how to avoid them

Many car owners trying to fix 1320, make typical mistakes that only aggravate the problem. That's what it's impossible do:

⚠️ Attention! Never clean the throttle body with a wire brush or sandpaper - this will damage the special coating and lead to incorrect operation of the sensor. TPS. Use only soft wipes and specialized cleaners.

• 🚫 Ignore ground check. Poor contact on the negative wire of the ECU can simulate a sensor failure.
• 🚫 Install non-original sensors. Cheap analogues often have incorrect calibration, which leads to the reappearance of the error.
• 🚫 Reset the error without eliminating the cause. This may cause the ECU to go into emergency mode with power limitation.

Another common mistake is incorrect throttle adaptation after cleaning or replacement. On Nissan Sunny with electronic gas pedal (E-Throttle) training procedure required:

1. Stop the engine and turn off the ignition.
2. Press the gas pedal all the way and hold for 10 seconds.
3. Turn on the ignition (do not start the engine!) and wait until the indicator Check Engine will not start flashing.
4. Release the pedal and start the car.

When to contact service: signs of serious problems

Not all faults cause an error 1320, you can fix it yourself. There are symptoms for which it is better to go to a car service immediately:

• 🔥 The engine goes into emergency mode (rev limit to 3000, enabled Check Engine).
• ⚡ Additional errors appear (For example, P0100 - DMRV malfunction or P0335 — crankshaft position sensor).
• 💻 The scanner shows “loss of communication with the ECU” (No Communication).
• 🔧 After replacing the sensors the error returns - this may indicate problems with the firmware or hardware malfunction of the control unit.

The service uses professional scanners for diagnostics (Nissan Consult), which show not only error codes, but also real-time sensor parameters. For example, you can see that the signal with TPS “floats” even when the damper is stationary - this is a direct indication of a malfunction.

⚠️ Attention! If, after resetting the error, the engine is unstable (troits, stalls), turn it off immediately! This may be a sign of incorrect calibration of the sensors, which will lead to damage to the catalyst.

Prevention of error 1320: how to avoid recurrence

To make a mistake 1320 did not return, follow these recommendations:

• 🔧 Clean the throttle body regularly (every 30–40 thousand km).
• ⚡ Monitor the voltage of the on-board network (norm: 13.8–14.4V with engine running).
• 🛢️ Use quality fuel (octane number not lower than 95).
• 🔌 Check the ECU contacts periodically (especially after washing or rain).

It is also useful to carry out once a year diagnostics with a scanner, even if there are no visible problems. This will help identify “incipient” sensor faults at an early stage.

FAQ: Frequently asked questions about error 1320 on Nissan Sunny

Is it possible to drive with error 1320?

Short term - yes, but not recommended. The error indicates a desynchronization of systems, which can lead to increased fuel consumption, jerking and even breakdown of the automatic transmission (on automatic transmissions). If the error appears for the first time, try to eliminate it within 1–2 days.

Why does error 1320 appear after washing the engine?

Most likely, water got into the sensor or ECU connectors, causing a short circuit. It is necessary to dry the contacts (you can use a hairdryer) and treat them with grease for electrical connections. If the error does not disappear, check the integrity of the wire insulation.

How to distinguish a faulty TPS from problems with the APP?

If there is a faulty TPS speed usually “floats” at idle, and if there are problems with APP — the engine does not respond to the gas pedal or responds with a delay. Accurate diagnostics can only be carried out with a scanner by monitoring sensor signals in real time.

Is it possible to reset error 1320 without a scanner?

Yes, by removing the battery terminal or ECU fuse (described above). However, if the cause is not eliminated, the error will return. A scanner is needed for accurate diagnosis.

How much does it cost to repair error 1320 in the service?

The cost depends on the reason:

• Cleaning the throttle valve: 1000–1500 rubles.
• Replacing the TPS/APP sensor: 2000–4000 rub. (with work).
• Diagnostics + ECU flashing: 3000–6000 rub.

On average, fixing an error costs RUB 2,000–5,000.