Nissan Sunny error codes: how to decipher and troubleshoot problems

Nissan Sunny - one of the most popular models of the Japanese brand, produced from 1966 to 2006 in various bodies (B13, B14, N14, N15, N16). Despite their reliability, even these machines are not immune to breakdowns. When the dashboard lights up check engine or other warning signals appear, the first thing to do is consider error codes and interpret them correctly.

In this article we have collected a complete database of fault codes for Nissan Sunny of all generations, including engines GA14DE, GA16DE, SR20DE, as well as automatic and manual transmissions. You will learn how to carry out diagnostics yourself without a scanner, which errors are critical for the engine, and which can be temporarily ignored. We will pay special attention to common problems with sensors, the ignition system and the gearbox - they are the ones that most often become the cause of sudden breakdowns.

How to read error codes on a Nissan Sunny without a scanner

If you do not have diagnostic equipment, you can obtain fault codes manually - via self-diagnosis mode. This method works on most models Sunny 1990–2000s (B13, B14, N14, N15). The instructions are universal for gasoline versions with a fuel injection system.

Algorithm of actions:

• 🔧 Turn off the ignition and make sure all electrical appliances are turned off.
• 🔑 Insert the key into the ignition, but do not turn it.
• 📍 Find the diagnostic connector under the hood (usually next to the battery or on the engine compartment partition). On Sunny B13/B14 This is a 12-pin connector, on N14/N15 — 16-pin (OBD-II).
• 🔌 Close your contacts 1 (GND) And 8 (TE1) for B13/B14 or 4 (GND) And 13 (TC) for OBD-II using a paper clip or wire.
• 🔄 Turn the key to position ON (without starting the engine) - the lamp on the instrument panel will start flashing Check Engine.
• 📊 Read the codes by the number of long and short flashes (for example, 3 long + 4 short = error P0304).

Find the diagnostic connector (there is a photo of the circuit in the manual)

Prepare a paperclip or wire to close the contacts

Have a notepad on hand to write down codes

Make sure the battery is charged (voltage is not lower than 12.4V)

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On models with OBD-II (after 1996) you can use a simpler method: turn on the ignition, press the gas pedal all the way and hold it for 5 seconds, then release. After this the lamp Check Engine will begin to issue codes in flashing format. Important: this method does not work on all versions Sunny, therefore, the priority remains the closure of contacts in the connector.

⚠️ Attention: If after self-diagnosis the lamp Check Engine flashes continuously at regular intervals (for example, 0.5 seconds), this means there are no errors in the ECU memory. Do not confuse this signal with real codes!

Decoding engine error codes (P0XXX)

Series errors P0XXX relate to the engine control system and are the most common on Nissan Sunny. Below is a table with the most common codes, their meanings and typical causes.

Error code	Description	Possible reasons	Criticality level
P0100	Mass Air Flow (MAF) Sensor Circuit Malfunction	Sensor contamination, broken wiring, connector corrosion, ECU malfunction	Average
P0300	Multiple misfires	Worn spark plugs/wires, faulty coils, low fuel pressure, air leaks	High
P0325	Problems with the knock sensor	Damage to the sensor, poor contact, mechanical damage to the cylinder block	Low
P0420	Low catalytic converter efficiency	Catalyst wear, exhaust leak, rich/lean fuel mixture	Average
P0505	Idle Air Control System (IACV) malfunction	Valve contamination, actuator failure, incorrect signals from the throttle position sensor	High

Errors P030X (where X is the cylinder number, for example, P0302) indicate misfire in a specific cylinder. On Sunny with engines GA16DE And SR20DE this is often due to wear and tear ignition coils or breakdown of high-voltage wires. Also check the compression in the cylinders - low values ​​(less than 10 bar) may indicate burnt valves or worn piston rings.

The error deserves special attention P0420 - it signals problems with the catalyst. In practice this could mean:

• 🔥 Clogged catalytic converter (requires replacement or removal with Euro-2 firmware).
• 🛢️ Faulty lambda probes (front or rear).
• 💨 Air leaks in the exhaust system (for example, through cracks in the manifold).

GA14DE (1.4L)

GA16DE (1.6L)

SR20DE (2.0L)

Other

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Transmission errors (P07XX, P08XX) and automatic transmission

Automatic transmissions on Nissan Sunny (especially 4-speed RE4F03A And RE4R01A) are known for their reliability, but they can also produce errors. Series codes P07XX And P08XX relate to the transmission and require special attention, since ignoring problems can lead to expensive automatic transmission repairs.

Typical errors and their meanings:

• 🔄 P0730 — incorrect transmission ratio (often caused by wear of clutches or solenoids).
• 🛑 P0740 — malfunction of the torque converter locking (may appear jerkily during acceleration).
• 🔥 P0750 — problem with the gear shift solenoid (requires checking the wiring and replacing the solenoid).
• 📉 P0841 — low oil pressure in the automatic transmission (critical! It is urgent to check the level and condition of the ATF).

If the icon on the instrument panel lights up «AT» (automatic transmission malfunction), first check:

1. Level and condition of the transmission fluid (should be red, without a burning smell).
2. Integrity of the wiring to the solenoids (wires near the box often fray).
3. The presence of metal shavings on the pan magnet (indicates wear of the clutches).

⚠️ Attention: If after changing the oil in the automatic transmission there is an error P0740 or P0750 does not disappear, do not try to “reset” it by repeatedly disconnecting the battery. This can lead to a loss of adaptive settings of the box and a deterioration in the smoothness of switching. Contact a diagnostician to check the solenoids!

ABS and brake system errors (C1XXX)

Fault codes starting with C1XXX, relate to the system ABS and brakes. On Nissan Sunny they are often associated with wheel speed sensors or the ABS control unit. This is especially true for models N15 And B14, where electronics are more sensitive to moisture and corrosion.

Common ABS errors:

• 🚗 C1130 — malfunction of the right front wheel speed sensor.
• 🔄 C1145 — open or short circuit in the left rear wheel sensor circuit.
• ⚡ C1201 - low voltage in the ABS network (check the generator and battery).
• 🛠️ C1205 — ABS pump malfunction (requires unit replacement).

Before replacing ABS sensors, be sure to:

1. Clean them from dirt (use lint-free cloth and alcohol).
2. Check the gap between the sensor and the gear rotor (should be 0.5–1.5 mm).
3. Inspect the wiring for chafing (especially around the hubs).

How to check the ABS sensor with a multimeter?

Jack up the wheel and remove the sensor.

Connect a multimeter in ohmmeter mode to the sensor contacts.

The resistance of a working sensor should be within the range 800–1400 Ohm.

Spin the wheel manually - the resistance should change (this indicates the generation of a signal).

If after cleaning the sensors and checking the wiring the ABS error remains, the problem may lie in control unit. On Sunny N15 it is located under the hood near the master cylinder and often suffers from moisture ingress. In this case, the unit requires repair or replacement.

Electronics and on-board network errors (BXXXX, UXXXX)

Codes BXXXX And UXXXX refer to malfunctions of body electronics, immobilizer, comfort system and CAN bus. On Nissan Sunny They are less common than engine errors, but can cause serious inconvenience. For example, error B1318 (immobilizer key malfunction) may prevent the engine from starting.

Typical problems:

• 🔑 B1318 — the key is not recognized by the immobilizer (check the chip in the key and the antenna around the ignition switch).
• 🔋 B1400 — low voltage of the on-board network (often due to a discharged battery or faulty generator).
• 📡 U1000 — lack of communication with the computer (check the fuses and grounding of the unit).
• 🚪 B1205 — a malfunction of the door driver (may manifest itself as non-working power windows).

Series errors UXXXX often associated with CAN bus - a network that unites all electronic units of the car. On Sunny N16 and later models this may manifest itself as:

• Speedometer or tachometer failure.
• Spontaneous turning on/off of headlights.
• Inoperative instrument panel.

To diagnose the CAN bus, you will need a scanner that supports the protocol Nissan Consult. You can check it yourself:

1. Wire integrity CAN-H And CAN-L (usually twisted into a bundle near the ECU).
2. Voltage at OBD-II connector contacts: between CAN-H And CAN-L should be ~60 ohms.
3. The quality of the “mass” on the body (especially after an accident or body repair).

How to reset errors on Nissan Sunny

After eliminating the malfunction, the error must be reset, otherwise it will be displayed in the ECU memory even after repair. There are several ways to do this:

Method 1: Via diagnostic connector (for OBD-I)

1. Close the contacts 1 And 8 in the connector (as when reading codes).
2. Turn the key to position ON.
3. Wait 2-3 seconds, then turn off the short circuit.
4. Turn off the ignition - the errors will be reset.

Method 2: Disconnecting the battery

Disconnect the negative terminal of the battery for 10-15 minutes. This will reset all ECU adaptations (including throttle learning), so after connection, unstable engine operation may be observed for 5-10 km.

Method 3: Through a scanner

If you have a diagnostic scanner (for example, ELM327 or Launch CReader), connect it to the OBD-II connector and select the “Erase errors” function. This is the most reliable method, as it allows you to preserve the ECU adaptations.

⚠️ Attention: On models Sunny with immobilizer (NAT) disconnecting the battery may result in loss of communication between the key and the ECU. In this case, you will need to retrain the keys using a scanner or in a service.

Frequently asked questions about Nissan Sunny error codes

Is it possible to drive with P0300 (misfire)?

Short term - yes, but not recommended. Prolonged driving with misfires can lead to:

• Damage to the catalyst (due to unburned fuel entering it).
• Overheating of cylinders and burnout of pistons.
• Increased fuel consumption (up to 20–30%).

If the error appears for the first time, check the spark plugs and wires. If the problem persists, diagnose the ignition coils and compression.

How to distinguish an oxygen sensor error (P0130) from a catalytic converter problem (P0420)?

Error P0130 indicates a malfunction first (front) lambda probe, and P0420 - low catalyst efficiency. To differentiate them:

1. Check the voltage on the sensor signal wire (should fluctuate between 0.1 and 0.9 V when running at idle).
2. Inspect the exhaust gases for the smell of sulfur (if the catalyst is faulty, it becomes stronger).
3. Replace the sensor with a known good one - if the error remains, the problem is in the catalyst.

Why does P0505 (idle air control) appear again after resetting?

This is a typical problem for Nissan Sunny with engines GA16DE. Reasons:

• The idle air valve is dirty (requires cleaning with carb cleaner).
• Air leaks through cracks in the pipes or the intake manifold gasket.
• Malfunction of the throttle position sensor (check the voltage at the middle contact - it should be 0.4–0.6 V at idle).

If the idle air valve (IACV) is clean, but the error returns, replace it with a new one (part number for GA16DE: 22680-4M000).

Is it possible to flash the ECU to clear the P0420 (catalytic converter) code?

Yes, but this is a half measure. Firmware for Euro 2 (without a catalyst) will remove the error, but:

• Fuel consumption will increase by 5–10%.
• The exhaust will become more toxic (you will not pass the eco-test).
• There may be problems with the operation of the lambda probes.

It is better to replace the catalyst with a new one or install flame arrester with a lambda probe decoy.

Where can I find electrical diagrams for Nissan Sunny N15?

Official diagrams can be found in the manuals Nissan (article for Sunny N15: EWM920U0E00). Alternative sources:

• Forums Nissan Club Russia or Sunny Club (there are scans posted).
• Program Mitchell1 or AllData (paid, but with detailed diagrams).
• VKontakte groups dedicated to Nissan Sunny (for example, "Nissan Sunny B14/N14/N15").

For wiring diagnostics it is useful to have multimeter with calling and dialing function repair connectors to check contacts.