Fault code P1277 on Nissan Bluebird Sylphy - one of those mistakes that can baffle even experienced car owners. It is related to the operation of the fuel system, but its manifestations can vary from a barely noticeable drop in power to a complete failure of the engine to start. Unlike common errors with oxygen sensors or catalyst, P1277 often ignored by mid-level diagnostic scanners, making it difficult to detect.

In this article we will not just list possible causes - we will analyze the mechanism of error occurrence at the operational level ECU (electronic control unit), we will show you how to correctly interpret data from diagnostic equipment, and we will give step by step instructions to troubleshoot. We will pay special attention to the nuances specific to Bluebird Sylphy (including models with engines HR16DE And MR20DE), where is the error P1277 often disguised as other problems.

What does error P1277 mean on Nissan Bluebird Sylphy

Code P1277 in the diagnostic system Nissan stands for "Fuel Injector Circuit Malfunction — Bank 1" (malfunction of the fuel injector circuit of the first row of cylinders). However, this definition is too general. In practice, the error indicates one of three key problems:

  • 🔌 Open or short circuit in the injector control circuit (most often in the wiring harness from ECU to the injectors).
  • 🛢️ Unstable voltage on the injectors, caused by a faulty fuel pump relay or fuse box.
  • 🤖 ECU malfunctionwhen the control unit incorrectly interprets signals from the injectors (for example, due to corrosion of the contacts or a firmware error).

It is important to understand that Bluebird Sylphy error P1277 often accompanied by additional codes such as P0300 (misfire) or P0171 (lean mixture). This is due to the fact that incorrect operation of the injectors leads to an imbalance in the air-fuel mixture. If your scanner shows only P1277 without any associated errors, there is an 85% chance that the problem lies in the injector wiring or connectors - this is a unique feature of this model.

On engines HR16DE (1.6 l) the error appears more often when cold, whereas when MR20DE (2.0 l) it can occur under high loads (for example, when overtaking). This is due to different operating logic ECU in these modifications.

📊 How often do you encounter fuel system errors?
  • Often (once a month or more)
  • Sometimes (every 3-6 months)
  • Nearby (once a year or less)
  • Never

Symptoms of error P1277: how to recognize it

Error P1277 rarely manifests itself in the same way on different cars. On Nissan Bluebird Sylphy it can be identified by the following characteristics:

  • 🚗 Engine troubles at idle, especially after warming up. The vibration may be weak but noticeable in the steering wheel or gearshift lever.
  • ⚡ Sudden power drops When accelerating, it’s as if the car is “choking.” This is due to one or more injectors not opening in time.
  • 🔥 Increased fuel consumption (by 10–15%) due to the fact that ECU compensates for the malfunction by enriching the mixture.
  • 🛑 Difficulty starting after a long stay (more than 4–5 hours). The engine can only start after 2–3 attempts.
  • 💡 Check Engine light on, but the scanner only shows P1277 without additional codes (typical for Bluebird Sylphy 2012–2017).

One of the most insidious symptoms is false misfires. For example, during diagnostics, the scanner may show misfires in the 3rd cylinder, but the real problem lies in the injector circuit of the 1st or 2nd cylinder. This is due to the fact that ECU Nissan sometimes misinterprets signals when the voltage in the circuit is unstable.

⚠️ Attention: If the error P1277 appears only in wet weather or after washing the engine, with a 90% probability the problem is in the oxidized contacts of the injector connectors or ECU. Don't rush to change injectors - check the wiring first!
Symptom Probable Cause Urgency of elimination
Engine stalls at idle Malfunction of 1–2 injectors or open circuit Moderate (can be driven, but risk of aggravation)
Dips during acceleration Short circuit in harness or unstable power High (may lead to exit ECU)
Difficulty starting when cold Low fuel rail pressure or clogged injectors Low (but may develop into complete failure)
Check Engine Lights Constantly System error ECU or damaged wiring Critical (requires immediate diagnosis)

Causes of error P1277

On Nissan Bluebird Sylphy error P1277 can be caused by both mechanical faults and electronic problems. Let's consider the main reasons in descending order of their likelihood:

  1. Damage to injector wiring or connectors. On models 2010–2015, the harness near the manifold often frays due to vibrations. The contacts in the connectors also oxidize (especially if the car was operated in a humid climate).
  2. Malfunction of fuel injectors. Most often, the injectors of cylinders 1 and 4 fail due to overheating (they are located closer to the exhaust). On HR16DE the injector life is ~120–150 thousand km, at MR20DE - up to 200 thousand km.
  3. Problems with the fuel pump relay. The relay (usually located in the fuse box under the hood) may become sticky or not provide stable voltage. This causes the injectors to receive insufficient power.
  4. ECU malfunction. The injector driver in the control unit may burn out (especially if there were previously short circuits in the circuit). The error may also appear after incorrect chip tuning.
  5. Clogged fuel rail or filter. If the filter has not been changed for more than 30 thousand km, dirt particles can block the injectors, causing their unstable operation.

It is worth highlighting software glitches. On Bluebird Sylphy 2014–2018 model years there were cases when the error P1277 appeared after firmware update ECU in the official service. This is due to a bug in fuel map calibrations for some regions.

How to check the injector chain without a scanner?

1. Disconnect the connector from any injector.

2. Connect the multimeter in resistance measurement mode to the connector contacts.

3. Normal resistance of a working injector: 11–15 Ohms (for Nissan).

4. If the resistance is below 5 Ohms - a short circuit, if above 20 Ohms - an open circuit.

5. Check the voltage at the connector with the ignition on: it should be 12 V (if not, there is a problem in the wiring or ECU).

Diagnosing error P1277: step-by-step instructions

To pinpoint the cause P1277, a comprehensive diagnosis will be required. Below are instructions adapted specifically for Nissan Bluebird Sylphy:

Read all errors with a scanner (not only P1277)|Check the injector resistance with a multimeter|Inspect the wiring for chafing|Check the voltage at the fuel pump connector|Test the relays and fuses

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Step 1: Reading Errors

Use a diagnostic scanner (eg Launch CReader or ELM327) for reading everyone mistakes, not just P1277. Please note the accompanying codes:

  • P0200–P0204 — malfunction of the injector circuit of a specific cylinder.
  • P0300–P0304 — misfires (may be a consequence of P1277).
  • P0171/P0174 - lean mixture (indicates injectors not working).

If except P1277 there are no other errors, the problem is 70% likely in the wiring or ECU.

Step 2. Checking the injectors

Disconnect the connectors from all injectors and measure their resistance. Norm for Nissan Bluebird Sylphy:

  • Engine HR16DE: 12–14 ohms.
  • Engine MR20DE: 11–13 ohms.

If the resistance is outside these limits, the injector is faulty. Also check the voltage at the connectors with the ignition on - it should be 12 V (if not, the problem is in the power circuit).

Step 3. Inspect the Wiring

Carefully inspect the wiring harness from ECU to the injectors. Pay special attention to:

  • The place where the harness passes near the intake manifold (often rubs against the brackets).
  • Connectors on the injectors (oxidation or oil leakage inside the connector).
  • Wires going to the fuel pump relay (they may melt due to their close location to the outlet).
⚠️ Attention: On Bluebird Sylphy 2015–2017 model years, there were cases when the factory insulation of injector wires cracked due to high temperatures. This led to short circuits when moisture entered. If you find cracks in the insulation, the harness must be replaced completely!

Step 4: ECU Check

If the injectors and wiring are fine, the problem may lie in the control unit. You can check this in two ways:

  1. Connect a known good one ECU (for example, from disassembly). If the error disappears, your unit is faulty.
  2. Check the voltage at the terminals ECU, responsible for the injectors (the pinout diagram is in the manual). If there is no voltage at any pin, the driver has burned out.

On Bluebird Sylphy with engine MR20DE block ECU Particularly sensitive to power surges. If there were previously problems with the battery (for example, “lighting” from another car), this could damage the electronics of the unit.

How to fix error P1277: from simple to complex

Depending on the cause, solutions P1277 can range from basic cleaning of contacts to replacement ECU. Below are step-by-step solutions for each reason:

1. Cleaning contacts and checking wiring

If the error appears after washing the engine or in wet weather, start with this:

  • 🧹 Disconnect the battery and remove the connectors from the injectors.
  • 🔍 Clean the contacts with a special spray (for example, CRC Contact Cleaner).
  • 🔧 Check the integrity of the wires: if there are any abrasions, insulate them with heat shrink or replace the harness.

On Bluebird Sylphy A simple reboot often helps ECU: Remove the battery terminal for 10-15 minutes, then connect it back. If the error was caused by a temporary glitch, it will disappear.

2. Replacing faulty injectors

If diagnostics show that one or more injectors are faulty:

  • 🛒 Buy new injectors (original numbers for HR16DE: 16600-4M000, for MR20DE: 16600-4M200).
  • 🔧 Replace the injectors one at a time, checking for errors with the scanner each time.
  • 💡 After replacement, reset the fuel system adaptations (via a diagnostic scanner or by disconnecting the battery).
⚠️ Attention: On Bluebird Sylphy with engine MR20DE after replacing injectors, firmware may be required ECU for new calibrations. If you do not do this, the engine will run unstable!

3. Repair or replace ECU

If the problem is in the control unit:

  • 🔧 Try to reflash ECU original firmware (for example, via Nissan Consult).
  • 🛠️ If reflashing does not help, contact the service to repair the injector drivers (cost ~5-10 thousand rubles).
  • 💰 As a last resort, replace ECU for a new or used one (it is important to choose a unit with the same firmware version!).

On models 2016–2018, there were cases where the error P1277 fixed by firmware update ECU to the latest version. Official dealers Nissan they do it free of charge under warranty (if the car is not older than 5 years).

💡

If after replacing injectors or repairs ECU error P1277 continues to appear, check the fuel pump. On Bluebird Sylphy low rail pressure (below 3 bar) can simulate injector failure.

4. Checking relays and fuses

A faulty fuel pump relay or blown fuse may cause P1277 due to unstable power supply to the injectors. On Bluebird Sylphy The relay is located in the fuse box under the hood (labeled Fuel Pump Relay). Fuse - 15A, located nearby.

To test the relay:

  1. Remove the relay and shake it - if it rattles inside, it is faulty.
  2. Swap the relay with a known good one (for example, a fan relay).
  3. If after replacement the error disappears, buy a new relay (original number: 25230-4M000).

Prevention of error P1277 on Nissan Bluebird Sylphy

To avoid reappearance P1277, follow these guidelines:

  • 🔧 Clean the injectors regularly (every 30–40 thousand km) using special additives (for example, Liqui Moly Injection Reiniger) or ultrasonic cleaning.
  • 🔋 Monitor your battery status. Voltage surges with a weak battery can damage ECU.
  • 🚿 Avoid high-pressure engine washing. Water that gets into the injector connectors often causes P1277.
  • ⛽ Refuel at trusted gas stations. Bad fuel clogs the injectors and fuel rail.
  • 🔍 Check the wiring periodically for chafing, especially if the car is operated in high humidity conditions.

On Bluebird Sylphy With a mileage of more than 100 thousand km, it is recommended to remove the fuel rail every 2 years and check the condition of the injectors visually. Oxidation or fuel leakage on the injector body is the first sign of an imminent malfunction.

💡

If your Nissan Bluebird Sylphy equipped with gas cylinder equipment (GBO), error P1277 may appear due to incorrect operation of the injector emulator. In this case, it is necessary to reconfigure the gas equipment for a specific ECU.

Frequently asked questions about error P1277

Is it possible to drive with error code P1277?

Short term - yes, but not recommended. Driving for a long time with faulty injectors or wiring can lead to:

  • Overheating of the catalyst (due to a rich mixture).
  • Damage ECU (if the problem is a short circuit).
  • Increased engine wear (due to misfires).

If the error appears for the first time, you can go to the service center, but do not put off repairs for long.

How much does it cost to repair error code P1277?

The cost depends on the reason:

  • Cleaning contacts/replacing fuse: RUB 500–1,500.
  • Replacing one nozzle: RUB 3,000–6,000. (with work).
  • Repair ECU: 5000–15000 rub.
  • Replacing the wiring harness: RUB 8,000–20,000. (depending on the amount of work).

The most expensive option is replacement ECU (from 25 thousand rubles for a new block).

Can error P1277 appear after chip tuning?

Yes, and this is one of the most common reasons for Bluebird Sylphy. Poor quality chip tuning can:

  • Distort the calibration of fuel maps, which will lead to overloading of the injectors.
  • Disable injector drivers in ECU (if the firmware is incompatible with the hardware version of the unit).

If the error appears after tuning, return the stock firmware and check the operation of the injectors.

How to reset error P1277 without a scanner?

There are two ways:

  1. Remove the battery terminal for 10–15 minutes (this will clear all errors, but will also erase adaptations ECU, so the engine may be unstable for the first 50–100 km).
  2. On some versions Bluebird Sylphy the combination will work: turn on the ignition, press the gas pedal all the way and hold for 10 seconds, then turn off the ignition. Repeat 3 times.

However, these methods will not eliminate the cause of the error, but will only temporarily hide it.

Which injectors are better to replace: original or analogues?

For Nissan Bluebird Sylphy recommended:

  • Original injectors (16600-4M000 or 16600-4M200) - the best choice for reliability, but expensive (from 8 thousand rubles per piece).
  • Analogues from Denso (numbers 195500-4780 or 195500-4790) is a good alternative, 30–40% cheaper.
  • Used injectors - only if they were removed from a car with a mileage of no more than 50 thousand km and were tested on a stand.

Do not buy cheap analogues from unknown brands - they often fail after 10–20 thousand km.