Error P0340 on Nissan Almera: why it occurs and how to fix it without a service station

Owners Nissan Almera (especially models N16, G15 And B10) often encounter an error P0340 — "Camshaft position sensor circuit malfunction." This code indicates a problem in the engine management system, which can lead to unstable engine operation, increased fuel consumption, or even the inability to start the car. Unlike other errors, P0340 often ignored until symptoms become severe.

It is important to understand that the phase sensor (aka camshaft position sensor) is responsible for synchronizing fuel injection and ignition. If it fails or transmits incorrect signals, the ECU goes into emergency mode, using data only from the crankshaft sensor. This leads to loss of power, jerks during acceleration and other problems. In this article we will look at why this occurs. P0340, how to diagnose and fix it yourself - without extra costs for service.

What does error P0340 mean on Nissan Almera

Code P0340 stands for "No Camshaft Position Sensor Signal" — there is no signal from the camshaft position sensor. In systems Nissan Almera with engines QG15DE, QG16DE And HR16DE This sensor is located on the cylinder head (usually near the first cylinder) and reads the camshaft position via a magnetic or Hall effect.

When the ECU does not receive a signal from the sensor, it:

• 🔴 Goes into emergency mode, relying only on the crankshaft sensor (P0335).
• 🔴 Detects misfires, which leads to engine tripping.
• 🔴Can block gear shifting (on automatic transmission) until the fault is eliminated.
• 🔴 Increases fuel consumption by 10–25% due to suboptimal injection.

On Almera N16 And G15 error P0340 often accompanied P0300 (misfire) or P0341 (incorrect phase sensor signal). If the problem is ignored, it may damage the catalytic converter or spark plugs.

Causes of error P0340

On Nissan Almera code P0340 may appear for several reasons. Most often the culprits are:

1. Faulty phase sensor - the most common cause (60% of cases). Over time, the magnetic core wears out or the wiring inside the sensor becomes damaged.
2. Broken or shorted wiring - oxidation of contacts, frayed wires or damage to insulation (especially important for Almera B10 over 10 years old).
3. Problems with the sensor connector - corrosion, poor contact or mechanical damage to the chip.
4. Power supply fault - for example, a fuse has blown ECU-IG (10A) or problems with the relay.
5. Mechanical damage — chips on the camshaft gear or metal shavings hitting the sensor.
6. ECU firmware failure - rare, but occurs after unsuccessful chip tuning or software update.

On Almera G15 with engine HR16DE error P0340 sometimes occurs after replacing the timing belt if the camshaft marks were set incorrectly. It is also worth checking the condition camshaft damper — its destruction can block the sensor signal.

How to check timing marks without removing the cover?

With the engine running, shine a flashlight through the inspection window on the camshaft pulley. The mark must match the mark on the body. If not, the belt has jumped 1-2 teeth.

Symptoms of error P0340 on Nissan Almera

Error P0340 manifests itself differently depending on the model and year of manufacture. General signs:

• ⚠️ Check Engine lights up on the dashboard (sometimes flashes).
• 🚗 The engine stalls or runs unstable at idle.
• ⚡ Failures during acceleration, especially at speeds of 2000–3000 rpm.
• 🛢️ Increased fuel consumption (up to +3–5 liters per 100 km).
• 🔧 Difficulty starting the engine (especially when cold).
• 🔄 The automatic transmission shifts jerkily or blocks upshifts.

On Almera N16 with engine QG15DE error P0340 often accompanied misfires in cylinders 1 and 4, since the ECU cannot accurately determine the valve timing. On G15 And B10 may be observed detonation when you press the gas hard.

⚠️ Attention: If the error P0340 appears along with P0335 (crankshaft sensor), the vehicle must not be driven as this may cause the timing marks to collide and cause serious engine damage.

How to diagnose the P0340 code yourself

For diagnosis you will need:

• 🔧 Multimeter (with diode test mode).
• 🔌 Scanning adapter (ELM327 or similar).
• 🔍 Flashlight and mirror to inspect the sensor.
• 🛠️ Screwdriver and pliers.

Step 1: Read errors with the scanner

Connect the adapter to the connector OBD-II (located under the steering wheel) and check for additional codes. If except P0340 There is P0341 or P0342, the problem is definitely in the sensor or its circuit. If there is P0300–P0304, check the spark plugs and ignition coils.

Step 2. Check the phase sensor with a multimeter

Disconnect the sensor connector and measure the resistance between the contacts:

Contacts	Normal value	Reason for rejection
1 and 2 (power)	10–14 V (with ignition on)	Open circuit or ECU malfunction
2 and 3 (signal)	0.5–1.5 kOhm	Open or short circuit in the sensor
1 and 3 (mass)	0 Ohm (continuity)	Poor ground contact

Step 3: Inspect the Connector and Wiring

Check the sensor chip for the presence of:

• 🔹 Oxidation or corrosion of contacts (clean with alcohol).
• 🔹 Damaged or frayed wires (especially near the exhaust manifold).
• 🔹 Poor fixation of the connector (should click when connected).

Disconnect the sensor connector|Test the circuit with a multimeter|Inspect the wiring for damage|Check the supply voltage (12V)|Make sure there are no metal shavings on the sensor-->

How to fix error P0340: step-by-step instructions

If diagnostics have confirmed a malfunction of the sensor or its circuit, follow this algorithm:

1. Replacing the camshaft position sensor

On Nissan Almera N16/G15 The sensor is secured with one 10 mm bolt. Procedure:

1. Disconnect the negative terminal of the battery.
2. Disconnect the sensor connector (press the lock).
3. Unscrew the mounting bolt and remove the sensor.
4. Clean the seat from dirt and metal shavings.
5. Install a new sensor (part number for QG15DE/QG16DE: 23731-4M000 or 23731-4M010).
6. Connect the connector and check the operation of the engine.

2. Wiring repair

If the problem is in the wires:

• 🔧 Clean and tin the damaged areas.
• 🔧 Replace frayed wires (use heat shrink tube).
• 🔧 Check the integrity of the shielding braid (if any).

3. Checking timing marks

If the error appears after replacing the timing belt:

1. Remove the upper timing case cover.
2. Check the alignment of the marks on the camshaft and crankshaft.
3. If there is a discrepancy, reinstall the belt according to the marks.

⚠️ Attention: On Almera HR16DE after replacing the phase sensor, it may be necessary to reset the ECU adaptations via a diagnostic scanner (for example, Launch X431 or Delphi). Without this, the error may remain in memory.

How much does repair cost and is it possible to drive with error P0340

Remediation cost P0340 depends on the reason:

Type of repair	Cost (RUB)	Time (hours)
Replacing the phase sensor	800–2500 (part) + 500–1000 (work)	0.5–1
Wiring repair	300–1500 (materials) + 1000–2000 (labor)	1–2
Diagnostics at a service station	1000–2500	0.5–1
Replacing the timing belt (if the marks are knocked down)	3000–8000 (set) + 3000–5000 (work)	3–5

Drive with a mistake P0340 possible, but not recommended:

• ✅ Short term (1–2 days) - if there are no other symptoms (triples, failures).
• ❌ Long term - leads to:
• 🔥 Overheating of the catalyst (due to a rich mixture).
• 💥 Damage to spark plugs.
• 🛑 Risk of collision of timing marks (if the problem is in the belt).

On Almera B10 with mileage over 200 thousand km ignored P0340 may lead to broken timing belt and valve bending (engine GA16DE does not bend the valve, but there is a risk).

Frequently asked questions about error P0340 on Nissan Almera

Can P0340 be reset without repair?

Yes, you can erase the code with a scanner or by disconnecting the battery for 10 minutes. However, the error will return if the cause is not eliminated. On Almera G15 after resetting, the ECU may temporarily operate in normal mode, but after 10–50 km the error will appear again.

Which phase sensor is better to buy: original or analogue?

For Nissan Almera recommended:

• 🔹 Original: 23731-4M000 (Japan) or 23731-4M010 (for HR16DE).
• 🔹 Analogues: Bosch (0 261 210 115), ERA (550449), Blue Print (ADG02403).

Avoid cheap Chinese sensors without a brand - they often fail after 1-2 months.

Why does P0340 only appear when the engine is hot?

This is typical for thermal sensor fault. When heated, the internal tracks expand and the signal disappears. Also check:

• 🔹 Quality of contact in the connector (oxidation increases when heated).
• 🔹 Condition of the shielding braid of the wiring (may shorten to ground).

Could P0340 be caused by bad gasoline?

No, P0340 not related to fuel. However, low-quality gasoline can cause Misfire (P0300), which indirectly mask the symptoms of a faulty phase sensor. If, after refueling, a flicker appears and the Check Engine, check the spark plugs and coils first.

Is it necessary to do adaptation after replacing the sensor?

On most Nissan Almera no adaptation is required - the ECU learns itself after 2-3 startup cycles. However, on G15 with HR16DE (2013+ years) it may be necessary to reset errors through the scanner, since the ECU blocks injection adjustments until the sensor’s serviceability is confirmed.