Nissan Primera P12 - a reliable car, but even it has problems with the ignition system. If the engine suddenly stops starting, idles or stalls, and diagnostics show no spark, this is a signal of a serious malfunction. Unlike modern cars with complex electronics, P12 can still be diagnosed independently, but to do this you need to know where to look for the problem.

The lack of a spark can be caused by a dozen reasons: from banal wear of spark plugs to failure ignition module or ECU. In this article, we'll walk you through every possible scenario, from simple to complex, and provide step-by-step instructions for checking each element. We will pay special attention typical "diseases" of P12 engines QR20DE And QR25DEwhere the problem often lies in the crankshaft position sensor or wiring.

1. First steps: how to confirm the absence of a spark

Before you disassemble half of the car, make sure that the problem is the lack of a spark. Symptoms may coincide with other faults (for example, the fuel system), so the diagnosis must be accurate.

The easiest way to check is spark test:

  1. Unscrew one spark plug (it is better to use one that is known to be working).
  2. Insert it into the high-voltage wire and press the metal part tightly against the engine ground (for example, against the valve cover).
  3. Have a helper crank the starter for 2-3 seconds.

If there is no spark, the problem is confirmed. If there is a spark, but weak (dull, intermittent), this is also a diagnostic sign.

⚠️ Attention: Do not hold the candle with your hands during the test! Use dielectric gloves or pliers with insulated handles. The voltage in the ignition system can reach 40,000 V.

If there is no spark at any spark plug, the problem lies in the general elements of the system (ignition module, ECU, sensors). If there is no spark on only 1-2 cylinders, individual components (wires, coils, spark plugs) are to blame.

📊 What engine does your Nissan Primera P12 have?
  • QR20DE (2.0 l)
  • QR25DE (2.5 l)
  • Other petrol
  • Diesel

2. Top 5 reasons for lack of spark on Primera P12

Based on repair statistics and owner reviews, we have compiled a rating of the most common causes of spark loss on this model. Some of them can be eliminated in 10 minutes, others will require serious intervention.

  • 🔥 Faulty spark plugs - even if they are “fresh,” they could fail due to low-quality fuel or oil deposits.
  • ⚡ Breakdown of high-voltage wires - a common problem on cars older than 10 years, especially if the wires have never been changed.
  • 📊 Failure of the ignition module — on P12 it often “dies” after 150-200 thousand km.
  • 🔄 Malfunction of the crankshaft position sensor (CPS) — without its signal, the ECU does not give the command to spark.
  • 🖥️ Problems with the ECU - rarely, but it happens, especially after “makeshift” chip tuning or power surges.

Interesting fact: on Primera P12 with engine QR25DE The ignition module often fails, and QR20DE — problems with the wiring of the crankshaft sensor. This is due to the different layout of the engine compartment.

Reason Symptoms Difficulty of repair Cost of elimination (RUB)
Spark plugs No spark on all or some cylinders ⭐ 500–2000
High voltage wires Misfire, weak or no spark on several cylinders ⭐⭐ 1500–4000
Ignition module No spark on all cylinders, engine does not start ⭐⭐⭐ 5000–12000
Crankshaft sensor There is no spark and no fuel injection, the starter spins "idling" ⭐⭐ 1000–3000
ECU No spark, errors in several systems, possible problems with other sensors ⭐⭐⭐⭐ 8000–25000

3. Diagnostics of spark plugs and high-voltage wires

Start with the simplest thing - checking the spark plugs. Even if they were recently replaced, they could be “killed” by poor quality fuel, oil in the combustion chamber, or incorrect clearance.

How to check spark plugs:

  1. Remove all spark plugs (use spark plug wrench on 16 mm for Primera P12).
  2. Inspect the electrodes: normal color is gray-brown. Black carbon deposits indicate a rich mixture, white carbon deposits indicate a poor mixture, and oil on the threads indicates problems with rings or caps.
  3. Check the gap between the electrodes (should be 0.8–1.1 mm for QR20DE/QR25DE).
  4. Test the spark on each spark plug (using the method described above).

If the spark plugs are OK, move on to the high-voltage wires. Their resistance should be within 5–10 kOhm (depends on the length of the wire). Checked with a multimeter in resistance measurement mode:

Remove the wires from the coils and spark plugs

Measure the resistance of each wire (from 5 to 10 kOhm)

Inspect for cracks or breaks in insulation

Check the tightness of the connectors -->

Please note: on Primera P12 Often there are fake wires with low resistance. This leads to a weak spark and misfire. Buy only the original (Nissan 22441-4M010) or proven analogues (NGK, Denso).

⚠️ Attention: Never pull the wires - only the lugs! Damage to the internal core will result in current leakage and misfire.

4. Ignition module: how to check and replace

Ignition module (aka ignition coil) on Primera P12 - one of the most vulnerable places. It is located on the valve cover and consists of two or four coils (depending on the engine). When it fails, the spark disappears on all cylinders at once.

Signs of module malfunction:

  • 🚗 The engine does not start, the starter turns.
  • 🔥 There is no spark on all candles.
  • 💥 Lights up on the dashboard CHECK ENGINE (error code often P0351–P0354).
  • 🔌 When checking with a multimeter, the resistance of the windings goes beyond the limits 0.5–2.0 Ohm (primary) and 8–15 kOhm (secondary).

How to check the ignition module:

  1. Remove the module (disconnect the connector and unscrew the 4 bolts).
  2. Ring the primary windings (contacts 1–4 And 2–3 on the connector) - the resistance should be the same on both coils.
  3. Ring the secondary windings (leads to spark plug wires) - the resistance should be within 8–15 kOhm.
  4. Check for a short circuit to the case (the resistance should approach infinity).

If the module is faulty, it must be replaced. Original article for QR20DE/QR25DE — Nissan 22448-4M000. The cost of a new module is from 8 to 15 thousand rubles. It is not recommended to buy a used one: the life of the coils is limited, and the “donor” module may soon fail.

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Before installing a new ignition module, clean the connector contacts from oxidation and apply dielectric grease. This will prevent corrosion and improve contact.

5. Crankshaft position sensor (CPS) - the hidden culprit

DPKV is the only sensor without a signal from the ECU completely blocks spark and fuel injection. If the engine turns over with the starter, but doesn’t even “start”, the first check is this sensor.

On Primera P12 The DPKV is located on the oil pump cover (on the gearbox side). It is easily identified by two mounting bolts and a connector with three wires.

How to check DPKV:

  1. Remove the sensor (unscrew the two bolts on 10 mm).
  2. Inspect it for metal shavings or damage.
  3. Test the winding with a multimeter: the resistance should be 550–750 Ohm.
  4. Check the gap between the sensor and the drive disc (should be 0.5–1.5 mm).

If the sensor is faulty, replace it with a new one (part number Nissan 23731-4M000). Cost - about 1500–2500 rubles. After replacement be sure to reset the ECU errors, otherwise the engine may not start.

⚠️ Attention: When installing DPKV, do not use sealant on the bolt threads! It can get on the working surface of the sensor and damage it.
What happens if you drive with a faulty DPKV?

The sensor may work “every once in a while”, causing misfires and jerking when driving. In some cases, this leads to detonation, which destroys the pistons and rings. On Primera P12 with engine QR25DE There are cases where long-term driving with a faulty DPKV led to damage to the catalyst due to incomplete combustion of fuel.

6. Problems with the ECU and wiring: when everything is checked, but there is no spark

If you have reached this section, it means that the spark plugs, wires, ignition module and DPKV are in order, but there is still no spark. In this case, the problem may lie in:

  • 🔌 Broken or shorted wiring (especially between the ECU and the ignition module).
  • 🖥️ Malfunctions of the ECU itself (transistors burned out, tracks oxidized).
  • 🔋 ECU power supply problems (the fuse has blown, the contacts have oxidized).
  • 📶 Poor grounding (weight of the ECU or ignition module).

How to diagnose:

  1. Check fuses IGN (number 30 in the block under the hood) and ECU (number 10 in the cabin block).
  2. Inspect the ECU connectors (located under the glove compartment) for oxidation or moisture.
  3. Ring the ignition module power circuit: on contact 1 there should be a connector +12 V with the ignition on.
  4. Check the ECU ground (black wire on contact 20 connector) - the resistance to the body should be 0 ohm.

If the ECU is faulty, you can try to repair it (resolder the transistors, clean the tracks) or replace it. Original block for Primera P12 — Nissan 28490-4M000, but often install analogues from Hitachi or Bosch. The cost of a new ECU is from 20 thousand rubles, a used one – from 8 thousand.

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Before replacing the ECU, be sure to check the power and ground circuits! In 30% of cases, the problem lies not in the unit itself, but in the wiring or poor contact.

7. Additional reasons: what else can kill the spark?

Sometimes the spark disappears due to unobvious reasons that are not directly related to the ignition system. Here's what else is worth checking:

  • 🔋 Low or faulty battery - if the voltage is lower 11.5 V, The ECU may be blocking the spark.
  • 🔌 Faulty ignition switch - if the signal does not arrive IGN on the computer, the ignition system is not activated.
  • 🛢️ Problems with the fuel system - if the fuel pressure is too low, the ECU can turn off the ignition (knock protection).
  • 🌡️ Temperature sensor malfunction — if there is a false signal about overheating, the ECU turns off the ignition.

Pay special attention immobilizer. On Primera P12 it sometimes blocks startup due to a fault in the key chip or antenna. Try starting the car with the spare key - if it starts, the problem is in the immobilizer.

Also check main relay (in the passenger compartment fuse box, usually under number R1). If it does not click when you turn on the ignition, replace it - without it, the ECU does not receive power.

FAQ: Frequently asked questions about loss of spark on Nissan Primera P12

Is it possible to drive if there is no spark on one cylinder?

Technically possible, but highly not recommended. Lack of spark on one cylinder leads to:

  • Increased fuel consumption (up to +30%).
  • Vibrations and imbalances that destroy engine mounts.
  • Unburned fuel may enter the catalyst, causing it to fail.

If you need to get to a service station, do it at minimum speed and without load.

What is the service life of the ignition module on Primera P12?

Average resource of the original module - 150–200 thousand km. However, it greatly depends on the operating conditions:

  • Frequent short trips will shorten the service life due to condensation.
  • Poor quality spark plugs or wires increase the load on the coils.
  • Overheating (for example, due to a faulty fan) accelerates the degradation of insulation.

Signs of a “dying” module: misfires when cold, unstable idling, jerking during acceleration.

Can the ignition module be repaired or is it just a replacement?

In most cases, the module is not repairable, but there are exceptions:

  • If the problem is a housing crack, it can be sealed with epoxy resin (temporary solution).
  • If one of the coils has burned out, sometimes it is possible to replace it separately (but this requires soldering work).

However repair does not guarantee durability — it is better to install a new or proven used module.

What spark plugs are best for Primera P12?

Original candles for QR20DE/QR25DE — Nissan 22401-4M015 (manufacturer NGK, article IFR6A11). Good analogues:

  • Denso IK16 or IK20 (for gas).
  • Bosch FR7DPX.
  • Brisk LR15YC (budget option).

The gap should be 0.8–1.1 mm. Spark plugs need to be changed every 30–40 thousand km (or 20 thousand km when using gas).

What should I do if after replacing the ignition module there is still no spark?

In this case, check:

  1. Correct connection of the connector (contacts 1–4 must match the labels on the module).
  2. Availability of food +12 V on contact 1 connector
  3. Mass integrity (contact 2 on the module must have 0 ohm with body).
  4. Signal from DPKV (check with an oscilloscope or by replacing it with a known-good sensor).

If everything is in order, but there is no spark, the problem is in the ECU or the wiring between the ECU and the module.