Nissan AD is a legendary sedan that has earned the love of car owners for its reliability and maintainability. However, even such machines have weak points, and one of them is ignition coil. This part is responsible for generating the high voltage necessary to ignite the air-fuel mixture. When it fails, the engine begins to βtripleβ, loses power, and fuel consumption increases by leaps and bounds.
In this article we will look at how independently diagnose a faulty ignition coil on Nissan AD (including modifications with engines GA16DE, SR20DE And QR25DE), what tools will be needed to check, how to choose a high-quality analogue of the original part and install it correctly. We will pay special attention to typical replacement errors that can lead to damage to the electronic components of the car.
Signs of a faulty ignition coil Nissan AD
Symptoms of a broken ignition coil are often confused with problems with spark plugs, high-voltage wires, or even the fuel system. However, there are a number characteristic features, which directly point to it:
- π₯ Misfires (βtripletingβ of the engine), especially when cold or under high loads. More often it appears on the 2nd and 3rd cylinders due to the peculiarities of the engine layout.
- β‘ Jerks during acceleration β the car twitches as if it is being βheldβ from behind. This is due to an unstable spark in one or more cylinders.
- π’οΈ Increased fuel consumption (by 15β25%) due to incomplete combustion of the mixture. The ECU tries to compensate for the misfires by enriching the air-fuel mixture.
- π¨ Check Engine with errors
P0300βP0306(misfire) orP0351βP0356(coil circuit malfunction).
On Nissan AD with engine SR20DE a faulty coil often appears problems with starting βhotβ - the starter turns, but the engine does not catch until it cools down. This is due to thermal expansion of the windings and current leakage.
β οΈ Attention: If misfires are accompanied by popping noises in the exhaust system, this may indicate a breakdown of the coil insulation. In this case, further operation may result in damage to the catalyst!
How to check an ignition coil with a multimeter: step-by-step instructions
Diagnostics of the ignition coil Nissan AD does not require complex equipment - a digital multimeter with a resistance measurement function is sufficient. Before checking it is necessary disconnect the negative terminal of the battery and remove the coil from the well.
On most modifications AD coils are used three conclusions:
- +B (12V power supply from the ECU),
- GND (mass),
- IGT (control signal from the ECU).
| Parameter | Normal value | Reason for rejection |
|---|---|---|
Primary winding resistance (between +B And GND) |
0.5β1.5 Ohm | Open circuit or interturn short circuit |
Secondary winding resistance (between +B and high voltage output) |
6β15 kOhm | Insulation breakdown or break |
Resistance between IGT and mass |
More than 10 MOhm | Current leakage in the control circuit |
If the resistance of the primary winding is close to zero, this is turn-to-turn short circuit, if infinity - break. In the secondary winding, both underestimated and overestimated resistance are critical: the first indicates a breakdown, the second indicates an internal break.
Disconnect the negative terminal of the battery|Remove the coil from the well|Measure the resistance of the primary winding|Check the secondary winding|Make sure there are no leaks to the housing-->
β οΈ Attention: On engines QR25DE the coils are integrated into the spark plug wells. When checking, do not pull on the high-voltage wire - this may damage the contact!
Original vs analogues: which ignition coils are suitable for Nissan AD
Original ignition coils for Nissan AD are produced under the brand Hitachi (article 22448-4M000 for GA16DE/SR20DE) and cost from 4,500 to 7,000 rubles. However, there are worthy analogues on the market that are not inferior in reliability, but are 30β50% cheaper:
- π§ Denso (
550-0103) - Japanese quality, resource 150+ thousand km. Suitable for all modifications AD. - π§ NGK (
U5008) - optimized for working with iridium spark plugs, recommended for tuned engines. - π§ Bosch (
0 221 504 474) - German reliability, but sensitive to overheating (not suitable for extreme conditions). - π§ Beru (
ZS202) - a budget option (from 2,200 rubles), but the resource is 20β30% lower than the original.
When choosing an analogue, pay attention to ECU compatibility. For example, coils Denso for SR20DE may conflict with firmware ECU from Nissan Stagea, even if they physically fit the connector.
Original (Hitachi)|Denso|NGK|Bosch|Beru|Other brand-->
On engines QR25DE (after 2002) individual coils are used for each cylinder (article number 22448-AL50A). They cannot be replaced with universal ones from GA16DE - this will lead to errors P0351βP0354 and misfires!
Step-by-step replacement of the ignition coil with Nissan AD: nuances for different engines
The process of replacing the coil Nissan AD takes 30β60 minutes and does not require special skills. However there is key differences depending on engine type:
Engines GA16DE And SR20DE (until 2000)
Here it is used one coil for two cylinders (system wasted spark). Procedure:
- Remove the decorative engine cover (4 plastic clips).
- Disconnect the power connector from the coil (press the lock on top).
- Unscrew the two mounting bolts (10 mm wrench).
- Carefully remove the coil by rocking it from side to side (do not pull on the wires!).
Engines QR25DE (after 2000)
On these engines custom coils for each cylinder. Replacement is more difficult due to close proximity:
- Remove the intake manifold (8 x 12mm bolts) or work through the mirror.
- Disconnect the connector by pressing the latch on the side (do not break it!).
- Unscrew the fastening bolt (8 mm wrench) and remove the coil along with the spark plug.
- Before installing a new coil be sure to check the spark plug gap (should be 1.1 mm).
Before installing the new coil, apply a thin layer of dielectric grease to the rubber tip to prevent sticking and make future replacement easier.
β οΈ Attention: OnQR25DEafter replacing the coil it may light upCheck Enginewith an errorP0300. This is normal - the error will reset after 2-3 engine starting cycles. If not, check the connector connection!
Typical mistakes when replacing an ignition coil and how to avoid them
Even experienced car owners make mistakes that lead to repeated breakdowns or damage to the ECU. Here are the most common:
- β‘ Using incompatible coils. For example, installing a coil from Nissan Primera P12 on AD with
SR20DEwill lead to skips due to different resistance of the windings. - π§ Tightening the mounting bolts. The maximum torque is 10 Nm. Exceeding this leads to deformation of the coil body.
- π οΈ Ignoring the state of the candles. Worn spark plugs (gap more than 1.3 mm) accelerate coil failure.
- π Damage to the power connector. On
QR25DEThe connector latches are fragile and can be easily broken if disconnected carelessly.
Another critical error - replacing only one coil upon breakdown. If the service life of a part has come to an end, the rest are also on the verge of failure. It is optimal to change it as a set, especially on engines with mileage over 200 thousand km.
What happens if you drive with a faulty coil?
Long-term operation with misfires leads to:
- Overheating of the catalyst (risk of melting).
- Increased wear of the piston group due to detonation.
- Damage to the ECU from reverse voltage pulses.
- Increased oil consumption (due to fuel entering the crankcase).
How to extend the life of an ignition coil Nissan AD
The average life of an ignition coil is 100β150 thousand km, but with proper operation this life can be increased by 1.5β2 times. Here practical recommendations:
- π₯ Monitor the condition of the candles. Change them every 30-40 thousand km (for iridium - 80-100 thousand km). Worn spark plugs create increased load on the coil.
- π’οΈ Avoid flooding the engine during a cold start. An overly rich mixture will cause the coil to overheat.
- π Check high voltage wires for breakdown (resistance should be 5β10 kOhm). Wire breakdown = coil overload.
- π Don't ignore mistakes
P0300βP0306. Even single misfires reduce the life of the coil.
On Nissan AD with SR20DE pay special attention condition of valve stem seals. Oil getting into the spark plug wells leads to current leakage through the rubber tip of the coil.
Regular diagnostics of coils with a multimeter (every 50 thousand km) allows you to identify incipient degradation of the windings BEFORE symptoms appear.
Where to buy an ignition coil for Nissan AD: verified suppliers
When buying an ignition coil, the risk of running into a fake is extremely high. Here proven options with a guarantee of originality:
| Supplier | Pros | Cons | Average price (RUB) |
|---|---|---|---|
| Official Nissan dealers | 100% original, 1 year warranty | Long wait (2β4 weeks), high price | 6 000β7 500 |
| EXIST | Fast delivery, wide range of analogues | Risk of branded counterfeits Denso | 2 500β5 000 |
| JP Car Parts | Direct deliveries from Japan, original Hitachi | Expensive delivery, difficulties with returns | 4 500β6 000 |
| Local disassemblies (for example, Drom) | Low price (from RUB 1,500) | No guarantee, high risk of early failure | 1 500β3 000 |
When purchasing, pay attention to markings on the body. Original coils Hitachi have laser engraving of the article number and production date. On fakes, the markings are often applied with paint or a sticker.
FAQ: Frequently asked questions about ignition coils Nissan AD
Is it possible to drive with one faulty coil?
Technically possible, but highly undesirable. Long-term operation with misfires leads to:
- Overheating of the catalyst (risk of its destruction).
- Increased wear of the piston group due to detonation.
- Overloading the remaining coils (they will fail faster).
On Nissan AD with QR25DE Driving with a faulty coil for more than 500 km often leads to an error P0420 (low catalyst efficiency).
How to distinguish a coil malfunction from problems with spark plugs?
The simplest way is swap places a suspicious coil and a spark plug from a known good cylinder:
- If the passes βmovedβ along with the coil, it is her fault.
- If they remain on the same cylinder, the problem is in the spark plug or wire.
Also note nature of omissions:
- Coil: skips are constant, increasing with load.
- Spark plug: misfires appear after warming up or at high speeds.
Do I need to remove the battery when replacing the coil?
Definitely! Disabling the negative terminal of the battery is necessary for:
- Elimination of short circuit when disconnecting the coil connector.
- Resetting errors in the ECU (if they were caused by a faulty coil).
- Safety - when the ignition is running, there is a voltage of up to 400V at the coil connector!
On Nissan AD with an immobilizer after disconnecting the battery may be required retraining keys (the procedure is described in the manual).
What resistance should the coil have on a Nissan AD with an SR20DE engine?
For SR20DE (coil Hitachi 22448-4M000) normal values:
- Primary winding: 0.7β1.2 Ohm.
- Secondary winding: 8β12 kOhm.
If the resistance of the secondary winding is below 6 kOhm, the coil is broken and must be replaced. If above 15 kOhm - internal break.
Can the ignition coil be repaired or is it just a replacement?
Ignition coil repair impractical for several reasons:
- Modern reels have sealed housing, which cannot be disassembled without damage.
- The windings are impregnated with an epoxy compound - it is impossible to restore them in a garage.
- Even if it is possible to rewind the winding, the service life of the repaired coil will not exceed 10β20 thousand km.
Exception - replacement rubber tip (article 22449-4M000), if it has lost elasticity. But this is only relevant for coils GA16DE/SR20DE.