Throttle valve Nissan Murano Z50 (2003–2007) with engines VQ35DE (3.5 l) and VQ25DE (2.5 l) requires periodic adaptation - a procedure that many owners confuse with cleaning or repair. Actually damper training - this is a reset of electronic parameters in the control unit so that the engine runs smoothly without jerking, freezing speed or errors P0505 (idling system malfunction).

The procedure takes no more than 10 minutes, but 90% of problems arise due to an incorrect sequence of actions or neglect of preparation. For example, if the battery is discharged below 12.4 V or at the time of training the consumers are turned on (headlights, air conditioning), the ECU will record incorrect data - and the throttle will “twitch” even more at idle. This article contains a step-by-step algorithm for Murano Z50 taking into account the nuances of a particular model, as well as answers to questions about why the adaptation is reset and how to check the result without a diagnostic scanner.

When to teach the throttle on a Murano Z50

The adaptation procedure is not required “on a schedule,” but when specific symptoms appear or after certain interventions. Here are the key signs that it’s time to train the damper:

  • 🔧 Floating speed at idle (from 500 to 1500 rpm) after the engine has warmed up.
  • ⚡ Jerks during acceleration, especially at low speeds (1st–2nd gear).
  • 🚗 RPM freezing after releasing the gas (for example, when braking the engine).
  • 🔴 Error P0505 or P0507 (high idle speed) on the instrument panel.
  • 🔄 After cleaning the damper or replacing the throttle assembly.
  • 🔋 After disconnecting the battery for more than 30 minutes (the ECU resets the adaptation).

Important: if the speed fluctuates only on a cold engine, the problem may be coolant temperature sensor (ECT), and not in the damper. Before training, check its resistance with a multimeter (at +20°C it should be ~2.3–2.8 kOhm).

⚠️ Attention: Do not confuse damper adaptation with its mechanical adjustment. On Murano Z50 The damper is controlled electronically - there are no screws for manual adjustment. Attempts to “tighten” anything will lead to damage to the drive.

Preparing for training: 5 mandatory steps

Neglect of preparation is the main reason for unsuccessful adaptation. For example, if the engine is not warmed up to operating temperature, the ECU will write parameters for the “cold” mode, and the throttle will not operate correctly when warmed up. Here's what to do to start of the procedure:

  1. Warm up the engine to operating temperature (the temperature gauge arrow should be strictly in the middle). On Murano Z50 this is ~85–95°C.
  2. Turn off all consumers: headlights, air conditioning, heated seats, radio. Even charging your phone through the cigarette lighter can distort the results.
  3. Check battery voltage: must be at least 12.4 V (with the engine off). If it is lower, recharge or use a jump charger.
  4. Make sure there are no errors in the ECU. If they are burning Check Engine, VDC Off or SLIP, first read the codes and eliminate the cause.
  5. Use quality gasoline. If you recently refueled at a questionable gas station, the procedure may not yield results due to detonation.
📊 How often do you perform throttle adaptation?
  • Only after cleaning or repair
  • Once a year for prevention
  • Only when symptoms appear
  • Never did

Feature Murano Z50: If adaptation is interrupted (for example, due to accidental pressing of the gas pedal), the ECU may block learning for 10–15 minutes. In this case, turn off the engine, wait 10 minutes and repeat the procedure.

Step-by-step instructions: how to train the damper on a Murano Z50

Adaptation algorithm for Murano Z50 different from newer models Nissan (For example, Qashqai J10 or X-Trail T31). This uses the “closed position” method, which requires precise timing. Here is the tested sequence:

Stop the engine, turn off the ignition, wait 10 seconds

Turn the ignition on (do not start the engine), wait 3 seconds

Within 5 seconds, fully press and release the gas pedal 5 times (all the way!)

Wait 7 seconds, then press and hold the accelerator pedal all the way

After 20 seconds (Check Engine light comes on), release the pedal

Start the engine and let it idle for 20 seconds

Turn off the ignition, wait 10 seconds and start the engine again-->

Visually the process looks like this:

  1. Step 1: Stop the engine, turn off the ignition. Wait 10 seconds - this is necessary for the ECU to complete all background processes.
  2. Step 2: Turn on the ignition (position ON, but do not start the engine). Wait 3 seconds - all indicators on the dashboard should go out (except Check Engine, if it was burning before).
  3. Step 3: Within 5 seconds Fully press and release the gas pedal 5 times (all the way to the floor!). Important: the interval between presses must be the same (~1 second).
  4. Step 4: Wait exactly 7 seconds, then press the gas pedal all the way and hold.
  5. Step 5: Through 20 seconds on the instrument panel will light up (or start flashing) Check Engine - this is a signal that adaptation has taken place. Release the pedal.
  6. Step 6: Start the engine and let it run 20 seconds at idle. The revolutions may fluctuate a little - this is normal.
  7. Step 7: Turn off the ignition, wait 10 seconds and start the engine again. Now the speed should stabilize in the range 650–750 rpm.

If after adaptation the speed still fluctuates, check:

  • 🔌 Throttle connector condition — oxidation of contacts can distort the signal.
  • 🧲 Damper position sensor (TPS) - if there is a malfunction, it gives an error P0120.
  • 💨 Air leak through cracks in the pipes or gasket of the intake manifold.
💡

If after training the speed hangs at 1500–2000 rpm, turn off the engine, remove the battery terminal for 5 minutes and repeat the procedure. This will reset stuck data in the ECU.

Common mistakes and how to avoid them

Even experienced owners Murano Z50 make mistakes when adapting the damper. Here are the top 5 mistakes and their consequences:

Error Consequences How to fix
Partial pressure of the gas pedal (not all the way) The ECU does not detect the extreme positions of the throttle → jerks during acceleration Repeat the procedure, making sure that the pedal rests on the floor.
Interruption of the procedure (for example, due to the headlights being on) Partial recording of parameters → unstable speed Reset the battery terminal for 10 minutes and repeat the training
Cold engine adaptation The ECU records parameters for low temperature → floating speed after warming up Warm up the engine to 85–95°C and repeat the procedure
Using the brake pedal during training The ECU perceives this as a signal for emergency mode → error P0505 Carry out training without pressing the brake
Low battery voltage (<12.4 V) Unstable power supply to the ECU → failure to record parameters Charge the battery or use a jump charger

Pay special attention throttle position sensor (TPS). On Murano Z50 it often fails after 150–200 thousand km. Check it with a multimeter:

  • 🔧 Between contacts 1–2 (food) must be 5 V.
  • 🔧Between 2–3 (signal) when the damper is closed - 0.3–0.7 V, when open - 4–4.7 V.
⚠️ Attention: If after training the damper the speed still does not stabilize, and an error appears in the ECU P0122 (low signal level TPS), the sensor needs to be replaced. On Murano Z50 original fits Nissan 22680-AL50A or equivalent Hitachi A2600-00020.

Diagnostics after training: how to check the result

It is not enough to simply carry out adaptation - you need to make sure that the ECU has recorded the parameters correctly. Here are 3 ways to check:

  1. Visual speed control:
    • 🔹 At idle (without load), the speed should be 650–750 rpm.
    • 🔹 When turning on the air conditioner or headlights - no more 800–850 rpm.
    • 🔹 After releasing the gas (for example, when braking the engine), the speed should smoothly drop to idle, without freezing.
  2. Test drive:
    • 🚦 When you smoothly press the gas, acceleration should be linear, no failures.
    • 🔄 There should be no jerking when changing gears (especially from 1st to 2nd).
    • 🛑 When braking the engine, the speed should not “get stuck” at 1500–2000 rpm.
  3. Scanner check (if any):
    • 📊 Parameter Throttle Position when the damper is closed there should be 0%, when open - 100%.
    • 📊 Idle Air Control Valve (idle air valve) should show 20–40 steps at idle.

If the speed still fluctuates, but there are no errors, the problem may be:

  • 🕳️ Air leak through cracks in the pipes or gasket of the intake manifold.
  • 🔥 Dirty injectors - on Murano Z50 It is recommended to clean them every 60–80 thousand km.
  • 🛢️ Faulty mass air flow sensor (MAF) - check its performance at idle (should be ~2.5–3.5 g/s).
What to do if adaptation does not help?

If after 2-3 attempts to train the damper the symptoms remain, the problem lies deeper:

1. **Check the compression** in the cylinders - low compression (less than 10 bar) leads to unstable idle.

2. **Inspect the spark plugs** - on Murano Z50 recommended NGK IFR6A11 or Denso IT16. Worn spark plugs cause misfires.

3. **Diagnose the ignition coils** - a faulty coil gives an error P030X (where X is the cylinder number).

4. **Check the fuel pump** - the pressure in the rail should be 3.5–4 bar (at idle).

If everything is in order, but the speed fluctuates, the ECU may need to be updated (relevant for cars with mileage >200 thousand km).

Throttle training without the gas pedal: an alternative method

On some Murano Z50 (especially with a motor VQ25DE) the standard procedure does not work due to the peculiarities of the ECU firmware. In this case, you can use an alternative method via diagnostic connector (located under the steering wheel, to the left of the pedals). Requires a scanner with support Nissan Consult (For example, Launch CReader or ELM327 with the program Nissan DataScan).

Algorithm:

  1. Connect the scanner to the connector OBD-II.
  2. Turn on the ignition (do not start the engine).
  3. From the scanner menu, select Special Functions → Throttle Valve Learning.
  4. Follow the instructions on the screen (usually you need to press the gas pedal all the way down and hold for 10-15 seconds).
  5. Once completed, turn off the ignition, wait 10 seconds and start the engine.

The advantage of this method is that the scanner itself controls the time intervals and voltage, which reduces the risk of errors. However, if you do not have diagnostic equipment, use the standard accelerator procedure (described above).

💡

An alternative method via a scanner is suitable for Murano Z50 with “capricious” ECUs, but requires special equipment. If you don’t have a scanner, use the manual method, but strictly follow the time intervals.

Frequently asked questions about throttle valve adaptation

Is it possible to train the throttle on a Murano Z50 with a VQ25DE (2.5L) engine in the same way as on a VQ35DE (3.5L)?

Yes, the learning algorithm is the same for both engines. The only difference is that on VQ25DE Due to the lower volume, floating rpm may be more noticeable. If after adaptation the speed is still unstable, check idle air valve (IACV) - on 2.5-liter engines it is more often clogged with carbon deposits.

After the throttle training, the Check Engine light came on with error code P0505. What to do?

Error P0505 (Idle Control System Malfunction) after adaptation usually means:

  • 🔌 Incorrect execution of the procedure (for example, the gas pedal was not pressed all the way).
  • 🔧 Idle air valve malfunction (IACV) - try cleaning it with carb cleaner.
  • 🕳️ Air leak through cracks in the pipes or gasket of the intake manifold.

First, reset the error using a scanner or disconnecting the battery for 10 minutes, then repeat the training. If the error returns, diagnose it IACV and the tightness of the intake tract.

Do I need to train the damper after replacing the air filter?

No, replacing the air filter does not require adapting the damper. However, if the filter was heavily dirty, and you change it after a long run (for example, 30–50 thousand km), it is recommended:

  1. Clear mass air flow sensor (MAF) a special cleaner (for example, Liqui Moly Luftmassensensor-Reiniger).
  2. Check status throttle valve — if there is carbon deposits, clean it.
  3. Only after cleaning the damper or MAF adaptation may be required.
How much does it cost to train the damper in the service for Murano Z50?

At official dealerships Nissan the damper training procedure costs from 1,500 to 3,000 rubles (depending on the region). In independent services - 800–1,500 rubles. However, if you know how to use a scanner or are willing to follow instructions, you can do it yourself for free.

Please note: the service may offer “comprehensive cleaning” of the damper with adaptation for 3,000–5,000 rubles. If the damper is really dirty, this is justified. If not, just training is enough.

Is it possible to drive with a non-adapted throttle?

Technically it is possible, but this will lead to:

  • 🔥 Increased fuel consumption (up to +1–2 l/100 km).
  • 🚗 Jerking during acceleration, especially at low speeds.
  • 🔧 Accelerated wear of the transmission due to unstable speed.
  • 🔴 Errors appearing P0505, P0507, which can put the ECU into emergency mode.

If the damper is not adjusted after cleaning or repair, the problem will get worse. For example, on Murano Z50 with mileage >150 thousand km this can lead to catalyst overheating due to incorrect air-fuel mixture.