Nissan Error P1122: Complete Troubleshooting Guide

Error P1122 - one of the most common problems in cars Nissan with electronic throttle. It indicates a malfunction in the engine management system associated with throttle adaptation. Owners Qashqai, X-Trail, Juke and other models often encounter this error after cleaning the throttle, resetting the battery, or when components are worn out.

In this article we will look in detail at what it means P1122 Nissan specific (as opposed to universal interpretations), how to correctly diagnose the problem without an expensive scanner, and what steps to take to repair it. We will pay special attention to the nuances of adapting the throttle valve - a procedure that many perform incorrectly, aggravating the breakdown.

What does error code P1122 mean on Nissan?

Code P1122 in cars Nissan stands for Throttle Position Sensor (TPS) Circuit Low Input — low signal from the throttle position sensor. However, in the context of brands Nissan/Infiniti this code more often indicates:

• 🔧 Failed throttle adaptation after cleaning or replacing components
• 🔋 ECU Memory Reset (for example, after disconnecting the battery)
• 🛠️ Mechanical wear throttle body or TPS sensor
• 🔌 Wiring problems between ECU and throttle body

It is important to understand that Nissan uses electronic throttle control (ETCS), where adaptation of the damper position occurs programmatically. If this procedure fails, the ECU records an error P1122, even if the damper is mechanically intact.

⚠️ Attention: On models with engines MR20DE, QR25DE And VQ35DE error P1122 is often accompanied by floating speed at idle speed. Ignoring the problem may result in the ECU going into limp mode with limited power.

The main causes of P1122

The reasons for the error can be divided into software (related to adaptation) and hardware (mechanical/electrical). Let's look at both categories:

Reason type	Specific fault	Nissan models where it is more common
Software	Resetting adaptation after cleaning the throttle	Qashqai J10/J11, X-Trail T31/T32
Software	Incorrect damper learning procedure	Juke F15, Note E12
Hardware	Worn throttle position sensor (TPS)	Pathfinder R51, Murano Z51
Hardware	Oxidation of contacts in the throttle body connector	Teana J32, Almera N17
Hardware	Mechanical play of the damper axis	Navara D40, NP300

In practice 80% of cases P1122 are associated with the need to re-adapt the throttle. However, if the error appears after successful training, the problem lies in physical wear and tear components.

How to diagnose P1122 without a scanner?

For initial diagnostics it is not necessary to have a diagnostic scanner. Follow this algorithm:

1. Check the symptoms: The P1122 error code usually appears through unstable speed (500–1500 rpm), freezing speed after releasing gas or Check Engine light on.
2. Inspect the throttle assembly:
   • 🔍 Check the cleanliness of the damper (carbon deposits on the edges)
   • 🔌 Inspect the connector for oxidation or damage
   • 🛠️ Rock the flap with your hand - play of more than 1-2 mm is unacceptable

Reset the error manually:

1. Отключите минусовую клемму аккумулятора на 10 минут.
2. Подключите клемму обратно.
3. Заведите двигатель и дайте поработать 5–7 минут на холостых.

If the error returns, adaptation or repair is required.

For models with CONSULT-III (For example, Patrol Y62) can be used service menu to check TPS parameters. To do this:

1. Turn on the ignition (do not start the engine).
2. Press and hold the button TRIP on the instrument panel.
3. After 5 seconds, release and press it again - the service menu will appear.
4. Select an item DATA MONITOR → THROTTLE SENSOR.

⚠️ Attention: On vehicles with the system Direct Adaptive Shift Control (For example, Murano with CVT) incorrect throttle adaptation can lead to jerking when changing gears. In this case, a reset of the variator adaptation is required. after throttle settings.

Step-by-step instructions for adapting the throttle valve

The procedure for adapting (learning) the throttle to Nissan different from other brands. It's important to follow exact sequence, otherwise error P1122 will remain. Below are universal instructions for most models (Qashqai, X-Trail, Juke etc.):

The engine is warmed up to operating temperature (80–90°C)

The battery is fully charged (voltage not lower than 12.6V)

All electrical appliances (headlights, air conditioning) are turned off

Gearbox lever in position P (automatic) or neutral (manual) -->

1. Turn off the ignition and wait 10 seconds.
2. Turn on the ignition (do not start the engine) and wait 3 seconds.
3. 5 times in a row Fully press and release the gas pedal for 5 seconds. Important:
   • 🔹 Pressing must be complete (all the way).
   • 🔹 The interval between presses is no more than 1 second.

Wait 7 seconds then press the gas pedal all the way and hold it until Check Engine will not start flashing (about 10 seconds).

Release the pedal when Check Engine will light up constantly.

Start the engine and let it idle for 2-3 minutes.

If adaptation was successful, the speed will stabilize in the range 650–750 rpm. To check:

1. Apply the throttle several times - the speed should smoothly return to idle.
2. Turn off and restart the engine - error P1122 must disappear.

What to do if adaptation fails?

If after the procedure the error remains or the speed fluctuates:

1. Check the battery voltage - it should be at least 12.6V. When the battery is low, the ECU does not write new parameters.

2. Repeat the procedure, strictly observing the time intervals.

3. If adaptation fails on the 3rd attempt, the problem is mechanical part throttle or TPS sensor. Diagnostics with a scanner is required (for example, Launch X431) to check parameters Throttle Position Sensor 1/2.

Repair and replacement of components for P1122

If adaptation does not help, the problem lies in hardware. Let's look at typical repair scenarios:

1. Cleaning the throttle body

Carbon deposits on the valve and in the channels lead to mechanism jamming and distortion of sensor signals. For cleaning:

• 🧴 Use special cleaner (For example, Liqui Moly Pro-Line Drosselklappen-Reiniger).
• 🧽 Do not use metal brushes - they damage the damper coating.
• 🔧 After cleaning necessarily perform adaptation (see section above).

2. Replacing the throttle position sensor (TPS)

TPS sensor on Nissan often fails after 150–200 thousand km. Signs of malfunction:

• 📉 The speed “fails” when you press the gas.
• 🔄 Error P1122 appears immediately after reset.
• 📊 In the scanner data values TPS1 And TPS2 do not match.

To replace:

1. Remove the throttle assembly (disconnect the connector, unscrew the 4 bolts).
2. Unsolder the old sensor and solder the new one (or replace the assembly).
3. Perform damper adaptation.

⚠️ Attention: On models with engine VQ35DE (For example, Nissan 350Z) The TPS sensor is built into the throttle body and cannot be replaced separately. In this case, the entire assembly must be replaced (article: 22680-4M000 for 350Z).

3. Wiring repair

Oxidation or broken wires between the ECU and the throttle assembly is a common cause P1122 on old ones Nissan (For example, Primera P12). Check:

• 🔌 Connector on the throttle assembly (contacts 1–4 - power supply and TPS signals).
• 🔋 Wiring from the ECU to the throttle (often frays near the intake manifold).
• 📶 Presence of a short circuit to ground (call with a tester).

Features of error P1122 on different Nissan models

Although it's a mistake P1122 is universal, its manifestations and methods of elimination differ depending on the model and type of engine. Let's consider the key nuances:

Model	Engine	Features of P1122	Recommendations
Qashqai J10/J11	MR20DE, M9R	Often occurs after cleaning the throttle. May be accompanied by an error P0507 (high revs XX).	Perform adaptation twice at intervals of 10 minutes.
X-Trail T31/T32	QR25DE, MR20DD	On QR25DE The error may appear when the damper drive gear is worn.	Check the flap play manually. If the play is >2 mm, replace the unit.
Juke F15	HR16DE, MR16DDT	On turbocharged versions (MR16DDT) P1122 may block boost.	After adaptation, reset errors via CONSULT-III+.
Pathfinder R51	VQ40DE	The error is often associated with wear on the TPS sensor. May be accompanied P2101 (malfunction of the damper drive).	Replacing a sensor or assembly (article number 22680-7S000).
Navara D40	YD25DDTi	On diesel engines, P1122 may indicate problems with EGR valve.	Diagnose along with errors P0400–P0404.

On vehicles with CVT (For example, Murano Z51) error P1122 may affect switching logic. In this case, after repairing the throttle, it is necessary to reset the variator adaptations through the scanner (command CVT RELEARN).

Prevention of error P1122

To avoid reappearance P1122, follow these guidelines:

• 🔧 Clean the throttle valve every 50-60 thousand km (use cleaner for electronic throttles).
• 🔋 Avoid deep battery discharge - this resets the ECU adaptations.
• 🛢️ Use quality fuel - bad gasoline accelerates the formation of soot.
• 🔌 Check your contacts throttle assembly connectors at each maintenance.
• 📊 Watch the speed XX - their gradual increase (for example, from 700 to 900 rpm) may signal the beginning of problems with TPS.

On vehicles with gas equipment (GBO) error P1122 appears more often due to:

• 🔥 Incorrect gas ECU calibration.
• 🛢️ Poor gas quality (sulfur impurities destroy sensors).
• 🔧 Wear of the LPG gearbox, leading to unstable fuel supply.

⚠️ Attention: On Nissan with HBO, throttle adaptation must be performed separately for gasoline and gas. After switching fuel, let the engine idle for 5–7 minutes to stabilize the parameters.

Frequently asked questions about error P1122

Is it possible to drive with error code P1122?

Short term - yes, but not recommended. Driving for a long time with this error can lead to:

• 🔥 Overheating of the catalyst due to an unstable fuel mixture.
• 🛢️ Increased fuel consumption (up to 15–20%).
• 🚗 The ECU goes into emergency mode with power limitation.

On models with a CVT (Qashqai, X-Trail) Ignoring the error accelerates wear on the CVT belt.

Why does error P1122 return after adaptation?

This indicates:

• 🔧 Mechanical wear throttle valve or TPS sensor.
• 🔌 Wiring problems (open or short circuit).
• 📊 ECU malfunction (rare, but found on Nissan older than 2010).

In this case it is required scanner diagnostics with parameter checking TPS1, TPS2 And Throttle Valve Opening Angle.

How to reset error P1122 without a scanner?

Reset methods:

1. Disconnecting the battery: remove the negative terminal for 10–15 minutes.
2. Adaptation procedure: perform throttle training (see section above).
3. Trip in "hard" mode: Accelerate the car to 100–120 km/h in 3rd–4th gear, then sharply release the gas. Repeat 2-3 times - this may reset adaptations.

If the error is returned, there is a hardware problem.

How much does it cost to repair error P1122 in the service?

The cost depends on the reason:

Type of repair	Cost (RUB)
Diagnostics with a scanner	1 000–1 500
Throttle cleaning + adaptation	2 500–4 000
Replacing the TPS sensor	3,000–6,000 (with work)
Replacing the throttle assembly	8 000–15 000

On Nissan with engines VQ And VR repairs are usually more expensive due to the difficulty of accessing the throttle.

Is it possible to replace the throttle assembly yourself?

Yes, but consider the nuances:

• 🔧 On most models (Qashqai, X-Trail) replacement takes 1–2 hours.
• 🔌 It is necessary to reset adaptations through a scanner or training procedure.
• ⚠️ On Nissan with the system Direct Adaptive Shift Control (variator) after replacing the throttle, the gearbox also needs to be trained.

To replace you will need:

• 🔧 Socket wrenches for 10 and 12.
• 🧴 Throttle cleaner.
• 🔌 Diagnostic scanner (optional).