P1226 - FAULT CODE - OBD2

P1226 Code failures by brands

P1226 INFINITI, NISSAN: CLOSED THROTTLE POSITION LEARNING PERFORMANCE PROBLEM

Description of DTC code P1226

The electronic throttle control actuator consists of a throttle control motor and the Throttle Position Sensor (TPS). This sensor reacts to throttle valve movements.

The Throttle Position Sensor is basically defined as a potentiometer that converts the throttle valve position to an output voltage that is sent to the Engine Control Module (ECM). In addition, this sensor detects at what speed the throttle valve opens and closes and that data is also provided to the ECM.

The Engine Control Module determines the current throttle valve opening angle based on the signals received. As a result, the ECM adjusts the throttle with the goal of the corresponding valve opening angle reacting to the driving condition. If the learning of the throttle position when closed is not completed successfully, it will be interpreted as a performance problem and the P1226 OBD2 fault code will be set.

Symptoms of fault code P1226

Check Engine lamp comes on.
Trouble starting the engine.
Increased exhaust emissions.
Limited acceleration.

Causes of OBD2 P1226

The reasons for which the P1226 OBDII diagnostic code is set are:

The electronic throttle control actuator circuit wiring (Position Sensor 2) may have been damaged.
The electronic throttle control actuator (TP sensor 2) may be faulty.

Possible solutions of the DTC code P1226

The steps to follow to correct the DTC P1226 OBD2 code are as follows:

As a first step consult the Technical Service Bulletins.
By using an automotive scanner you should check if there are any DTCs configured that indicate problems with a Throttle Position Sensor. If you detect such codes, perform the diagnosis of these codes.
Inspect the throttle position sensor circuit wiring. If you discover damage caused by burns or wear, make repairs or replacements as necessary.
Check the electronic throttle control actuator (TP sensor 2) circuit connections for damage. Likewise, check the integrity of this sensor. If you discover inconsistencies, make the appropriate adjustments.