Possible causes

– Faulty Electric Throttle Control Actuator
– Electric Throttle Control Actuator harness is open or shorted
– Electric Throttle Control Actuator circuit poor electrical connection

Tech notes

Start by performing the “Idle Air Volume Learning Procedure”, if the problem persist the Electric Throttle Control Actuator may need to be replaced.

There is a factory service bulletin for the following Nissan models:

2002 Nissan Altima
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2002-2005 Nissan Altima Service Bulletin OBDII Code P1122

When is the code detected?

Electric throttle control function does not operate properly.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1122 NISSAN Description

Electric Throttle Control Actuator consists of throttle control motor, Throttle Position Sensor (TPS), etc. The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

NISSAN Technical Service Bulletins for P1122 code