P1239 INFINITI Possible Causes
- Faulty electronic throttle control actuator (TP sensors 1 and 2)
- Electronic throttle control actuator harness is open or shorted
- Poor electrical connection in electronic throttle control actuator circuit
How is P1239 INFINITI Code Repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check Engine Light on (or Service Engine Soon warning light)
P1239 INFINITI Meaning
The electronic throttle control actuator consists of a throttle control motor, throttle position sensor, etc. The throttle position sensor responds to throttle valve movement.
The throttle position sensor has two sensors. These sensors are a type of potentiometer that convert throttle valve position into output voltage and send the voltage signal to the Engine Control Module (ECM). Additionally, these sensors detect the opening and closing speed of the throttle valve and transmit voltage signals to the ECM. The ECM determines the current throttle valve opening angle from these signals and the ECM controls the throttle control motor so the throttle valve opening angle properly adapts to driving conditions.