What the P1113 code means?
P1113 is a OBD-II manufacturer-specific code for an open circuit issue with the intake air temperature (IAT) sensor. The sensor contains a semiconductor device that changes resistance based on air temperatures coming into the intake manifold. The computer monitors voltage and resistance from the sensor and if the signal is erratic, the vehicle will assume there is an open or shorted circuit and trigger a P1113.
What causes the P1113 code?
To know real cause of P1113 based of if this code is present in your two-wheel drive vehicle, suspect a faulty PCM or programming error. In most four wheel drive applications the four-wheel drive switch is used to switch between two and four wheel drive operation, as well as between low and high ranges.
What are the symptoms of the P1113 code?
1. The recessed surfaces of the reflector provide voltage interruptions and these interruptions are input to the PCM via the signal wire
2. This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns
3. A suitable OBD-II scanner (or code reader), a digital volt/ohmmeter, and an oscilloscope will be most helpful in performing a successful diagnosis
4. Should all system circuitry and sensors check out and the transmission is in good working order, suspect a faulty PCM but keep in mind that PCM failure is rare and PCM replacement will require reprogramming.
Common mistakes when diagnosing the P1113 code:
Because all P1XXX codes are manufacturer specific, it's critical to have any code read by a professional-grade OBD-II scanner to ensure you're fixing the correct problem. For example, a P1113 code in a general motors vehicle is for the intake resonance switchover solenoid control circuit.
What repairs can fix the P1113 code?
Repairing and cleaning intake air temperature sensor wiring.
Replacing the intake air temperature sensor.
Replacing the engine computer.