P1111 SUZUKI Possible Causes
- Faulty intake air temperature sensor
- Intake air temperature sensor harness is open or shorted
- Poor electrical connection in the intake air temperature sensor circuit
How to Fix P1111 SUZUKI Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
The P1111 code is set when the Powertrain Control Module (PCM) detects a signal voltage outside the normal operating range of the sensor.
Possible Symptoms
Illuminated check engine light (or service engine soon warning light)
P1111 SUZUKI Meaning
The Intake Air Temperature (IAT) sensor contains a semiconductor device that changes resistance based on temperature (a thermistor). The IAT sensor is mounted in the air intake passage of the engine’s air intake system. The IAT sensor has a signal circuit and a ground circuit. The Powertrain Control Module (PCM) applies a voltage (approximately 5.0 volts) to the sensor’s signal circuit. The PCM monitors changes in this voltage caused by changes in the sensor’s resistance to determine the intake air temperature.
When the intake air is cold, the sensor’s resistance (thermistor) is high and the PCM signal voltage is only slightly lowered across the sensor to ground. The PCM detects a high signal voltage (low temperature). When the intake air is hot, the sensor’s resistance is low and the signal voltage is lowered more. This causes the PCM to detect a low signal voltage (high temperature).