Intake Air Temperature Sensor
2018 Jeep Wrangler · 3.6L V6
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Integrated into Mass Airflow Sensor housing on intake tube between air filter box and throttle body
Pins
2-pin connector
Timebase
1s/div
Voltage Scale
1V/div
Trigger
Not applicable for DC signal
Wiring
Violet/White (signal to PCM) and Black/Light Blue (sensor ground), part of MAF sensor connector
Expected Voltage Range
At Idle
1.5V to 4.5V
At Higher RPM
1.5V to 4.5V
Expected Pattern
Steady DC voltage inversely proportional to intake air temperature, negative temperature coefficient
Known-Good Waveform
At ambient temperature of 68°F, expect 2.5-3.0V. Voltage decreases as intake air warms from engine heat or hot weather conditions. Signal should be stable without fluctuations, typically reading 1.5-2.5V at normal operating conditions with heat-soaked engine.
Common Failure Patterns
Fixed voltage at 4.9-5.0V regardless of temperature
Cause: Open circuit in IAT sensor element or broken wire in MAF harness
Voltage reading near 0V constant
Cause: Short to ground in sensor circuit or internal sensor failure
Related DTCs: P0112
Unrealistic temperature readings or slow response to temperature changes
Cause: Contaminated sensor element from oil vapors or dirt buildup on sensor tip
Related DTCs: P0111
Diagnostic Tips
On JK Wranglers, IAT sensor is integral to the MAF sensor and cannot be replaced separately. Contamination from aftermarket oiled air filters is common and can cause erratic readings. Never use carburetor cleaner on MAF/IAT; use only MAF-specific cleaner.
Related Diagnostic Trouble Codes
P0110P0111P0112P0113P0114
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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