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Home >> Lexus >> 1998 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0110: Intake Air Temperature (IAT) Sensor Circuit >> Circuit Description

Circuit Description

The IAT sensor is a thermistor built into the MAF sensor to monitor temperature of air flowing through MAF sensor. Based on IAT sensor signal, ECM increases fuel injection volume to improve driveability during cold engine operation. If DTC P0110 is set, ECM will operate in fail-safe mode, in which intake air temperature is assumed to be 68°F (20°C). DTC P0110 is set when ECM detects an open or short in IAT sensor circuit. Possible causes are:

NOTE: If DTCs P0110, P0115, P0120 and P1410 are output together, inspect ECM terminal E2 (ground) circuit for an open. Repair as necessary. See appropriate wiring diagram in SYSTEM WIRING DIAGRAMS article.
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