TROUBLESHOOTING FOR DTC
DTC | Diagnostic item |
P0110 P0112 P0113 | Intake Air Temperature Circuit Malfunction Intake Air Temperature Low Input Intake Air Temperature High Input |
DESCRIPTION
The Intake Air Temperature (IAT) sensor is built in to the MAF sensor.The IAT sensor is a variable resistor whose resistance changes as the temperatureof the air flowing through the air intake changes. The Engine Control Module(ECM) uses the IAT sensor input to adjust fuel injector pulse width. Whenthe temperature sensed is cold, the ECM enriches fuel mixture by increasinginjector pulse width; as the air warms, the injector pulse width time is shortened.
The ECM will set P0112 and the Malfunction Indicator Lamp (MIL) willturn on if the IAT sensor indicates a temperature lower than -49?(-45?)for 0.2 seconds during two driving cycles. This check is made after the enginehas run for 4 minutes and 10 seconds and then idles for 30 seconds (with nofuel cut-off during a coast-down). This code indicates a lower than expectedtemperature is being read by the IAT sensor or ECM after the engine has beenwarmed up.
CIRCUIT DIAGRAM
TEST PROCEDURE