DTC P0112: Intake Air Temperature Circuit Low Input

OUTLINE OF DIAGNOSIS
Detect the open or short circuit of intake air temperature sensor.

Judge NG when out of the standard value.
COMPONENT DESCRIPTION

Fig 1: Intake Air Temperature Sensor Cross Sectional View And Temperature-Resistance Graph (Low Input)
Courtesy of SUBARU OF AMERICA, INC.

ENABLE CONDITION

ENABLE CONDITIONS

Secondary Parameters	Enable Conditions
Ignition switch	ON

GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.

DIAGNOSTIC METHOD

Judge NG when the continuous time until completing the malfunction criteria below becomes more than the time (2.5 seconds) needed for diagnosis. Judge fail safe NG when the continuous time until completing the malfunction criteria below becomes more than the time (0.1 seconds) needed for diagnosis. Judge OK and clear the NG when the malfunction criteria below are not completed.

Judgment Value

JUDGMENT VALUE

Malfunction Criteria	Threshold Value
Output voltage	"LESS THAN EQUAL TO" 0.1 V

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as malfunction occurs.

DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
Make the intake air temperature 40°C (104°F).
ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)