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DTC P0111 INTAKE AIR TEMPERATURE CIRCUIT RANGE/PERFORMANCE

DTC P0111 INTAKE AIR TEMPERATURE CIRCUIT RANGE/PERFORMANCE

OUTLINE OF DIAGNOSIS

Detect the malfunction of intake air temperature sensor output property. Judge NG when the intake air temperature is not varied whereas it seemed to be varied from the viewpoint of engine condition.

COMPONENT DESCRIPTION


(1)

Air flow sensor

(3)

Resistance (Ω)

(A)

Air

(2)

Intake air temperature sensor

(4)

Intake air temperature °C (°F)



ENABLE CONDITION

Secondary Parameters Enable Conditions
Coolant temp. before engine start

< 30°C (86°F)

Coolant temperature

> 95°C (203°F)

Battery voltage

≥ 10.9 V

Continuous time when the vehicle speed is less than 60 km/h (37 MPH)

600 seconds or more



GENERAL DRIVING CYCLE

Perform the diagnosis when the vehicle speed condition is completed after idling from starting the cooled engine.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 1 second.

Judgment Value

Malfunction Criteria Threshold Value
Output voltage difference between Max. and Min.

< 20 mV (It is equal to approx. 0.5°C (0.9°F) around 25°.)



Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

Malfunction Criteria Threshold Value
Output voltage difference between Max. and Min.

≥ 20 mV



DTC CLEAR CONDITION


When the OK idling cycle was completed 40 times in a row

When “Clear Memory” was performed


MALFUNCTION INDICATOR LIGHT CLEAR CONDITION


When the OK driving cycle was completed 3 times in a row

When “Clear Memory” was performed


FAIL SAFE

Intake air temperature sensor process: Intake air temperature is fixed at 20°C (68°F).

ECM OPERATING AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)