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DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE

DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE

OUTLINE OF DIAGNOSIS

Detect the malfunction of air flow sensor output property. Judge Low side NG when the air flow voltage indicates low value in spite of the driving condition that the air flow voltage might be high; otherwise, judge High side NG when the air flow voltage indicates high value in spite of the driving condition that the air flow voltage might be low. Judge air flow sensor property NG when the Low side or High side becomes NG.

COMPONENT DESCRIPTION


(1)

Air flow sensor

(A)

Air

(2)

Intake air temperature sensor

(3)

Voltage (V)

(4)

Intake air volume (kg/s)



ENABLE CONDITION

Secondary Parameters Enable Conditions
Engine coolant temperature

≥ 75°C (167°F)



GENERAL DRIVING CYCLE

Perform the diagnosis continuously after idling.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when the continuous time of completing the malfunction criteria below becomes more then the time needed for diagnosis.

Judgment Value

Malfunction Criteria Threshold Value
Low side NG

Output voltage

< 1.5 V

Engine speed

≥ 2,500 rpm

Throttle angle

≥ 15°

Intake manifold pressure

≥ 53.3 kPa (400 mmHg, 15.7 inHg)

High side NG 1

Output voltage

≥ 2.5 V

Engine speed

550 ←→ 1,200 rpm

Throttle angle

< 1.92°

Intake manifold pressure

< 46.7 kPa (350 mmHg, 13.8 inHg)

High side NG 2

Output voltage

≥ 2.0 V

Engine speed

550 ←→ 1,200 rpm

Throttle angle

< 1.92°

Intake manifold pressure

< 46.7 kPa (350 mmHg, 13.8 inHg)

Diagnosis for fuel system

Rich side malfunction



Time Needed for Diagnosis:

Low side

3 seconds

High side

10 seconds



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

Normality Judgment

Judge OK the when the malfunction criteria below are completed.

Judgment Value

Malfunction Criteria Threshold Value
Low side NG

Output voltage

≥ 1.5 V

Engine speed

≥ 2,500 rpm

Throttle angle

≥ 15°

Intake manifold pressure

≥ 53.3 kPa (400 mmHg, 15.7 inHg)

High side NG

Output voltage

< 2.5 V

Engine speed

550 ←→ 1,200 rpm

Throttle angle

< 1.92°

Intake manifold pressure

< 46.7 kPa (350 mmHg, 13.8 inHg)

Diagnosis for fuel system

Rich side normal



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

None

ECM OPERATING AT DTC SETTING

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