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Subaru Legacy Service Manual: Dtc p0101 mass or volume air flow sensor "a" circuit range/performance

Subaru Legacy Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0101 mass or volume air flow sensor "a" circuit range/performance

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Improper idling

Engine stalls.

Poor driving performance

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

STEPCHECKYESNO

1.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed-

Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)

Replace the mass air flow and intake air temperature sensor. Mass Air Flow and Intake Air Temperature Sensor

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of air flow sensor output properties.

Judge as a low side NG when the air flow voltage indicates a small value regardless of running in a state where the air flow voltage increases. Judge as a high side NG when the air flow voltage indicates a large value regardless of running in a state where the air flow voltage decreases. Judge air flow sensor property NG when the Low side or High side becomes NG.

2. COMPONENT DESCRIPTION

(A)

Air

(1)

Air flow sensor

(3)

Voltage (V)

(4)

Amount of intake air (kg (lb)/s)

(2)

Intake air temperature sensor

3. EXECUTION CONDITION

Secondary Parameters

Execution condition

Low

Engine coolant temperature

≥ 60 °C (140 °F)

Engine speed

≥ 1500 rpm

Throttle valve opening angle

≥ 12 ° (CVT model)

≥ 10 ° (MT model)

Intake manifold pressure

≥ 73.3 kPa (550 mmHg, 21.7 inHg) (CVT model)

≥ 66.7 kPa (500 mmHg, 19.7 inHg) (MT model)

High

Engine coolant temperature

≥ 60 °C (140 °F)

Engine speed

525 rpm — 875 rpm (CVT model)

550 rpm — 850 rpm (MT model)

Throttle valve opening angle

< 5.7 °

Intake manifold pressure

≥ 58.7 kPa (440 mmHg, 17.3 inHg)

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after idling.

5. DIAGNOSTIC METHOD

Judge as NG when Low side or High side becomes NG.

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

Low

Output voltage

< 1.22 V (CVT model)

< 1.17 V (MT model)

High

Output voltage

≥ 2.1 V

Time Needed for Diagnosis:

Low: 5000 ms

High: 5000 ms

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

Dtc p0102 mass or volume air flow sensor "a" circuit low
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Other materials:

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