P0101 00

Mass air flow sensor malfunction (variation from calculated air mass)

SDI CGM SVG Version 1.58 Date:2018-12-07 2 0 5 3 1 2 J3 7 G 7 J4 0 ( R 3 ) +3 0 22 9 7 2 7 4 M 2 3 M 2 6 J4 5 B 2 9 A 1 F205PE03 050502 8 7 8 5 8 6 3 0 CPU CPU 5 8 9

Fault symptom

Fault indicator lamp (for further information see WIS Fault diagnosis, general)

Cruise control not working.

Limp home

Possible driveability problem.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage must be between 11 - 16 V.
Vehicle speed above 30 km/h for more than 60 s accumulated time.
Coolant temperature between 71°C and 115°C.
Engine speed between 1400 and 4000 rpm.
No fuel shut-off.
Air mass 7 - 20 g/s.

Fault criteria:

Conditions for test 1, 2, 3 or 4 are fulfilled.
Test 1
The mass air flow sensor shows a value 12% lower than the calculated one while multiplicative adaptation is greater than 17%.

Test 2
The mass air flow sensor shows a value 12% higher than the calculated one while multiplicative adaptation is less than -17%.

Test 3
The mass air flow sensor shows a value 30% lower than the calculated one.

Test 4
The mass air flow sensor shows a value 30% higher than the calculated one.

Dependent:


P0107, P0108
P0112, P0113
P0237, P0238

System reaction to a fault:

The system continues to function with a calculated air mass instead of the value from the mass air flow sensor.
Boost pressure adaption is blocked and reset.
Limited acceleration and idle function.
Cruise control blocked.
Secondary air pump not active, if fitted.

OK report:

Diagnosis completed without fault report.

Fault handling:

Type III
(See section Fault handling III, "Other emission-related components and functions" for more information.)

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

The DTC indicates that the value from the mass air flow sensor has been deemed unreliable after comparison with a calculated value. This could be due to an air leak or a faulty mass air flow sensor.
The air mass signal is compared to a calculated value under light, normal and continuous engine loads. The calculated value is derived from the pressures given by the pressure sensors in the intake system.
First check the integrity of the intake system. Then continue with fault diagnosis.
If DTC P0171 or P0172 is stored, it is cleared by P0101.

Functions in the diagnostic tool related to the fault:

Test value:
Air Mass
Airmass / Combustion
Airmass / Combustion Calculated

(See also description of readings/activations in diagnostic tool)