P0101
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Loss of performance.
Mass Air Flow Circuit. Performance Problems.
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
Enable criteria:
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Battery voltage should be 10.2-15.8 V.
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P0102, P0103, P1636 or P1637 should not be detected.
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Engine speed should be 1500-4500 rpm.
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Rpm changes between two measurements should not exceed a difference of 40 rpm.
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Intake air temperature should be 20-90 °C.
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Injection quantity should be 15-40 mm
3
/C.
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The difference between two injectors must not exceed 3mm
3
/C and EGR flow is 0%.
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Fault criteria:
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The difference between calculated and actual air mass/combustion exceeds 30%.
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Dependents:
System reaction to a fault:
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The control module will continue to work with a substitute value of 1200 mg/cyl for the mass air flow sensor. The following limitations apply: Pedal position sensor adjustable to max 40 %, fuel quantity max 30 mm
3
/combustion and EGR and boost pressure control are switched off.
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OK report:
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Fault criteria not fulfilled.
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Fault handling:
(See section
Fault handling III, other emissions-related components and functions
for more information)
Diagnostic help
Fault diagnosis concerns a check of the intake system.
Functions in the diagnostic tool related to the fault:
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Read value:
Airmass / Combustion
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See also description of read value under
"Read Values" menu
for more information.
