P0101
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Loss of performance.
Mass Air Flow Circuit. Performance Problems.
Fault symptom
On-Board Diagnostics
Type of diagnosis:
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Once per driving cycle.
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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 700-1100 rpm.
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The mean value of 5 rpm measurements must not exceed a difference of 30 rpm.
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The difference between the ambient temperature and the intake air temperature must be max 60°C
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Intake air temperature should be between -40°C - +80°C.
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Injection quantity should be 3-15 mm
3
/C.
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The mean value of 5 injections must not exceed 1 mm
3
/C and EGR flow is 0%.
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The difference between the ambient temperature and the intake air temperature must be max 100°C.
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No crankshaft position sensor DTCs.
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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 continues to work with a substitute value of 1200 mg/cyl for the mass air flow sensor. EGR control is 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.
