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:
-
|
Battery voltage should be 10.2-15.8 V.
|
-
|
P0102, P0103, P1636 or P1637 should not be detected.
|
-
|
Engine speed should be 1500-4500 rpm.
|
-
|
Rpm changes between two measurements should not exceed a difference of 40 rpm.
|
-
|
Intake air temperature should be 20-90 °C.
|
-
|
Injection quantity should be 15-40 mm
3
/C.
|
-
|
The difference between two injectors must not exceed 3mm
3
/C and EGR flow is 0%.
|
Fault criteria:
-
|
The difference between calculated and actual air mass/combustion exceeds 30%.
|
Dependents:
System reaction to a fault:
-
|
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.
|
OK report:
-
|
Fault criteria not fulfilled.
|
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:
-
|
Read value:
Airmass / Combustion
|
See also description of read value under
"Read Values" menu
for more information.