P0102

P0102 00

Mass Air Flow Circuit. Low Input







Fault symptom
- CHECK ENGINE
- Cruise control not working.
- Limp home

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Battery voltage must be between 11 - 16 V.
- Ignition ON.

Fault criteria:
- Short-circuit to ground/+B or open-circuit results in 0 Hz on the input.
(Low frequency results in high flow, e.g. open-circuit 230 g/s)

Dependent:
- None

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 switched off.

OK report:
- Fault criteria NOT fulfilled for 2 s.

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:
- Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:
- Air Mass
(See also description of readings/activations in diagnostic tool)