P0102

NOTE: The MAF sensor is a combined MAF sensor and IAT sensor.


DTC P0102
Mass air flow sensor fault Drive cycle A:Signal out of range - below minimum.

DTC P0103
Mass air flow sensor fault Drive cycle A:Signal out of range - above maximum.

Possible causes by suggested order of priority:
^ MAFS contaminated.
^ Open circuit - C636/23 (UG) to C149/5 (UG).
^ Open circuit - C636/9 (RB) to C149/3 (RB).
^ 5V MAFS supply voltage C149/4 (R) to C149/3 (RB).
^ 12V MAFS supply voltage C149/2 (NK) to C149/3 (RB).
^ Connectors C149, ECM C636 (B).
^ Fuse F2 Engine Compartment Fusebox.
^ MAFS faulty.

MAFS Contaminated.
CHECK THE FOLLOWING:
^ Visually inspect the metal and plastic mesh on the upstream side of the airflow meter.

NOTE: If this mesh is contaminated then this is a good indication that the sensor film is also contaminated.

POSSIBLE FAULTS
^ MAFS Fault - Contaminated hot film sensor.

Open Circuit - C636/23 (UG) to C149/5 (UG).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open Circuit - C636/9 (RB) to C149/3 (RB).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

5V MAFS Supply Voltage C149/4 (R) to C149/3 (RB).
CHECK THE FOLLOWING:
^ 5V MAFS supply voltage C149/4 (R) to C149/3 (RB)..
ACCEPTABLE RESULTS
^ Between 4.5V and 5.5V.
DIAGNOSTIC HINTS
^ If the voltage is too high a short circuit to battery or faulty ECM should be suspected.
^ If the voltage is too low an open circuit or connector problem should be suspected.

12V MAFS Supply Voltage C149/2 (NK) to C149/3 (RB).
CHECK THE FOLLOWING:
^ 12V MAFS supply voltage C149/2 (NK) to C149/3 (RB).
ACCEPTABLE RESULTS
^ Between 11.5V and 15.0V.
DIAGNOSTIC HINTS
^ If the voltage is not present check F2 Engine Compartment Fusebox and open circuit C149/2 (NK) to C570/5 (NK).

Connectors C149, ECM C636 (B).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.

Fuse F2 Engine Compartment Fusebox.
POWER_DISTRIBUTION
^ Check for fuse not correctly inserted, fuse blown, fuse connections loose, damaged or corroded.
^ Certain diagnostics may also perform further checks to try and narrow down the fault, e.g. check if other circuits fed by the same fuse are also experiencing problems.


MAFS Faulty.
CHECK THE FOLLOWING:
^ Check MAFS by substituting with known good unit.
POSSIBLE FAULTS
^ MAFS Fault.