Troubleshooting

DTC P0101 Mass Air Flow Circuit Range/Performance Problem





CIRCUIT DESCRIPTION
The air flow meter consists of a platinum hot wire, thermistor and a control circuit installed in a plastic housing. The hot wire air flow meter works on the principle that the hot wire and thermistor located in the intake air bypass of the housing detect any changes in the intake air temp.
The hot wire is maintained at the set temp. by controlling the current flow through the hot wire. This current flow is then measured as the output voltage of the air flow meter.
The circuit is constructed so that the platinum hot wire and thermistor provide a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the set temp.





DETECTING CONDITION





WIRING DIAGRAM

Step 1:

INSPECTION PROCEDURE