DTC P0101 Mass or Volume Air Flow Circuit Range / Performance Problem
The mass air flow meter uses a platinum hot wire. The mass air flow meter consists of a platinum hot wire, a temperature sensor and a control circuit installed in a plastic housing. The mass air flow meter hot wire and temperature sensor (located in the intake air by-pass of the housing) detect changes in the intake air temperature.
The hot wire is maintained at the predetermined temperature by controlling the current flow through the hot wire. This current flow is then related as the output voltage of the mass air flow meter.
The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the predetermined temperature.
|DTC Detection Condition
|After engine is warmed up, condition (a) continues for more than 10 seconds at idling (2 trip detection logic):
(a) Mass air flow meter output more than 2.2 V
|Mass air flow meter
|Conditions (a) and (b) continue for more than 6 seconds with engine speed at 2,000 rpm or more (2 trip detection logic):
(a) VTA more than 0.1 V
(b) Mass air flow meter output less than 0.25 V
|1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101)
Connect the intelligent tester to the DLC3.
Turn the ignition switch on (IG) and turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Display (DTC Output) Proceed to P0101 and other DTCs A P0101 B
If codes other than P0101 are output, perform troubleshooting for those DTCs first.