DTC: P1102

Search Bulletins/Recalls for P1102

Trouble diagnosis name: Mass air flow sensor circuit range/performance problem

Component Description

The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the ECM. The temperature of the hot film is controlled by the ECM a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change.

DTC detecting condition:

• A voltage from the sensor is constantly approx.1.0V when engine is running.

Possible cause:

• Harness or connectors (The sensor circuit is open or shorted.)
• Mass air flow sensor