DTC: P0100

Search Bulletins/Recalls for P0100

Trouble diagnosis name: Mass air flow (MAF) sensor

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 acertain 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 high voltage from the sensor is sent to ECM under light load driving condition.

• A low voltage from the sensor is sent to ECM under heavy load driving condition.

• An excessively high voltage from the sensor is sent to ECM.
• An excessively low voltage from the sensor is sent to ECM.

Possible cause:

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

• Intake air leaks

• Mass air flow sensor may be faulty