2002 nissan altima 1102 engine code
Nov 30, 2010 at 6:06 PM
engine code
2002 NISSAN ALTIMA
PETER POKORSKI
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DTC P1102: MASS AIRFLOW SENSOR
Description
The Mass Airflow (MAF) 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.
Possible Causes
Malfunction is detected when voltage from MAF sensor is constantly about one volt when engine is running. Possible causes are:
• MAF sensor circuit open or shorted.
• Defective MAF sensor.
Fail-Safe Mode
When this malfunction is detected, ECM enters fail-safe mode. MIL will illuminate, and engine speed will not rise more than 2400 RPM due to fuel cut.
© 2008 Mitchell Repair Information Co., LLC.
Description
The Mass Airflow (MAF) 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.
Possible Causes
Malfunction is detected when voltage from MAF sensor is constantly about one volt when engine is running. Possible causes are:
• MAF sensor circuit open or shorted.
• Defective MAF sensor.
Fail-Safe Mode
When this malfunction is detected, ECM enters fail-safe mode. MIL will illuminate, and engine speed will not rise more than 2400 RPM due to fuel cut.
© 2008 Mitchell Repair Information Co., LLC.
Dec 2, 2010 at 4:21 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.