Mass Air Flow Sensor Installation Tips
Contents
1. CARDONE rofech_ Supporting Today s Professional Technician RZ ass Mass Air Flow Sensor Installation Tips PVeyeliter yitelipm Vehicles equipped with vane or mass air flow sensors Identification and installation problems QUESTIONS ANSWERS TIPS amp HINTS Q What function does the MAF VANE AIRFLOW sensor perform A The airflow sensor measures the amount of air flowing into the engine This information is used by the engine computer to calculate fuel delivery How does a malfunctioning MAF VANE AIRFLOW sensor affect vehicle operation Hesitation stalling poor fuel economy or poor engine performance How can determine if the sensor is bad Start the engine and tap lightly on the unit If tapping causes an engine malfunction or intermittent operation the unit is faulty and must be replaced Visually inspect a MAF for damage PO O What goes bad in VANE type units Worn vane assembly cracked housing or cracked printed circuit board Inspect the vane door for binding If possible measure electrical resistance as vane is operated manually the resistance should change smoothly zO What goes bad in MAF sensors SCAN FOR Cracked circuit boards burned sensing element poor solder joints TESH TE VDE defective conformal coat or loose printed circuit board components zO What should be done to protect the replacement unit Check for related trouble codes stored in the engin2. e computer correct as necessary Inspect the wiring harness and connectors for damage Check for proper voltage and ground Vehicles with external MAF VANE AIRFLOW relays MUST be checked for proper operation Inspect inlet hose ducts for looseness and cracks Check for air way obstructions and replace air filter if necessary Be sure outlet hose duct is not loose or cracked Problems here can allow unmetered air to enter engine intake resulting in poor engine performance Finally be sure to follow supplied installation instructions Refer to your vehicle service manual for other installation procedures specific to your vehicle zO For other ProTech publications visit www cardone com CARDONE Industries Inc 5501 Whitaker Ave Philadelphia PA 19124 1799 JDA3044 PT 74 0002V
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