Nissan Repair: Air Flow Sensor 2000 GU 3.0litre Patrol, air flow sensor, mass airflow sensor


Question
I have had 2 failures with the air flow sensor within 3 days of being fitted. The checks that haave been done show the correct voltage at terminals 4 and 2. Voltage at terminal 1 is only 1 volt and does not change. Fault code show Air flow Sensor and no other problem.
Each time it has happened I was going uphill, in 3rd gear at 3000rpm. The Patrol has 191000km and I have had no previous problems.  

Answer
Graham,

A couple of things here can cause the problem.  The first is the ground for the mass airflow sensor and that means tracing the wires back and making sure the ground functions properly.  The second is the harness itself where is could be damaged.  While you are performing your check wiggle the harness.  Third is there have been many defective mass ariflow sensors on the market that are defective right from the box.  Check things in this order and you should find the problem.  Email me back if you need more.