MEASURES FOR
OPTIMUM
PRECISION
Mass air flow sensors (MAF) are sensitive
and precise. CAMBIARE talks to VITAL
NEWS about common issues and causes
for misdiagnosis.
MAF sensors essentially measure the amount of air that flows into
the engine to help create an optimal air-to-fuel ratio that allows the
vehicle to perform at its full potential and efficiently. Also known as air
mass sensors, it continues on being a critical component to modern
vehicles as emissions and fuel efficiency, stay at top priority for vehicle
manufacturers. With such exacting tolerances, challenges are likely to
follow.
CONDITIONS FOR PRECISION
The precision that the MAF sensor is expected to deliver at makes it
a powerful but delicate device; it can be easily contaminated by dirt,
debris and oil. Contamination can occur as early as 18,000 to 25,000
miles, depending on the model of the vehicle. Sensors for turbo-diesel
engines in particular are subjected to high stresses since air flow and
speeds are very high.
A defective or clogged MAF sensor can supply incorrect input signals
to the engine control unit (ECU) which, as a result, controls other
components incorrectly.
AVOID MISDIAGNOSIS
If an ECU is reporting a MAF fault code, it does not necessarily mean
that the unit is at fault. Unmetered air entering the engine from a split
intake hose, crank case ventilation breather pipe or even a sticking EGR
valve can trigger a MAF fault code.
It is important to be mindful that the engine breather and vacuum hoses
are in good condition and securely located before and after replacement
of the MAF sensor. Leaks in any of these hoses can lead to misdiagnosis.
TOP TIP
When replacing a MAF sensor, it
is good practice to replace the air
filter at the same time. By doing
this, installers reduce the chance
of premature failure and time
consuming warranty claims.
CAMBIARE QUALITY ASSURANCE AND SUPPORT
With product quality at the centre of Cambiare’s priority, all Cambiare
MAF sensors are tested in-house, prior to dispatch. Only units that meet
Cambiare’s strict performance criteria receive a ‘QC PASSED’ stamp
as a sign of approval.
Examples of MAF sensors from Cambiare’s wide range
A CLUE TO MORE ISSUES
A faulty MAF sensor is often indicative of a problem somewhere else in
the system. After all, it is highly unlikely for a sensor to clog on its own.
Clogged sensors are often indicative that there are leaks in the air intake
system. Dirt particles can enter with the intake of air and damage
the sensitive sensor element. Excessive oil mist from the crankcase
ventilation, water ingress and exposure to road salt can further
exacerbate the issue.
VITAL NEWS ISSUE 49
To further support customers with their technical enquiries, Cambiare
has a dedicated technical specialist team that can be reached via the
tech hotline, 0845 543 8280.
Cambiare parts are backed by a 2-year/30,000-mile warranty. Available
via same/next-day delivery, Cambiare parts are fully catalogued on the
Cambiare website (www.cambiare-ve.com), the F:Drive and MAM
Autocat. For more information, please speak to your local Cambiare or
FPS representative.
MASS AIR FLOW SENSORS 7