Ford Transit Owner's Manual page 183

The system is not a substitute for correct
tire maintenance.
You must maintain the correct tire
pressures, even if low tire pressure has not
illuminated the warning lamp.
The tire pressure monitoring system has a
system malfunction indicator to warn you
when the system is not operating correctly.
The malfunction indicator and low tire
pressure warning lamp have a combined
function. When the system detects a
malfunction, the warning lamp will flash
for approximately one minute and then
remain illuminated. This sequence will
occur every time you switch the ignition on
while the malfunction remains. The system
has detected a fault that requires service.
When the malfunction indicator is
illuminated, the system may not be able
to detect or signal low tire pressures. A
malfunction may occur for a variety of
reasons, including the installation of a
replacement tire or wheel that prevents
the system from functioning correctly.
Always check the tire pressure monitoring
system malfunction warning after
replacing one or more tires or wheels on
your vehicle. Make sure the replacement
tires or wheels allow the system to
continue to function correctly. See When
the Temporary Spare Tire is Installed
in this section.
Transit (TTG) Vehicles Built From: 06-01-2014, Vehicles Built Up To: 31-12-2014, CG3612en enGBR, Edition date: 12/2013
Wheels and Tires
Changing Tires With a Tire
Pressure Monitoring System
You should always have tires serviced by
an authorized dealer.
Note: Each road wheel and tire is fitted with
a tire pressure sensor located inside the
wheel and tire assembly cavity. The pressure
sensor attaches to the valve stem. The tire
covers the pressure sensor and it is not
visible unless the tire is removed. Take care
when changing the tire to avoid damaging
the sensor.
Understanding the Tire Pressure
Monitoring System
The system measures the pressure in the
four road tires and sends the tire pressure
readings to your vehicle.
The system detects this lower pressure as
being significantly below the correct
inflation pressure and the warning lamp
illuminates. You must inflate the tires to
the correct pressure.
When the Temporary Spare Tire is
Installed
If you need to replace a road wheel and
tire with the temporary spare wheel, the
system will continue to identify a defect.
This is to remind you to repair the damaged
road wheel and tire and refit the repaired
road wheel and tire assembly to your
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