The instrument cluster of Ford Focus is an intelligent module which communicates with the Powertrain Control Module and shows the data using its gauges and trip meter display. The cluster has a test mode for diagnostics use. This document lists the most understandable test displays.
To exit the instrument cluster test mode, just turn off the power
(to position I or 0). The only thing what happens
when you visit the test mode is that the trip meter will be reset.
Note that this document applies to the year 2004
model of Ford Focus. The tricks may work also on older Focuses but
there may be differences in the displays / count of button presses
required. This document does not apply to the new Ford Focus (2005-).
A single press after the DTC display turns the trip meter into a digital speedometer in miles per hour (press the button once more to switch the digital speedometer to km/h). You will recognize the speedometer displays from the decimal point ("000.0").
With this feature you can test how
odd is to drive (e.g. some French) cars with a digital speedometer --
however, must remember to enter the test mode again every time you
start the car.
Pressing the reset button four times (only one press in the
documentation) in the temperature display
activates the integrated voltage meter. The voltage display begins with
letter "b". Old cars had battery voltage gauges -- this way
you can show the same information on your Focus dashboard.
can be used to eventually check the battery state when the car is
parked in extreme conditions for a long time. (To access the test mode
you do not need to start the engine, turning the key to position II
If you have the Focus trip computer, you can see the fuel volume in liters/gallons. You do not need to cycle the power off - on, just keep the "S" button of the trip computer pressed until an intermittent test tone starts. Then press the S button five times to see the fuel volume display.
Note that this digital fuel volume display has no filtering -- it
changes immediately when you drive through a curve or tilt the car
because the fuel moves in the tank.
To switch back to the normal trip computer displays, just press the
normal "INFO" button.