Volkswagen Golf 2013 Service page 121

An air quality check is carried out before starting the free accel‐
eration. When doing this, no emission probe must be in the
exhaust tail pipe. Otherwise measuring errors or faulty signals
could occur during further measurements.
– When the air quality check is carried out, insert emission probe
into exhaust tail pipe
Free acceleration:
It is automatically switched to display for "Free acceleration".
During "Free acceleration" the engine is revved up to rev limit
without load as quickly as possible.
The "Free acceleration" test consists of at least four throttle
bursts.
Free acceleration - phase 1:
– Follow instructions on display -arrow A- and -arrow C-.
– Maintain idling speed in engine speed range indicated
-arrow D-.
The remaining time to perform measurement is displayed
-arrow B-.
Note
The emissions probe must be in the exhaust tail pipe.
♦
If the speed deviates from engine speed range indicated, the
♦
measurement starts again.
Measurement can be skipped using
♦
emissions test has failed.
Free acceleration - phase 2:
– Follow instructions on display -arrow B-.
– Depress accelerator pedal fully when prompted and hold until
the prompt for idling is shown on display.
Free acceleration - phase 3:
– Remove foot from accelerator pedal when the prompt for idling
is shown on display -arrow B- and run engine at idling speed.
The test results and information on the latest "Free acceleration"
are shown on display -arrow A-. If the measured values are not
OK, here you can obtain information why the "Free acceleration"
has failed.
Note
If the field is coloured white the measured value is within tol‐
♦
erance.
If the field is coloured red the measured value is outside tol‐
♦
erance.
If the field is coloured yellow, the measured value is outside
♦
tolerance. However, this can be assessed by the user.
Further throttle bursts:
button, i.e. the exhaust
→
Golf 2013 ➤
Maintenance - Edition 10.2012
5. Exhaust emissions test
117