Autel MaxiCheck EPB - Manual (Page 134)

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Figure 11.41
d) Check the exhaust backpressure with engine running at 2000
rpm. The tool will read off the actual backpressure value and
compare with the upper limit. (Figure 11.42). Select OK to
continue the test or Cancel to return to previous menu.
Figure 11.42
 If the engine is not running at 2000 rpm, the tool will display a
warning message. (Figure 11.43) Select OK to repeat the test or
select Cancel to exit.