Autel MaxiCheck EPB - Manual (Page 135)

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Figure 11.43
e) Check the exhaust backpressure with engine running at cut-off
speed. The tool will read off the actual backpressure value and
compare with the upper limit. (Figure 11.44). Select OK to end
the test or Cancel to return to previous menu.
Figure 11.44
 If the engine is not running at cut-off speed, the tool will display
a warning message. (Figure 11.45) Select OK to repeat the test.
Figure 11.45