Autel MaxiCheck EPB - Manual (Page 133)

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Figure 11.39
c) Check the exhaust backpressure with engine running idle. The
tool will read off the actual backpressure value and compare
with the upper limit. (Figure 11.40). Select OK to continue the
test or Cancel to return to previous menu.
Figure 11.40
 If the engine is not running at idle speed, the tool will display a
warning message. (Figure 11.41) Select OK to repeat the test or
select Cancel to exit.