User guide

34 www.AutoEnginuity.com
Open (Due to Fault):
Fuel trim is coming from the hard-coded settings in the
ECM because the system is running with a stored DTC or other
fault.
Open (Due to Driving Conditions):
Fuel trim is coming from the hard-coded settings in the
ECM because the system is trying to complete its test but
hasn’t because of driving conditions.
Monitored Test Results (Mode 6)
This table is a list of all the IM monitors’ component-level test
results. This is commonly referred to as Mode 6 because of its SAE
J1979 designation. Manufacturers are supposed to allow the view-
ing of the test ID, component ID, component results, and ranges for
each subsystem that makes up a IM monitor’s results. Should your
vehicle support this feature, it can show you what results each sys-
tem has at the component-level.
A description of the data and scaling information are generally
necessary to make use of the data. Mode 6 test values and limits are
to be decimal with a range of 0 - 65535. However, some manufac-
turers have stored negative number test values and/or limits. Also
some manufacturers’ vehicle reset Mode 6 information upon key
off, as a result only data from the current driving cycle can be
accessed and the information must be obtained before engine shut-
down. The Test and Component IDs, and their respective results,
are available from the manufacturer by way of service guides or
other service information sources.
If your vehicle supports Mode 6, don’t overlook the usefulness
of this information. As an example, the Monitor Test Results below
are from a Ford Explorer. For this vehicle, Test ID 53 is the misfire
count. Each individual cylinder is represented by a component ID
of 1 - 8. In this case, cylinder six must have been misfiring with the
large reported value. Even if the Misfire IM no longer reports the
misfire condition, with Mode 6 results being stored until a MIL/IM
clearing, the information can help diagnose this hard-to-find prob-
lem.