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35
5.5 Retrieving I/M Readiness Status
I/M Readiness function is used to check the operations of the
Emission System on OBD2 compliant vehicles. It is an excellent
function to use prior to having a vehicle inspected for
compliance to a state emissions program.
CAUTION - By clearing trouble codes you also clear the readiness
status for the individual emission system readiness tests. In order
to reset these monitors, the vehicle must be driven through a
complete drive cycle with no trouble codes in memory. Times for
reset vary depending on vehicle.
Some latest vehicle models may support two types of I/M
Readiness tests:
A. Since DTCs Cleared - indicates status of the monitors since the
DTCs are erased.
B. This Drive Cycle - indicates status of monitors since the
beginning of the current drive cycle.
An I/M Readiness Status result of “NO” does not necessarily
indicate that the vehicle being tested will fail the state I/M
inspection. For some states, one or more such monitors may be
allowed to be “Not Ready” to pass the emissions inspection.
“OK” -- Indicates that a particular monitor being checked has
completed its diagnostic testing.
“INC” -- Indicates that a particular monitor being checked has
not completed its diagnostic testing.
“N/A” -- The monitor is not supported on that vehicle.
1) Use the UP/DOWN scroll button to select I/M Readiness from
Diagnostic Menu and press OK button. (Figure 5.3)
2) Wait a few seconds while the scan tool validates the PID MAP.
3) If the vehicle supports both types of tests, then both types will be
shown on the screen for selection. (Figure 5.21)
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