User Manual

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This section covers all OBD II compliant vehicles. Non OBD II vehicles
manufactured by GM, Ford and Chrysler are covered in Parts 4, 5 and 6,
respectively.
✓ If an Operating Error message displays, refer to “Error Messages” on
page 7-3 and check the following :
❒ make sure the OBD II connector is securely attached, and the ignition key
is ON. Cycle the ignition key to OFF for 10 seconds, then ON. This may be
required to reset the computer. If required, select YES to try again.
❒ the vehicle fails to link because it does not support OBD II diagnostics.
Check the emissions label on the vehicle for OBD II compliance.
✓ On the initial link to the vehicle, the scan tool checks the status of the
I/M Monitors and displays it regardless of the function selected.
I/M READINESS
The I/M Readiness (Inspection and Maintenance) function is used to
check the operations of the Emission System on OBDII vehicles. I/M
Readiness is an excellent function to use prior to having a vehicle
inspected for compliance to a state emissions program.
During normal driving conditions, the vehicle’s computer scans the
emission system. After a specific amount of drive time (depending on
vehicle), the computer’s "monitors" will decide if the vehicles emission
system is working correctly or not. When the "monitors" record:
• "OK" and check engine light has not come on - vehicle will likely
pass emissions test and the system being checked is working
properly.
• "INC" (Incomplete) - vehicle was not driven enough and needs to be
driven until monitors record "READY."
• "N/A" - vehicle does not support that monitor.
Some states MAY NOT require all monitors to be listed as “READY”
to pass the emissions test. Check with state testing site for exact
requirements. All states will fail a vehicle who has the "check engine
light" lit at time of test.
Depending on vehicle, disconnecting or a discharged battery may
erase trouble codes and clear status monitors.
The vehicle may support more than one type of I/M Readiness. The first type
shows the status of the monitors since the DTCs were last erased. They are
displayed under the heading SINCE DTCs CLEARED. The second type
shows the status of the monitors since the start of the current drive cycle, and
are displayed under the heading THIS DRIVING CYCLE. If the monitors are
not supported for THIS DRIVING CYCLE, then the scan tool only shows
monitors for SINCE DTCs CLEARED with no header on line 1.
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