The Readiness code should change to YES when the test is done. NOTE: Extremely high or low ambient temperatures may prevent this test from running. If the test is interrupted before completion, do all of the test steps from the beginning. If a small leak is detected during testing, a minimum of 3 drive cycles may be required before the EVAP.. If you recently disconnected the battery or cleared the codes, you can check the status of the readiness monitors. On many vehicles the readiness monitors reset after 20-150 miles of driving. If the readiness monitors don't reset , there may be a problem with the fuses , electrical wiring, battery, or parts related to operating temperature.
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Checking Readiness Monitors. Use a Scan Tool: Connect your OBD2 scan tool and check the I/M readiness status. Ensure most or all monitors show "complete" or "ready" status. FAQs about I/M Readiness Monitors. What does I/M Readiness mean? Indicates if a vehicle's emissions control system has completed self-tests. What does OBD.. How to Check I/M Readiness Using a Scanner. Using car diagnostic tool, you can check I/M readiness by selecting the Readiness Monitor function. The scanner will communicate with the vehicle's ECM and display the results for each monitored system. Ready: The system has passed its self-diagnostic checks and is prepared for the emissions test.
