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Failed Smog Test

Honda Odyssey Drive Cycle

Hello, I can't get my Honda Odysses to pass the smog check. The readiness flags (emission monitors) are not complete. I've driven my Honda for a few days now and it still won't cycle through to get it to pass the smog. The emissions are ok, it just doesn't complete the drive cycle enough times. There are no emission failures and nothing indicating a failed smog part.


You will need to drive your Honda Odyssey for at least 200-300 miles through various driving conditions in order to complete the required Emission Monitors. Your Honda’s emission monitors are internal self-tests which the Engine Control Unit performs to ensure your Odyssey is not polluting and is running efficiently. The entire process of self-testing various emission control systems is called a Drive Cycle.


The following is a Honda OBDII Drive Cycle Pattern. (Obey all traffic laws while performing drive cycles. Perform acceleration steps only on highways)

COLD START: Begin from Cold Start, and ignition in OFF position for at least 1 hour. Insure your Honda’s fuel tank is between 1/4 and 3/4 full and engine coolant temperature must be below 122°F and within 11°F of the ambient air temperature. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.

IDLE TIME: Run your Honda’s engine (do not drive) for 2 1/2 minutes with the air conditioner on and rear defroster on. During this period the ECU will be running the Oxygen Sensor Heater self-test, Air Injection System Passive Air test, EVAP Purge "No Flow" test, Misfire Detection.

ACCELERATE: Turn off the air conditioner and rear defroster and begin driving. As soon as possible apply half throttle until 55mph is reached. The ECU will now run self-tests on the Misfire Detection, Fuel Trim, and EVAP Purge Flow.

HOLD STEADY: Now hold your vehicle speed steady at 55mph for three minutes. During this time the Oxygen Sensor O2 response, Air Intrusive (AIS System), EGR Flow, Purge Valve, Misfire Detection, and Fuel Trim diagnostics will be performed.

DECELERATE: During this step you want to slowly let off the accelerator pedal. Do not brake or shift your Honda in order to slow down. It is important to let the vehicle coast along gradually slowing down to 20 mph. The ECU will once again self-test the EGR System, EVAP Purge System and Long Term Fuel Trims.

ACCELERATE: Go ahead and accelerate again at 3/4 throttle until 55-60mph is reached. This will perform the same self tests as during the first acceleration step.

HOLD STEADY: Hold steady speed once again. This time at 55mph for five minutes. During this time, in addition to running the self-tests as during the first HOLD STEADY step, the ECU will perform the catalyst monitor diagnostics. If the catalyst (Catalytic Converter) is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst,or in order to Complete the CAT Monitor.

DECELERATE: This will perform the same diagnostics as in the first Deceleration. Remember not to press your Honda’s brake or shift gears during deceleration.
This should complete the drive cycle on your Honda Odyssey. To ensure all monitors are complete use a scan tool to view the monitors. You may want to complete the drive cycle 2-3 times.

posted by SmogTips Support 03-24-2014 04:08 PM
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