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Drive Cycle Setting
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Posted by Steve H (more from Steve H) on Thu, 31 Jan 2008 08:35:14 Share Post by Email
In Reply to: Re: computer "not ready"--failed emissions, Reb, Thu, 31 Jan 2008 08:24:33
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SYSTEM: OBD-II/EOBD
TITLE: The OBD-II Driving Cycle
A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can
be done in under fifteen minutes. To perform an OBDII Driving cycle do the following:
1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and
within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated
oxygen sensor diagnostic may not run.
2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more
electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge ”No Flow”, Misfire and if closed
loop is achieved, Fuel Trim.
3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/h (55mph) is reached.
During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
4. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air
Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast
along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be
performed.
6. Accelerate. Accelerate at ¾ throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
7. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this
time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst
is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the
catalyst.
8. Decelerate. This will perform the same diagnostics as in step 5. Again, don’t press the clutch or brakes or shift gears.
NOTES: Be aware that the specification for a driving cycle varies between the car manufacturers, this descritpion is
valid for most vehicles.
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The information in this data sheet is subject to change without notice. Autodiagnos AB shall not be liable for technical or
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