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To set readiness codes our testing shows that two driving cycles are required, with one cycle being from an overnight cold start.
Each cycle needs to run about 10 minutes from when the vehicle is warm and there are some specific driving behavior that is required.
| • | A cold start is when the ambient temperature, IAT and ECT are all within 20F of each other. Note that you can leave the vehicle overnight, have the sun hit the ambient sensor in the grill, and fail to do a cold start. The vehicle may need to be powered off, without any ignition activity, for 6 hours or more. |
| • | The vehicle must be started without keying the ignition on first. ie depress the clutch and then press the engine start button. Do not switch to ACC or RUN mode first. |
| • | If any error codes are disabled then generally readiness codes will not set. |
| • | Short and long term trims need to be relatively close to 0%. |
| • | If one readiness does not set that may prevent other readiness tests from being performed. |
| • | If the ambient temperature is below 32F or over 100F then readiness will not set. |
| • | Some tests will not be performed at elevation. |
| • | After a reflash the vehicle will not perform a cold test even if the temperatures indicate that it should. It needs to be left for 6 hours. |
| • | Honda documentation does not indicate a specific fuel level is required but we have found 1/2 to 3/4 tank works. |
The 10 second test
| • | Most tests require a period of steady throttle for a certain time with the MAP being with certain limits. If you cannot drive with a steady foot then readiness will never set. Cruise control may not help unless the road is very flat. |
| • | Start at 55 mph. It is acceptable to go faster than 55 mph, but if the vehicle speed drops then the test will be invalidated. |
| • | Hold a steady load for at least 10 seconds. |
| • | Lift off the throttle for at least 5 seconds without braking. |
| • | If you go outside the MAP window, the test will be invalidated. |
| • | If you reduce load and go into over fuel cut off, the test will be invalidated. |
Readiness Notes
| • | "Fuel System" will set hot or cold within 4 miles. |
| • | "Comprehensive component" will set hot or cold within one minute from starting. No driving is required. |
| • | "Heated catalyst" will set hot or cold within 4 miles. |
| • | "Evaporative system" requires a cold start and specific driving behavior. |
| • | "Oxygen sensor" will set hot or cold within 4 miles. |
| • | "Oxygen sensor heater" will set immediately upon a cold start. |
| • | "EGR system" will set hot or cold within 4 miles. |
Hot test or after a reflash
| • | Idle for at least one minute |
| • | Drive until engine is fully warm. |
| • | Perform a 10 second test with MAP below 80 kPa |
| • | Perform a 10 second test with MAP between 80 and 100 kPa |
| • | Perform a 10 second test with MAP over 100 kPa |
| • | All readiness apart from EVAP and O2 sensor heater should be set. |
Cold test
| • | Idle for at least one minute |
| • | O2 sensor heater should be set. |
| • | Drive until engine is fully warm and for at least 10 minutes |
| • | Perform a 10 second test with MAP below 80 kPa |
| • | Perform a 10 second test with MAP between 80 and 100 kPa |
| • | Perform a 10 second test with MAP between 100 and 120 kPa |
| • | Perform a 10 second test with MAP over 120 kPa. This will build considerable speed so use a high gear. |
| • | EVAP readiness may be set at this point. |
| • | Idle for at least 5 minutes. |
| • | Switch off the engine and do not disturb for an hour. |
| • | EVAP readiness should be set. If not, the cold start criteria was not met or error codes have been disabled. |
| • | If O2 sensor heater has not set, it should set on the next cold start after driving for about 1 minute. |
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