– Fuel level is between 15% and 85% full. Specific drive traces for Chrysler vehicles. Note: Due to the limited preconditions provided with this drive trace, NCVECS recommends using the monitor Depending on your engine size, a different procedure may apply.– Cold start (Note: cold start temperature is undefined)ġ) Warm engine up for five minutes (must reach closed loop)Ģ) Drive (with steady throttle) at a speed between 40 and 60 mph for 8 minutes.Ĥ) Drive (with steady throttle) at a speed above 20 mph for 2 minutes.ĥ) Turn key off, leave off for ten minutes (to run O2 sensor heater monitor). – Idle for two minutes with the brake depressed, transmission in drive (Or on a manual transmission, in Neutral with the clutch pedal depressedĪgain, meeting all the above criteria can be a challenge. – Accelerate at part throttle to 55mph and maintain speed for 5 minutes – Start the engine, and allow the engine to idle – Turn off all accessories, including the A/C and the blower fan. – engine has run for 6-8 minutes off idle in order to initiate test – The barometric pressure more than 74 kPA For example, on a 2003 Chevy C1500 2WD truck with a 4.8L V8 – VIN V), the following conditions would have to be met before attempting to complete the catalyst monitor: That said, yes, you can complete the steps separately as long as all other pre-requisites for completing the monitor have been met. The Bureau of Automotive Repair recognizes that competing the EVAP monitor can be difficult, so your 2003 Silverado will pass the OBD II portion of the smog inspection with an incomplete EVAP monitor if the “Check Engine” (MIL, Service Engine…, etc) is not commanded on, and all other monitors are complete. Again, don’t press the clutch or brakes or shift gears. This will perform the same diagnostics as in step 5. 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. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. Hold a steady speed of 88km/hr (55mph) for five minutes. This will perform the same diagnostics as in step 3. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. This will test the O2 heater, Passive Air, Purge “No Flow”, Misfire and if closed loop is achieved, Fuel Trim. The more electrical load you can apply the better. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run. In order to be classified as a cold start the engine coolant temperature must be below 50☌ (122☏) and within 6☌ (11☏) of the ambient air temperature at startup. To perform an OBDII Driving cycle do the following: A complete driving cycle can be done in under fifteen minutes. The following is the recommended driving cycle for General Motors.Ī complete driving cycle should perform diagnostics on all systems.
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