2010 GMC Sierra 1500 Inspection issues
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2010 GMC Sierra 1500 Inspection issues
I have a 2010 GMC Sierra 1500 V8 5.3 engine. I replaced the battery on July 4. I went to get truck inspected on July 6. It did not Pass inspection due to Evap Sys Not Ready and O2 Sensor Not Ready. They said I needed to drive 50 to 100 miles to clear Status. I took a 120 mile road trip after I left their shop. Went back same day and I still had the same Evap Sys and O2 Sensor Not Ready. They say it’* something about the drive cycle. What do I need to due to clear these codes?
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From: Dark Side, AZ
You have to do a 'proper' drive cycle in order to initiate OBD test on all the system components.
To perform an OBDII Driving cycle do the following:
- 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.
- 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.
- Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
- 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.
- 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.
- Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
- 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.
- Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.
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