Traverse Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter #1
I am new to the forum and couldn't find a reliable link as to why my issues seem to be appearing.

In late April I bought a New 2018 Traverse with only 200 miles on it and had it trailered to me in California.
I have driven it an additional 300 miles in the last 10 days.
I went to get the smog done as it was purchased out of state (WA) and although it has all of the CA emissions components, the OBDII readout says the O2 sensor and EVAP are "Not Ready".
The tech at the smog shop told me to drive it around a bit to clear a drive cycle (50-100 miles) and a Chevy Tech told me the same.

Has anyone here had this issue and does anyone have any advice other than what was given to me by both of these techs?

Thanks!

Mike
 

·
Registered
Joined
·
11,276 Posts
Some of the test require certain parameters to be met- for the test to run.
For example- some require a cold engine- and gas tank to be at 85%.


Thats why they recommend you drive 300-500 miles.
In that time- the parameters may be met.
I read posts where owners have driven quite a bit- and the test have not been performed.
 

·
Registered
Joined
·
11,276 Posts
General Motors 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:

  • 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.
 

·
Registered
Joined
·
11,276 Posts
The GM EVAP monitor procedure is a known trouble spot for all GM vehicles (regardless of any tunes or the AFM Disabler being installed). It can take several cold soak drive cycles AND a tank of gas to set at times just due to all the complicated parameters that have to be set in order for the monitor to transition from NOT READY to READY
Below is the GM procedure:
Inspection/Maintenance (I/M) Complete System Set Procedure
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.

Description
The purpose of the Inspection/Maintenance (I/M) complete system set procedure is to satisfy the enable criteria necessary to execute all of the I/M readiness diagnostics and complete the drive cycles for those particular diagnostics. When all I/M monitored diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform the Inspection/Maintenance (I/M) Complete System Set Procedure if any I/M System Status indicators are set to NO.

I/M Data List
To determine if the I/M readiness diagnostic tests can be run this ignition cycle, use a scan tool to observe the I/M monitor enabled parameters in the I/M Data List.

Conditions for Meeting a Cold Start
• The ignition voltage between 11-18 volts.
• The barometric pressure (BARO) is more than 75 kPa.
• The start-up engine coolant temperature (ECT) is between 4-30°C (39-86°F).
• The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).
• The difference between the IAT and the ECT is less than or equal to 6°C (10.8°F)
• The ambient air temperature is between 4-30°C (39-86°F).
• Fuel level is between 15-85 percent
• Without RPO LMG--The fuel alcohol content is less than 15 percent.
• With RPO LMG--The fuel alcohol content is less than 87 percent.

Circuit/System Verification
Review the Inspection/Maintenance (I/M) System Status indicators with a scan tool. All I/M System Status indicators should report YES.

Inspection/Maintenance (I/M) System Set Procedure
Important: Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Once the engine is started, do NOT turn the engine OFF for the remaining portion of the set procedure.

  1. Ensure that the vehicle meets the conditions for a cold start listed above.
    ⇒ If the evaporative emission (EVAP) I/M System Status indicator displays NO, perform the EVAP Service bay test if available.
    ⇒ If the EVAP Service bay test is NOT available, it may take up to 6 drive cycles, with up to 17 hours between drive cycles, for the EVAP I/M System Status indicator to transition to YES.
    ⇒ If the O2S Heater System Status indicator displays NO, ensure that the ignition has been turned OFF for at least 10 hours.
  2. Set the vehicle parking brake and ensure the vehicle is in park for automatic transmission or neutral for manual transmission.
  3. Turn OFF all accessories; HVAC system, other electrical loads, including aftermarket/add-on equipment, etc.
  4. Start and idle the engine for at least 2 minutes and until 65°C (149°F) is achieved.
  5. Run the engine for 6.5 minutes within the following conditions:
    • MAF parameter between 4-30 g/s
    • Engine speed steady between 1000-3000 RPM
  6. Return the engine to idle for 1 minute.
  7. Apply and hold brake pedal, and shift to Drive for automatic, or apply clutch pedal for manual and operate the vehicle within the following conditions for 2 minutes:
    • Depress the accelerator pedal until TP Sensor angle is more than 2 percent.
    • MAF signal between 15-30 g/s
    • RPM steady between 1200-2000 RPM

    Important
    : Do NOT touch the accelerator pedal during the idle period. A change in TP Sensor angle or an increase in engine speed may invalidate this portion of the test.
  8. Release the accelerator pedal and shift the vehicle to Park for automatic, or Neutral and release clutch pedal for manual, and allow the engine to idle for 2 minutes.
  9. Quickly depress the accelerator pedal until TP Sensor Angle is more than 8 percent and return to idle, repeat 3 times.
  10. Allow engine to idle for at least 2 minutes.
  11. Release the parking brake and drive vehicle at 24 km/h (15 mph) or slower for 2 minutes.
  12. Continue to drive the vehicle for at least 5.5 miles between 45-112 km/h (28-70 mph) with the vehicle reaching at least 80 km/h (50 mph).
  13. Release the accelerator pedal for at least 2 seconds. This will allow the vehicle to enter decel fuel cut-off.
  14. Depress the accelerator pedal until the TP Sensor angle is increased 3-20 percent and maintain a safe speed for 1 minute.
  15. Safely stop the vehicle, with the engine in drive for automatic or in neutral with the clutch pedal depressed and parking brake applied for manual, idle for 2 minutes.
  16. Shift to Park for automatic and apply the parking brake, or neutral and release clutch pedal for manual.

    Important: Do NOT disturb the vehicle or turn ON the ignition until told to do so. Disturbing the vehicle may invalidate this portion of the test.

  17. Turn OFF the ignition and exit the vehicle. Do NOT disturb the vehicle for 45 minutes.
  18. Observe the Inspection/Maintenance (I/M) System Status with a scan tool. All of the I/M System Status indicators should display YES.

    ⇒ If the EVAP I/M System Status indicator displays NO turn OFF the ignition for 17 hours, ensure that the vehicle meets the conditions for a cold start, and repeat steps 12-18 six more times, or until the EVAP I/M System Status indicator transitions to YES. If the indicator continues to display NO, refer to the Inspection/Maintenance (I/M) System DTC Table to identify the DTCs that did not run. Follow the Conditions for Running the DTC in order to set the EVAP I/M System Status indicator

    ⇒ If any of the I/M System Status indicators display NO, refer to the Inspection/Maintenance (I/M) System DTC Table for the indicator which did not display YES. The I/M System DTC Table identifies the DTCs associated with each I/M System Status Indicator. Follow the Conditions for Running the DTC in order to set the associated status indicator.
 

·
Registered
Joined
·
3 Posts
Discussion Starter #5
General Motors 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:

  • 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.
Thanks for the info.

The issue I'm facing is that in CA I only have 20 days to get the new vehicle registered and it already took 2 weeks to get the WA title and now I have to drive an extra 100+ miles before I can pass smog and register the vehicle. This process is just getting tight on my timeline.

Thanks,

Mike
 

·
Registered
Joined
·
1,701 Posts
Deleted
 

·
Registered
Joined
·
129 Posts
...
In late April I bought a New 2018 Traverse with only 200 miles on it and had it trailered to me in California.
...
You mention it was "new" at 200 miles and a 2018 being sold close to a 2020 MY start.

Any issues with it or why it was still sitting somewhere unsold? Or if it was a owner return for some reason? Or the dealer demo?
 

·
Registered
Joined
·
1,701 Posts
deleted
 

·
Registered
Joined
·
3 Posts
Discussion Starter #9
You mention it was "new" at 200 miles and a 2018 being sold close to a 2020 MY start.

Any issues with it or why it was still sitting somewhere unsold? Or if it was a owner return for some reason? Or the dealer demo?
I am unsure if it was a dealer demo vehicle, but I will find out. If that was the case, is there a reset that needs to be preformed to open all tests for SMOG?

One thing to note is that after driving it for about 80 miles yesterday the EVAP was ready to test, but still not ready for O2.

I will drive it around a bit more today and see if this is something I can clear.
 

·
Registered
Joined
·
11,276 Posts
The op never came back to update.
But I changed out the battery on my Equinox on Sunday
Obviously this reset the Smog parameters.
I drove the vehicle yesterday morning. I scanned, and only the 2 test- O2 and EVAP- are left to be performed. I dont have a smog test due, so im in no hurry for those test to be performed. But yeah- those parameters have to be met for the test to take place.
My wife then took the vehicle to work. Ill scan to see if her drive ran the test.
 

·
Registered
Joined
·
2,997 Posts
The op never came back to update.
But I changed out the battery on my Equinox on Sunday
Obviously this reset the Smog parameters.
I drove the vehicle yesterday morning. I scanned, and only the 2 test- O2 and EVAP- are left to be performed. I dont have a smog test due, so im in no hurry for those test to be performed. But yeah- those parameters have to be met for the test to take place.
My wife then took the vehicle to work. Ill scan to see if her drive ran the test.
I'm guessing he did what they suggested and it worked, so he saw no reason to come back. Very few people ever seem to come back and provide an update on their resolution.
 

·
Registered
Joined
·
11,276 Posts
I Checked the Equinox. The O2 test was performed yesterday on her drive.
Only EVAP remains, and everything else on the Scanner screen is Green
 
  • Like
Reactions: G.Frog

·
Registered
2020 High Country
Joined
·
291 Posts
EVAP test/drive cycles are initiated with gas tank between 1/4 and 3/4. Steady cruise of at least 40 mph, fully warmed up after a cold start.
 

·
Registered
Joined
·
11,276 Posts
If I get bores this afternoon, I may have to check fuel level and go for a drive,.. =)
 
  • Like
Reactions: repairman54
1 - 14 of 14 Posts
Top