![]() ![]() ⇒ If the EVAP Service bay test is NOT available, it may take up to 6 drive cycles, up to 17 hours between drive cycles, for the EVAP I/M System Status indicator to transition to YES. ⇒ If the evaporative emission (EVAP) I/M System Status indicator displays NO, perform the EVAP Service bay test if available. Ensure that the vehicle meets the conditions for a cold start listed above.Once the engine is started, do NOT turn the engine OFF for the remaining portion of the set procedure. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Important: Whenever the ignition is turned ON, an ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. Inspection/Maintenance (I/M) System Set Procedure All I/M System Status indicators should report YES. Review the Inspection/Maintenance (I/M) System Status indicators with a scan tool. With RPO LMG-The fuel alcohol content is less than 87 percent.Without RPO LMG-The fuel alcohol content is less than 15 percent.The ambient air temperature is between 4-30☌ (39-86☏).The difference between the IAT and the ECT is less than or equal to 6☌ (10.8☏).The start-up intake air temperature (IAT) is between 4-30☌ (39-86☏).The start-up engine coolant temperature (ECT) is between 4-30☌ (39-86☏).The barometric pressure (BARO) is more than 75 kPa.The ignition voltage is between 11-18 volts.To determine if the I/M readiness diagnostic tests can be run during this ignition cycle, use a scan tool to observe the I/M monitor-enabled parameters in the I/M Data List. Perform the Inspection/Maintenance (I/M) Complete System Set Procedure if any I/M System Status indicators are set to NO. ![]() When all I/M monitored diagnostic tests are completed, the I/M System Status indicators are set to YES. 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. ![]() Diagnostic Procedure Instructions provide an overview of each diagnostic category.Review Strategy Based Diagnosis for an overview of the diagnostic approach.Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.Inspection/Maintenance (I/M) Complete System Set Procedure 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 The GM EVAP monitor procedure is a known trouble spot for all GM vehicles (regardless of any tunes or the AFM Disabler being installed). I hear people drive 1000's of km or miles and still do not get this stupid thing to switch to "complete". I did that specifically at night, when the highway is empty, as this requires highway driving.ĭoes anyone have any idea how to make this stupid EVAP monitor switch to "completed"? Or, perhaps, someone has a '08 Enclave-specific drive cycle procedure since I could not find it? I tried at least 3 different driving cycles I could find online for GM vehicles to get this bugger to switch to "Complete" or "Ready," just to fail every time. This sucker stays "incomplete" no matter what I do. With one exception, it has been a week of driving, and every monitor came back as "completed" within a day, with the exception of the EVAP monitor. With the exception of ONE thing: I need to do an emission test on my '08 Enclave, and after resetting the computer, all of the emission monitors went into an "incomplete" state. Currently, no codes are recorded, and everything seems to be okay. I had some repairs done to my vehicle, and the technician reset the codes. ![]()
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