Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

Extreme high or low ambient temperatures may prevent the EVAP System Tests from initiating. A loose fuel cap may cause a test to abort or fail and prevent the I/M System Status from updating. A failed or aborted diagnostic will require the vehicle to cool down in order to meet the enable criteria for another drive cycle.

If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the diagnostic does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information. This will give an indication of why the test does not complete. Some diagnostics may abort due to changes in the conditions while the test is running. For example, changes in engine load, such as a cooling fan or an A/C compressor clutch turning ON, may cause the diagnostic to abort.

Inspection/Maintenance (I/M) Evaporative Emission (EVAP) System Set Procedure

Step	Action	Yes	No
1	Did you perform the Inspection/Maintenance (I/M) System Check?	Go to Step 2	Go to Inspection/Maintenance (I/M) System Check
2	IMPORTANT: At least 3 drive cycles, with a minimum of 17 hours between drive cycles, are required for the EVAP System Status to update to YES. Repeat steps 1-9 until the minimum requirement of drive cycles is met. Ensure the vehicle is within the Conditions for Running specified in the supporting text. Turn OFF all of the accessories, e.g., A/C, blower fan, etc. IMPORTANT: Once the engine is started, DO NOT turn the engine OFF for the remainder of the procedure. Start the engine and idle for 2 minutes. CAUTION: Refer to Road Test Caution in Cautions and Notices. Accelerate at part throttle to 72 km/h (45 mph) with this speed maintained until the engine reaches operating temperature. This may be up to 10 minutes depending on the start up coolant temperature. Continue the operating conditions for an additional 6 minutes after the engine reaches operating temperature. Decelerate to 0 km/h (0 mph). Allow the engine to idle for 2 minutes. IMPORTANT: Ensure that the ignition remains OFF for 1 hour in order for the control module to perform vacuum testing. Turn OFF the ignition for 1 hour. Turn ON the ignition after 1 hour. Did the EVAP System Status update to YES?	Go to Step 5	Go to Step 3
3	Observe the DTC Information with a scan tool. Does the scan tool indicate any failed DTCs?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	Go to Step 4
4	Refer to the Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to complete this diagnostic. Observe the Not Ran Since Code Cleared display with a scan tool. Determine which of the DTCs required for a YES status has not run. Enter the DTC number in the Specific DTC menu of the scan tool. Ensure that the vehicle is within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC. Repeat the procedure in step 2 of the inspection/maintenance (I/M) evaporative emission (EVAP) system set procedure until the scan tool indicates the DTC has run. Repeat steps 4-6 for any additional required DTCs that have not run. Observe the I/M System Status display with a scan tool. Did the EVAP System Status update to YES?	Go to Step 5	Go to Diagnostic Aids
5	Observe the Emission Related DTC portion of the I/M System Status display with a scan tool. Does the scan tool indicate any Emission Related DTCs set?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	System OK