For 1990-2009 cars

### Description

The purpose of this test is to satisfy the enable criteria necessary to execute I/M readiness diagnostics for the evaporative emission (EVAP) system. The test may be used to set the I/M System Status indicators to YES. The I/M System Status display on the scan tool provides an indication of whether the control module has completed the required test. The required test is complete when either all of the DTCs comprising the test have Run and Passed, or when any one of the DTCs comprising the test has illuminated the malfunction indicator lamp (MIL). Once the test is complete, the I/M System Status display will indicate YES in the Completed column. Performing a visual inspection prior to running the EVAP test may prevent having to repeat the test. A failed or aborted test will require the vehicle to cool down in order to meet the enable criteria to run another test.

### Conditions for Running

• | The barometric pressure (BARO) is more than 75 kPa.

• | The engine coolant temperature (ECT) is 8-75°C (46-167°F).

• | The intake air temperature (IAT) is between 8-50°C (46-122°F).

• | The fuel level is between ¼ and ¾.

• | The battery voltage is between 11-16 volts.

• | The engine is in Closed Loop fuel control.

• | The vehicle has been driven for 17 minutes.

### Diagnostic Aids

Extreme high or low ambient temperatures may prevent the EVAP System Tests from initiating. Performing a visual inspection prior to running the test may prevent having to repeat the test. 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 test will require the vehicle to cool down in order to meet the enable criteria to run another test.

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 test does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information for an indication of why the test does not complete. Some tests 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 test to abort.

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 |

1. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
2. 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.

3. Start the engine and idle.

Caution: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

Important: In order for this test to run, the vehicle must operate in the following conditions:

4. Acceleration 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.
5. Continue the operating conditions for an additional 3 minutes after the engine reaches operating temperature.
6. Deceleration to 0 km/h (0 mph).
7. Engine idling for 2 minutes or until the I/M System Status indicator updates to YES.

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 | Go to Step 4
4 |

1. Refer to the Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to complete this test.
2. Observe the Not Ran Since Code Cleared display with a scan tool.
3. Determine which of the DTCs required for a YES status has not run.
4. Enter the DTC number in the Specific DTC menu of the scan tool.
5. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
6. Repeat the procedure until the scan tool indicates the diagnostic test has run. This may take up to 2 hours.
7. Repeat steps 4-6 for any additional required DTCs that have not run.
8. 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 | System OK