GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Bonneville 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 Inspection/Maintenance Evaporative Emission System Set

Description

The purpose of this procedure is to satisfy the enable criteria necessary to execute an inspection/maintenance (I/M) system monitor for the evaporative emissions (EVAP) system. The system monitor is comprised of the test results from one or more DTCs. This procedure may be used to set the EVAP I/M System Status display on the scan tool to YES. The EVAP I/M System Status display indicates whether or not the control module has completed the system monitor. The system monitor completes when either all DTCs comprising the monitor run and pass, or any DTC comprising the monitor illuminates the malfunction indicator lamp (MIL). If one of the DTCs comprising the monitor is set and the MIL is not illuminated, the necessary trips are required to illuminate the MIL before the monitor will complete. Once the monitor completes, the EVAP I/M System Status display will be updated to YES.

Conditions for Running
    • The barometric pressure (BARO) is more than 74 kPa.
    • The start-up engine coolant temperature (ECT) is less than 30°C (86°F).
    • The intake air temperature (IAT) is between 4-30°C (40-86°F).
    • The difference between the start-up ECT and the IAT is less than 8°C (14.4°F).
    • The fuel level is between ¼-¾.
    • The battery voltage is between 10-18 volts.

Diagnostic Aids

Extreme high or low ambient temperatures may prevent DTCs from initiating. Rough road conditions, a damaged or improperly connected fuel cap, and high fuel volatility may caused DTCs to abort or fail. High fuel volatility usually means that the fuel in the vehicle has a higher volatility than what is appropriate for the ambient temperatures. This can occur when winter fuel is used during warm temperatures. DTCs may also abort due to changes in the conditions while running. For example, changes in engine load, such as a cooling fan or A/C compressor clutch turning ON, may cause a DTC to abort. Failed or aborted DTCs will require the vehicle to cool down in order to meet the conditions for running for another drive cycle. If there is an impending failure, the system may require more time to run than was allotted in the procedure. If any DTCs do not run after numerous attempts and no DTC is set, review the scan tool data list and conditions for funning. This will give an indication of why the DTCs do not complete. If the EVAP I/M System Status does not update to YES, the procedure can be repeated until a YES status is achieved.

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. Select Special Functions with a scan tool.
  2. Determine if the vehicle is equipped with a Service Bay Test for the EVAP System.

Is the vehicle equipped with EVAP Service Bay Test?

Go to Step 3

Go to Step 5

3

  1. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  2. Following the directions on the scan tool, perform the EVAP Service Bay Test.

Did the EVAP System pass the Service Bay Test?

Go to Step 8

Go to Step 4

4

  1. Observe the scan tool Service Bay Test for an indication of why the test did not pass, e.g., failed DTC, test aborted, etc.
  2. Refer to the appropriate service information for diagnosis and repair of the condition as necessary.

Is the repair complete?

Go to Inspection/Maintenance (I/M) Complete System Set Procedure

--

5

    Important: At least 3 drive cycles, meeting the conditions for running, are required for the conditions for running, are required for the EVAP System Status to update to YES. Repeat numbers 1-5 of this step until the minimum amount of drive cycles is met.

  1. Ensure that 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.

    3. Important: Once the engine is started, DO NOT turn the engine OFF for the remainder of the procedure until the procedure is complete.

  3. Start the engine and idle for 2 minutes.

    4. Caution: Refer to Road Test Caution in the Preface section.

    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.
  5. Continue the operating conditions for an additional 11 minutes after the engine reaches operating temperature.

Did the EVAP System Status update to YES?

Go to Step 8

Go to Step 6

6

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 7

7

  1. Refer to Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to update the EVAP I/M System Status to YES.
  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 numbers 4 and 5 of this step for any additional required DTCs that have not run.
  7. Observe the I/M System Status display with a scan tool.

Did the EVAP System Status update to YES?

Go to Step 8

Go to Diagnostic Aids

8

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