GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Cavalier 🢒 Engine 🢒 Engine Controls - 2.2L (LN2) 🢒 Inspection/Maintenance (I/M) Catalyst System Set Procedure

Description

This test satisfies the enable criteria necessary to execute I/M readiness diagnostics for the catalyst system. The test may be used to set the I/M System Status indicators to YES. Ensure that the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary requirements may produce inaccurate test results.

Conditions for Running
    • The barometric pressure (BARO) is more than 72 kPa.
    • The engine coolant is at operating temperature, 75-125°C (167-257°F).
    • The intake air temperature (IAT) is between -20 to +80°C (-4 to +176°F).
    • The engine is in Closed Loop fuel control.
    • The engine has run for 6-8 minutes off idle in order to initiate test.
    • The battery voltage is 9-16 volts.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.

    2.

  2. The Catalyst Test during the idle period immediately following the cruise period.

    3.

  3. This step identifies a first failure of a type B DTC. A DTC only appears on the I/M System Status display when the DTC becomes a MIL illuminating DTC. This occurs on the second failure of a type B DTC. A first failure of a type B DTC will not allow the I/M System Status to update to YES. Refer to Diagnostic Aids.

    4.

  4. This step identifies any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is located in the service information under Conditions for Running the DTC.

    5.

  5. The I/M System Status only verifies whether a diagnostic has run, not the outcome of the test. If any Emission Related DTC sets after the tests are complete, the DTC will require diagnosis.

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 that the vehicle is within the Conditions for Running specified in the supporting text.
  2. Turn OFF all of the accessories, such as the A/C, blower fan, etc.
  3. Start the engine. Allow the engine to idle.

    4. 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 90 km/h (55 mph) with this speed maintained for 5 minutes.
  5. Deceleration to 0 km/h (0 mph).
  6. Engine idling for 2 minutes while the following criteria is maintained:
    7. • Service brake depressed
    • Automatic transmission in Drive
    • Manual transmission in Neutral with the clutch pedal depressed
  7. Use a scan tool in order to observe the I/M System Status display.

Did the Catalyst System Status update to YES?

Go to Step 5

Go to Step 3

3

Use a scan tool in order to observe the DTC Information.

Does the scan tool indicate any failed DTCs?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 4

4

  1. Refer to Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to complete this test.
  2. Use a scan tool in order to observe the Not Ran Since Code Cleared display.
  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.
  7. Repeat steps 4-6 for any additional required DTCs that have not run.
  8. Use a scan tool in order to observe the I/M System Status display.

Did the Catalyst System Status update to YES?

Go to Step 5

Go to Diagnostic Aids

5

Use a scan tool in order to observe the Emission Related DTC portion of the I/M System Status display.

Does the scan tool indicate any Emission Related DTCs set?

Go to Diagnostic Trouble Code (DTC) List

System OK