GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Tracker - 4WD 🢒 Engine 🢒 Engine Controls - 2.5L (LE8) 🢒 Inspection/Maintenance (I/M) Complete System Set Procedure

Description

The purpose of the 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 trips for those particular diagnostics. When all diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform this test when more than one or all of the I/M System Status indicators are set to NO.

Conditions for Running
    • The barometric pressure is more than 75 kPa.
    • The engine coolant temperature (ECT) is at least 70°C (158°F) after engine warm up.
    • The fuel level is between ¼ and ¾.
    • The battery voltage is between 10.5-16 volts.
    • The vehicle has been driven for at least 20 minutes.
    • The test will initiate only after a cold start. The control module considers the engine to be cold if the engine coolant temperature (ECT) is below 2°C (35°F).

Diagnostic Aids

Rough road conditions may prevent some of the tests from running. Extreme high or low ambient temperatures may prevent tests such as heated oxygen sensor (HO2S) heater and evaporative emission (EVAP) system from initiating. If a step is interrupted before completion, perform the remaining portion of the set procedures. Any portion of the set procedure that requires the engine at operating temperature may be repeated. This allows most of the diagnostics to run and the remaining tests can be performed using the individual System Set Procedures.

The scan tool can be used to monitor each of the I/M System Status indicators during the I/M Complete System Set Procedure. When all of the indicators for a test step have updated to YES, testing can move on to the next step even if the remaining portion of the test is not complete. For example, step 3 is designed to run the Catalyst Test. The procedure instructs the technician to operate the vehicle in the enable conditions for 6 minutes. If the test updates to YES within 4 minutes, it is not necessary to continue with the enable conditions and testing can advance to the next step.

Test Description

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

  1. Make sure you 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. This step is to run the HO2S Heater Tests.

    Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria.

    3.

  3. This step is to run the catalyst test. The catalyst test runs during the specified cruise period.

    4.

  4. This step is to run the exhaust gas recirculation (EGR) tests. A steady vehicle speed is required in order to maintain a high, stable signal from the manifold absolute pressure (MAP) sensor.

    5.

  5. This step is to run the oxygen sensor tests.

    6.

  6. This step is to run the EVAP tests.

    7.

  7. The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.

Step

Action

Value(s)

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. Preprogram the scan tool with the vehicle information before the ignition is turned ON.
  2. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  3. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  4. Set the vehicle parking brake.
  5. Verify the transmission is in Park.
  6. Start the engine.
  7. Idle the engine until the engine reaches operating temperature of at least 70°C (158°F). This may be up to 8-10 minutes depending on the start up coolant temperature.

    8. Important: In order for the remaining portion of this test to run, the vehicle must operate in the following conditions:

  8. Acceleration at part throttle to 48-80 km/h (30-50 mph).
  9. Speed maintained for 2 minutes or until the I/M System Status indicator updates to YES

Is the action complete?

--

Go to Step 3

--

3

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.

In order for the next group of tests to run, the vehicle must operate in the following conditions:

  1. Acceleration at part throttle to 72-100 km/h (45-60 mph).
  2. Maintain this speed without changing the throttle position for 2-3 minutes or until the I/M System Status updates to YES.

Is the action complete?

--

Go to Step 4

--

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:

  1. Acceleration at part throttle to 50-65 km/h (30-40 mph).
  2. Maintain this speed without changing the throttle position for 3 minutes.

Is the action complete?

--

Go to Step 5

--

5

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.

In order for the next group of tests to run, the vehicle must operate in the following conditions:

  1. Accelerate the vehicle to within the specified speed.
  2. Operate the vehicle within the specified speed for 3 to 5 minutes or until the I/M System Status updates to YES.

Is the action complete?

80-100 km/h (50-60 mph)

Go to Step 6

--

6

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

  1. Idle the engine until the engine reaches operating temperature of at least 70°C (158°F). This may be up to 8-10 minutes depending on the start up coolant temperature.
  2. Acceleration at part throttle to 56-89 km/h (35-55 mph).
  3. Operate the vehicle for 20 minutes at speeds of 56 km/h (35 mph) or more.
  4. Operate the vehicle for 3 minutes between 48-80 km/h (30-50 mph) with the throttle position steady.
  5. With a scan tool, observe the I/M System Status display.

Is the action complete?

--

Go to Step 7

--

7

With a scan tool, observe the I/M System Status display.

Did all of the I/M System Status indicators update to YES?

--

Go to Step 8

Go to the I/M System Set Procedure for the indicated systems

8

With a scan tool, 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