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Home >> Chevrolet >> 2004 >> Tracker RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - 2.5L (LE8) (Troubleshooting & Diagnosis) >> Troubleshooting >> Inspection/Maintenance (I/M) Complete System Set Procedure >> Test Description

Test Description

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

  1. 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. 8:  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.
Inspection/Maintenance (I/M) Complete System Set Procedure

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: Refer to Road Test Caution in Cautions and Notices.
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: Refer to Road Test Caution in Cautions and Notices.
    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: Refer to Road Test Caution in Cautions and Notices.
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
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