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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1345 (ENGINE CONTROL SYSTEM (TROUBLESHOOTING & DIAGNOSIS) -- 1.8L (LNK))TROUBLESHOOTINGINSPECTION/MAINTENANCE (I/M) COMPLETE SYSTEM SET PROCEDURETEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in 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 heated oxygen sensor (HO2S) Heater tests and evaporative emission (EVAP) System tests.
  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 set up the Oxygen Sensor (O2S) tests. These tests run during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
  5. 5:  This step is to run the Oxygen Sensor tests and the EVAP Tests. These tests run during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
  6. 6:  Perform the individual system test for any of the systems that do not update to YES.
  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.
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. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  2. Set the vehicle parking brake.
  3. Verify the transmission is in Park for automatic transmissions and Neutral for manual transmissions.
  4. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
    5. IMPORTANT: Once the engine is started, DO NOT turn OFF the engine for the remainder of the procedure until the test is complete.
  5. Start and idle the engine.
  6. Idle the engine until the engine reaches an operating temperature of at least 70° C (158° F). This may be up to 8-10 minutes depending on the start up coolant temperature.
Is the action complete?		 2 minutes Go to Step 3  -
3 
CAUTION: Refer to Road Test Caution in Cautions and Notices.
    IMPORTANT: In order for the remaining portion of this test to run, the vehicle must operate in the following conditions:
  1. Acceleration at part throttle to 56-90 km/h (45-55 mph).
  2. Speed maintained for 4 minutes or until the I/M System Status indicator updates to YES
Is the action complete?		 - Go to Step 4  -
4 
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. Deceleration to 0 km/h (0 mph).
  2. Engine idling for 2 minutes while the following criteria is maintained:
    • Service brake depressed
    • Automatic transmission in drive
    • Manual transmission in neutral with the clutch pedal depressed
Is the action complete?		 - Go to Step 5  -
5 
CAUTION: Refer to Road Test Caution in Cautions and Notices.
    IMPORTANT: In order for the remaining portion of this test to run, the vehicle must operate in the following conditions:
  1. Acceleration at part throttle to 56-90 km/h (45-55 mph).
  2. Speed maintained for 4 minutes or until the I/M System Status indicator updates to YES
Is the action complete?		 - Go to Step 6  -
6  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 7  Go to the I/M System Set Procedure for the indicated systems
7  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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.