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HOMESERVICE MANUALSCHEVROLET2009MALIBU LS, 3.5 NREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS AND FUEL - 3.5L - TROUBLESHOOTING & DIAGNOSISINSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDUREINSPECTION/MAINTENANCE (I/M) SYSTEM SET PROCEDURE
2009 Chevrolet Malibu LS, 3.5 N

Inspection/Maintenance (I/M) System Set Procedure

2009 Chevrolet Malibu LS, 3.5 NSECTION Inspection/Maintenance (I/M) System Set Procedure
    NOTE: Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Once the engine is started, do NOT turn the engine OFF for the remaining portion of the set procedure.
  1. Ensure that the vehicle meets the conditions for a cold start listed above.
    • If the EVAP I/M System Status indicator displays NO, perform the EVAP Service bay test, if applicable.
    • If the EVAP Service bay test is NOT available, it may take up to 6 drive cycles, with 17 hours between drive cycles for the EVAP I/M System Status Indicator to transition to YES.

      The EVAP I/M System Status indicator requires several drive and 17 hour key OFF cycles to complete before the indicator will transition.

    • If the O2S Heater System Status indicator displays NO, ensure that the ignition has been turned OFF for at least 10 hours.
  2. Turn OFF all accessories, the HVAC system, other electrical loads, including aftermarket/add-on equipment, etc., and open the hood.
  3. Turn the ignition ON with the engine OFF for 1 minute.
  4. Start and idle the engine for 2 minutes, until 65°C (149°F) is achieved.
  5. Run the engine for 6.5 minutes, within the following conditions:
    • MAF parameter between 4-30 g/s
    • Engine speed steady between 1000-3000 RPM
  6. Return the engine to idle for 1 minute.
  7. Apply and hold brake pedal, and shift to Drive for automatic, or apply clutch pedal for manual and operate the vehicle within the following conditions for 2 minutes:
    • Depress the accelerator pedal until TP Sensor angle is more than 2 percent.
    • MAF signal between 15-30 g/s
    • RPM steady between 1200-2000 RPM
    8. NOTE: Do NOT touch the accelerator pedal until told to do so. A change in TP Sensor angle or an increase in engine speed may invalidate this portion of the test.
  8. Release the accelerator pedal and shift the vehicle to Park and allow the engine to idle for 2 minutes.
  9. Quickly depress the accelerator pedal until TP Sensor Angle is more than 8 percent and return to idle; repeat 3 times.
  10. Allow engine to idle for at least 2 minutes.
    11. WARNING: Refer to Road Test Warning .
  11. Close the hood, release the parking brake and drive vehicle at 24 km/h (15 mph) or slower for 2 minutes.
  12. Continue to drive the vehicle for at least 5.5 miles between 45-112 km/h (28-70 mph) with the vehicle reaching at least 80 km/h (50 mph).
  13. Release the accelerator pedal for at least 3 seconds. This will allow the vehicle to enter the decel fuel cut off.
  14. Depress the accelerator pedal until the TP Sensor angle is between 3-20 percent and maintain for 1 minute.
  15. Safely stop the vehicle, with the engine in drive.
    • Allow the vehicle to idle for 2 minutes.
    16. NOTE: Do NOT disturb the vehicle or turn ON the ignition until told to do so. Disturbing the vehicle may invalidate this portion of the test.
  16. Shift the vehicle to park for automatic and neutral for manual. Turn OFF the ignition and exit the vehicle. Do NOT disturb the vehicle for 45 minutes.
  17. Observe the Inspection/Maintenance (I/M) System Status with a scan tool. All of the I/M System Status indicators should display YES.
    • If the EVAP I/M System Status indicator displays NO turn OFF the ignition for 17 hours, ensure that the vehicle meets the conditions for a cold start, and repeat steps 13-18 three more times, or until the EVAP I/M System Status indicator transitions to YES. If the indicator continues to display NO, refer to the Inspection/Maintenance System DTC Table  to identify the DTCs that did not run.
  • If any of the I/M System Status indicators display NO, refer to the Inspection/Maintenance System DTC Table  for the indicator which did not display YES. The I/M System DTC Table identifies the DTCs associated with each I/M System Status Indicator.
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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.