Buick Regal: Inspection/Maintenance Complete System Set Procedure

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Description

The purpose of the Inspection/Maintenance Complete System Set Procedure is to satisfy the enable criteria necessary to execute all of the I/M readiness diagnostics and complete the drive cycles for those particular diagnostics. When all I/M monitored diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform the Inspection/Maintenance Complete System Set Procedure if any I/M System Status indicators are set to NO.

Conditions for Meeting a Cold Start

• The ignition voltage between 11 - 18 V.
• The barometric pressure is more than 75 kPa (10.9 psi).
• The start-up engine coolant temperature (ECT) is between 4 - 30ºC (39 - 86ºF).
• The start-up intake air temperature (IAT) is between 4 - 30ºC (39 - 86ºF).
• The difference between the IAT and the ECT is less than or equal to 6ºC (43ºF).
• The ambient air temperature is between 4 - 30ºC (39 - 86ºF).
• The fuel level is between 15 - 85 %.

Circuit/System Verification

1. Verify that all I/M System Status indicators report YES, and that no I/M Test DTCs are present.

• If any I/M Test DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

• Go to next step: If no I/M Test DTCs are set

2. All OK.

Inspection/Maintenance 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 min to allow the sensors to cool before continuing with the test.

When 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.

2. The evaporative emission inspection/maintenance system status indicator should display YES.

• If the inspection/maintenance system status indicator displays NO, perform the Service Bay Test, if applicable. If the Service Bay Test is NOT available, it may take up to 6 drive cycles, with up to 17 h between drive cycles, for the inspection/maintenance system status indicator to transition to YES.

3. The O2S Heater inspection/maintenance system status indicator should display YES.

• If the O2S Heater inspection/maintenance system status indicator displays NO, ensure that the ignition has been turned OFF for at least 10 h.

4. Turn OFF all accessories; HVAC system, other electrical loads, including aftermarket/add-on equipment, etc.

5. Set the vehicle parking brake and ensure the vehicle is in Park for automatic transmission or Neutral for manual transmission.

6. Turn OFF all accessories; HVAC system, other electrical loads, including aftermarket/add-on equipment, etc.

7. Start and idle the engine for at least 2 min and until 65ºC (149ºF) is achieved.

8. Run the engine for 6.5 min within the following conditions:

• MAF parameter between 4 - 30 g/s
• Engine speed steady between 1, 000 - 3, 000 RPM

9. Return the engine to idle for 1 minute.

10. Apply and hold the brake pedal, and shift to Drive for automatic transmission, or apply the clutch pedal for manual transmission and operate the vehicle within the following conditions for 2 min:

• Depress the accelerator pedal until throttle position sensor angle is more than 2 %.
• Mass air flow signal between 15 - 30 g/s
• RPM steady between 1, 200 - 2, 000 RPM

NOTE: DO NOT touch the accelerator pedal during the idle period. A change in throttle position sensor angle or an increase in engine speed may invalidate this portion of the test.

11. Release the accelerator pedal and shift the vehicle to Park for automatic transmission, or Neutral and release the clutch pedal for manual transmission, and allow the engine to idle for 2 min.

12. Quickly depress the accelerator pedal until throttle position sensor angle is more than 8 % and return to idle, repeat 3 times.

13. Allow engine to idle for at least 2 min.

WARNING: Refer to Road Test Warning.

14. Release the parking brake and drive vehicle at 24 km/h (15 mph) or slower for 2 min.

15. Continue to drive the vehicle for at least 5.5 mi between 45 - 112 km/h (28 - 70 mph) with the vehicle reaching at least 80 km/h (50 mph).

16. Release the accelerator pedal for at least 2 s. This will allow the vehicle to enter decel fuel cut-off.

17. Depress the accelerator pedal until the throttle position sensor angle is increased 3 - 20 % and maintain a safe speed for 1 min.

18. Safely stop the vehicle, with the engine in Drive for automatic transmission or in Neutral with the clutch pedal depressed and parking brake applied for manual transmission, idle for 2 min.

19. Shift to Park for automatic and apply the parking brake, or neutral and release clutch pedal for manual.

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.

20. Turn OFF the ignition and exit the vehicle. Do NOT disturb the vehicle for 60 min.

21. Observe the Inspection/Maintenance System Status with a scan tool. All of the Inspection/Maintenance System Status indicators should display YES.

• If the evaporative emission Inspection/Maintenance System Status indicator displays NO, turn OFF the ignition for 17 h, ensure that the vehicle meets the conditions for a cold start, and repeat steps 12 - 18 six more times, or until the evaporative emission Inspection/Maintenance System Status indicator transitions to YES. If the indicator continues to display NO, refer to the Inspection/Maintenance (I/M) System DTC Table to identify the DTCs that did not run. Follow the Conditions for Running the DTC in order to set the evaporative emission Inspection/Maintenance System Status indicator
• If any of the Inspection/Maintenance System Status display NO, refer to the Inspection/Maintenance (I/M) System DTC Table for the indicator which did not display YES. The Inspection/Maintenance System DTC Table identifies the DTCs associated with each Inspection/Maintenance System Status Indicator. Follow the Conditions for Running the DTC in order to set the associated status indicator.

NOTE: An I/M Test DTC will not be stored or erased from the ECU except at the end of trip processing which occurs 5 s after ignition OFF.

22. Observe the I/M Test DTC information with a scan tool. Verify there are no I/M Test DTCs present.

• If an I/M Test DTC is set, diagnose the DTC using the Diagnostic Trouble Code (DTC) List - Vehicle , and refer to Inspection/Maintenance System Check for clearing I/M Test DTCs.
• If an I/M Test DTC is set and the I/M System Status indicators are NO, diagnosis the DTC and perform the Inspection/Maintenance Complete System Set Procedure.

23. Observe the engine DTC information with a scan tool. Verify no DTCs are present.

• If a DTC is set, diagnose using the Diagnostic Trouble Code (DTC) List - Vehicle. After repairs, perform the Inspection/Maintenance Complete System Set Procedure to verify no further DTCs are set.

INSPECTION/MAINTENANCE (I/M) SYSTEM DTC TABLE

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