GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 SLS 🢒 Engine 🢒 Engine Controls and Fuel - 4.6L (LH2) 🢒 Inspection/Maintenance (I/M) 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 (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 I/M monitored diagnostic tests are completed, the I/M system status indicators are set to YES. Perform the I/M complete system set procedure if all I/M system status indicators are set to NO.

Conditions for Cold Start
    • The ignition voltage is within 11-18 volts.
    • The Barometric Pressure (BARO) is more than 75 kPa.
    • The start-up Engine Coolant Temperature (ECT) is between 4-30°C (39-86°F).
    • The start-up Intake Air Temperature (IAT) is between 4-30°C (39-86°F).
    • The ECT and IAT values should be within 6°C (10.8°F).
    • The ambient air temperature is within 4-30°C (36-86°F).
    • The fuel tank level is within 15-85 percent.
    • Vehicle has NOT been refueled since the last cold start ignition cycle.

Circuit/System Verification

Review the Inspection/Maintenance (I/M) System Status indicators. All I/M System Status indicators should report YES.

Inspection/Maintenance (I/M) System Set Procedure

Important: Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn the ignition OFF 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.
    2. ⇒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 cycle, 17 hours for EVAP I/M System Status indicator to transfer to YES.
    ⇒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, HVAC system, other electrical loads, including aftermarket add-on equipment, etc., and open the hood.
  3. Apply the parking brake and shift the vehicle in park for automatic, or neutral for manual.
  4. With the engine OFF, turn the ignition ON for 1 minute.
  5. Start and idle the engine for 2 minutes until 65°C (149°F) is reached.
  6. Run the engine for 6.5 minutes under the following conditions:
    7. • MAF parameter within 4-30 g/s
    • Engine speed is between 1,000-3,000 RPM and steady.
  7. Idle the engine for 1 minute.
  8. 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:
    9. • Depress the accelerator pedal until TP Sensor angle is more than 2 percent.
    • MAF parameter within 150-30 g/s
    • RPM is between 1,200-2,000 RPM and steady.

    Important: 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.

  9. Release the accelerator pedal and shift the vehicle to Park for automatic, or Neutral and release clutch pedal for manual, and allow the engine to idle for 2 minutes.
  10. Quickly depress the accelerator pedal until TP Sensor Angle is more than 8 percent and then return to idle, repeat 3 times.
  11. Allow the engine to idle for at least 2 seconds.
  12. Close the hood, release the parking brake and drive vehicle at 24 km/h (15 mph) or slower for 2 minutes.
  13. 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).
  14. Release the accelerator pedal for at least 3 seconds. This will allow the vehicle to enter the decel fuel cut off. Repeat 4 more times.
  15. Depress the accelerator pedal until the TP Sensor angle is within 3-20 percent and maintain for 1 minute.
  16. Safely stop the vehicle, with the engine in drive for automatic or neutral with the clutch pedal depressed and parking brake applied for manual. Allow the vehicle to idle for 2 minutes.
  17. Shift the vehicle to park for automatic and neutral for manual. Turn the ignition OFF and exit the vehicle. Do not operate the vehicle for 45 minutes.
  18. Observe the Inspection/Maintenance (I/M) System Status with a scan tool. All of the I/M System Status indicators should display YES.
    19. ⇒If the EVAP I/M Status indicator displays NO, turn the ignition OFF for 17 hours, ensure that the vehicle meets the conditions for a cold start, and repeat steps 13-8 three or more times, or until the EVAP I/M Status indicator transfers to YES. If the indicator continues to display NO, refer to Inspection/Maintenance (I/M) System DTC Table to identify the DTCs that did not run.
    ⇒If the I/M System Status indicators display NO, the indicator does not to display YES, refer to Inspection/Maintenance (I/M) System DTC Table . The I/M System DTC Table identifies the DTCs associated with each I/M System Status Indicator.