GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 6.6L (LB7) 🢒 Inspection/Maintenance (I/M) Complete System Set Procedure

Description

The purpose of the I/M Complete System Set Procedure is to satisfy the enable criteria necessary to execute all of the I/M readiness diagnostic tests, and complete the trips for those particular diagnostic tests. When all diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform this test when more than one of the I/M System Status indicators are set to NO.

Conditions for Running

Cold start

    • The engine coolant temperature (ECT) is less than 56°C (133°F).
    • The intake air temperature (IAT) is more than 7°C (20°F).
    • The transmission fluid temperature is between 20-130°C (68-266°F).

Diagnostic Aids

If a step is interrupted before completion, perform the remaining portion of the set procedure. Any portion of the set procedure that requires the engine at operating temperature may be repeated. This will allow most of the diagnostic tests to run and the remaining tests can be performed using the individual system set procedures.

Test Description

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

  1. Ensure that 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 initiates the Component Monitoring Tests.

    3.

  3. The cruise portion of the step runs a portion of the Component Monitoring Tests and to prepare for the remaining tests.

    4.

  4. The acceleration portion of the step completes the Component Monitoring Tests and the idle portion completes the Misfire Monitoring diagnostic tests.

    5.

  5. Perform the individual system test for any of the systems that do not update to YES.

    6.

  6. The I/M System Status only reports on whether or not a diagnostic test has run, not the outcome of the test. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.

Step

Action

Values

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

    Important: Once the engine is started, DO NOT turn the engine OFF for the remaining portion of the set procedure.

  1. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  2. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  3. Set the vehicle parking brake.
  4. Verify the transmission is in Park for automatic transmissions and Neutral for manual transmissions.
  5. Start the engine, and allow the engine to idle.

    6. Important: Do not let the engine idle for more than the specified time. Extended idling may prevent some of the required tests from running.

  6. Allow the engine to idle for the specified time.

Did you complete the action?

2 minutes

Go to Step 3

--

3

Caution: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

In order for the next group of tests to run, the vehicle must operate in the following conditions:

  1. Acceleration at part throttle to 80 km/h (50 mph) with this speed maintained until the engine reaches operating temperature. This may be up to 10 minutes depending on the start up coolant temperature.
  2. Continued operation under these conditions for an additional 3 minutes.

Did you complete the action?

--

Go to Step 4

--

4

Caution: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

In order for the next group of tests to run, the vehicle must operate in the following conditions:

  1. Acceleration at 75 percent throttle until a speed of 110 km/h (68 mph) is attained.
  2. Deceleration to 0 km/h (0 mph).
  3. Engine idling for 2 minutes while the following criteria is maintained:
    4. • Service brake depressed
    • Automatic transmission in Drive
    • Manual transmission in Neutral with the clutch pedal depressed

Did you complete the action?

--

Go to Step 5

--

5

Observe the I/M System Status with a scan tool.

Did all of the I/M System Status indicators update to YES?

--

Go to Step 6

Go to the I/M System Set Procedure for the indicated systems

6

Observe the Emission Related DTC portion of the I/M System Status with a scan tool.

Does the scan tool indicate any Emission Related DTCs set?

--

Go to Diagnostic Trouble Code (DTC) List

System OK