Inspection/Maintenance (I/M) Complete System Set Procedure. GMC Truck Envoy XUV 2004

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2004 🢒 Envoy XUV 🢒 Engine 🢒 Engine Controls - 4.2L 🢒 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 diagnostics, and complete the trips for those particular diagnostics. When all diagnostic tests are completed, the I/M System Status indicators are set to YES.

Conditions for Running

Cold Start

•	The barometric pressure (BARO) is more than 74 kPa.

•	The engine coolant temperature (ECT) is below 30°C (86°F).

•	The intake air temperature (IAT) is below 30°C (86°F).

•	The difference between the intake air temperature (IAT) and the engine coolant temperature (ECT) is 8°C (14°F) or less.

•	The battery voltage is between 9-18 volts.

•	The fuel level is between ¼ and ¾.

Diagnostic Aids

Rough road conditions may prevent some of the tests from running. Extreme high or low ambient temperatures may prevent tests such as heated oxygen sensor (HO2S) Heater and evaporative emission (EVAP) System from initiating. If a step is interrupted before completion, perform the remaining portion of the set procedures. Any portion of the set procedure that requires the engine at operating temperature may be repeated. This allows most of the diagnostics to run and the remaining tests can be performed using the individual System Set Procedures.

If the vehicle has recently run, start this procedure at step 3. This will allow the tests that require the engine at operating temperature to run. Using this method allows shorter cool down periods if the tests requiring a cold start do not initiate.

The scan tool can be used to monitor each of the I/M System Status indicators during the I/M Complete System Set Procedure. When all of the indicators for a test step have updated to YES, testing can move on to the next step even if the remaining portion of the test is not complete. For example, step 3 is designed to run the EVAP, secondary air injection (AIR), and HO2S tests. The procedure instructs the technician to operate the vehicle in the enable conditions for 6 minutes. If all 3 tests have updated to YES within 4 minutes, it is not necessary to continue with the enable conditions and testing can advance to the next step.

Step

Action

Value(s)

Yes

Did you perform the Inspection/Maintenance (I/M) System Check?

Go to Step 2

Go to Inspection/Maintenance (I/M) System Check

Important: Whenever the ignition is turned ON, ignition positive voltage is supplied to the 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.

Preprogram the scan tool with the vehicle information before the ignition is turned ON.
Ensure that the vehicle is within the Conditions for Running specified in the supporting text.
Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
Set the vehicle parking brake.
Verify that the transmission is in Park for automatic transmissions and Neutral for manual transmissions.
Start the engine and allow the engine to idle.
Allow the engine to idle for the specified time.

Is the action complete?

2 minutes

Go to Step 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:

Acceleration at part throttle to 90 km/h (56 mph) with this speed maintained until the engine reaches operating temperature. This may be up to 8-10 minutes depending on the start up coolant temperature.
Continued operation under these conditions for an additional 6 minutes.

Is the action complete?

Go to Step 4

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

Vehicle speed reduced to 72 km/h (45 mph) with this speed maintained for one additional minute.
Four decelerations of 25 seconds each from 72 km/h (45 mph) while the following criteria is maintained:

•	The throttle is closed.

•	NO brake application on either manual or automatic transmission

•	NO clutch actuation on a manual transmission

•	NO manual downshift

•	The vehicle speed remains above 40 km/h (25 mph).

•	After each deceleration period, the vehicle is returned to 72 km/h (45 mph) under part throttle acceleration and the speed is maintained for 15 seconds.

Is the action complete?

Go to Step 5

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

Acceleration at part throttle to 75-89 km/h (47-55 mph) with this speed maintained for 2 minutes.
Deceleration to 0 km/h (0 mph).
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 6

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

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 that did not update to YES

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

Does the scan tool indicate any Emission Related DTCs set?

Go to Diagnostic Trouble Code (DTC) List

System OK