Description
The purpose of the I/M Complete System Set Procedure is to satisfy the enable criteria that are necessary in order to execute all of the I/M readiness diagnostics, and to complete the trips for those particular diagnostics. When all diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform this test when more than one or all of the I/M System Status indicators are set to NO.
Conditions for Running
Cold Start
| • | The barometric pressure 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 IAT and the 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 HO2S heater and 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. The remaining tests can be performed using the individual System Set Procedures.
If the vehicle has recently run, start this procedure at step 3 in order to allow the tests that require the engine at operating temperature in order 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 test, the AIR test , and the 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, you do not need to continue with the enable conditions. Testing can advance to the next step.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Before you perform this test, you must perform the I/M System Check. Failure to do so may result in difficulty updating the status to YES.
-
This step is to run the HO2S heater tests and initiates the EVAP system test.
Preprogramming the scan tool will reduce the amount of time that the oxygen sensor heaters operate while verifying the enable criteria.
The engine control module considers the engine to be cold if the following conditions are met:
-
This step is to run the evaporative emission (EVAP) test, the secondary air injection (AIR) test, and the Oxygen Sensor Test. The EVAP Test begins when the engine coolant reaches a calibrated temperature. If the vehicle is equipped with this equipment, the AIR Test begins after Closed Loop, and after the indicated speed is achieved. The oxygen sensor tests begin when the engine reaches the operating temperature, in Closed Loop Fuel Control, and when a calibrated amount of time has elapsed.
-
This step is to run the Catalyst Tests. This test runs during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
-
Perform the individual system test for any of the systems that do not update to YES.
-
The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emissions-related DTC sets after the tests are complete, the DTC will require diagnosis.
| • | The ECT is less than 30°C (86°F). |
| • | The ECT and the IAT are within 8°C (14°F) of each other during start-up. |
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Did you perform the Inspection/Maintenance (I/M) System Check? | -- | Go to Step 2 | ||||||||
Important: When 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 in order to allow the sensors to cool before continuing with the test. Once the engine is started, DO NOT turn OFF the engine for the remaining portion of the set procedure. 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:
Is the action complete? | -- | Go to Step 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:
Is the action complete? | -- | Go to Step 5 | -- | |||||||
With a scan tool, observe the I/M System Status display. 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 | |||||||
With a scan tool, observe the Emission Related DTC portion of the I/M System Status display. Does the scan tool that indicate any emissions- related DTCs set? | -- | System OK |
