Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSTESTING AND INSPECTIONINSPECTION/MAINTENANCE (I/M) STATUS RESET PROCEDURES
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Inspection/Maintenance (I/M) Status Reset Procedures
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Inspection/Maintenance (I/M) Status Reset Procedures
The scan tool System Into menu includes the System Status selection.
Several states require that the vehicle pass on-board (OBD II system) tests for the major diagnostics prior to having a vehicle I/M emission inspection. Some areas may require that the vehicle pass the OBD II system tests and the I/M emission inspection in order to renew license plates.
Using a scan tool, the technician can observe the System Status (Complete or Not Complete) in order to verify that the vehicle meets the criteria which complies with the local area requirements. Using the System Status display, monitor any of the following systems or a combination of the systems (depending on vehicle make and model) for I/M Readiness:
^ Catalyst
^ Heated Oxygen Sensor (HO2S)
^ Heated Oxygen Sensor (HO2S) Heater Exhaust Gas Recirculation (EGR)
^ Evaporative Emission ([1][2]EVAP)
^ Secondary Air Injection System (AIR)
IMPORTANT: The System Status display indicates only if the VCM has completed the required tests (DTCs). The System Status display does not necessarily mean that the test has passed. If a failure indication is present for a DTC associated with one of the above systems, that test has failed. Diagnosis and repair are necessary in order to meet the I/M requirement. Verify that the vehicle passes all of the diagnostic tests associated with the displayed System Status prior to returning the vehicle to the customer.
Following a DTC Info Clear, battery disconnect, or a control module replacement, all of the System Status information will be set to Not Complete.
Refer to the diagnostic support information associated with each DTC in order to obtain the Conditions for Running the DTC. The vehicle operating conditions that the system must meet in order for a DTC to run are the Conditions for Running the DTC.
The System Status table shows the DTCs that must run in order for the System Status to indicate a system test has been completed.
Typical OBD II Drive Cycle:
Several states require that the vehicle pass on-board (OBD II system) tests for the major diagnostics prior to having a vehicle I/M emission inspection. Some areas may require that the vehicle pass the OBD II system tests and the I/M emission inspection in order to renew license plates.
Using a scan tool, the technician can observe the System Status (Complete or Not Complete) in order to verify that the vehicle meets the criteria which complies with the local area requirements. Using the System Status display, monitor any of the following systems or a combination of the systems (depending on vehicle make and model) for I/M Readiness:
^ Catalyst
^ Heated Oxygen Sensor (HO2S)
^ Heated Oxygen Sensor (HO2S) Heater Exhaust Gas Recirculation (EGR)
^ Evaporative Emission ([1][2]EVAP)
^ Secondary Air Injection System (AIR)
IMPORTANT: The System Status display indicates only if the VCM has completed the required tests (DTCs). The System Status display does not necessarily mean that the test has passed. If a failure indication is present for a DTC associated with one of the above systems, that test has failed. Diagnosis and repair are necessary in order to meet the I/M requirement. Verify that the vehicle passes all of the diagnostic tests associated with the displayed System Status prior to returning the vehicle to the customer.
Following a DTC Info Clear, battery disconnect, or a control module replacement, all of the System Status information will be set to Not Complete.
Refer to the diagnostic support information associated with each DTC in order to obtain the Conditions for Running the DTC. The vehicle operating conditions that the system must meet in order for a DTC to run are the Conditions for Running the DTC.
System Status:
The System Status table shows the DTCs that must run in order for the System Status to indicate a system test has been completed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.