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 MANUALSCHEVROLET2000C TAHOE 2WD V8-4.8L VIN VREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULE (PCM) DESCRIPTIONSYSTEM STATUS AND DRIVE CYCLE FOR INSPECTION/MAINTENANCE
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN V
System Status and Drive Cycle For Inspection/Maintenance
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN VSECTION System Status and Drive Cycle For Inspection/Maintenance
The System Status selection is included in the scan tool System Info menu.
Several states require that the I/M (OBD II system) pass on-board tests for the major diagnostics prior to having a vehicle emission inspection. This is also a requirement to renew license plates in some areas. 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 to comply with local area requirements. Using the System Status display, any of the following systems or combination of systems may be monitored for I/M Readiness:
^ The catalyst
^ The EVAP system
^ The Heated Oxygen Sensors (HO2S)
^ The HO2S heater
^ The EGR system
^ The AIR system
IMPORTANT: The System Status display indicates only whether or not the test has been completed. The System Status display does not necessarily mean that the test has passed. If a Failed Last Test indication is present for a DTC associated with one of the above systems, diagnosis and repair is necessary in order to meet the IIM 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. Refer to the Typical Drive Cycle table, more than one drive cycle may be needed, to use as a guide to complete the I/M System Status tests.
Following a DTC info clear, System Status clears for one or all of these systems. Following a battery disconnect or a PCM replacement, all System Status information clears.
Several states require that the I/M (OBD II system) pass on-board tests for the major diagnostics prior to having a vehicle emission inspection. This is also a requirement to renew license plates in some areas. 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 to comply with local area requirements. Using the System Status display, any of the following systems or combination of systems may be monitored for I/M Readiness:
^ The catalyst
^ The EVAP system
^ The Heated Oxygen Sensors (HO2S)
^ The HO2S heater
^ The EGR system
^ The AIR system
IMPORTANT: The System Status display indicates only whether or not the test has been completed. The System Status display does not necessarily mean that the test has passed. If a Failed Last Test indication is present for a DTC associated with one of the above systems, diagnosis and repair is necessary in order to meet the IIM 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. Refer to the Typical Drive Cycle table, more than one drive cycle may be needed, to use as a guide to complete the I/M System Status tests.
Following a DTC info clear, System Status clears for one or all of these systems. Following a battery disconnect or a PCM replacement, all System Status information clears.
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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.