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 MANUALSCHEVROLET2004EXPRESS 1500 RWD V6-4.3L VIN XREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONMONITORS, TRIPS, DRIVE CYCLES AND READINESS CODESINSPECTION/MAITENANCE (I/M) COMPLETE SYSTEM SET PROCEDURE
2004 Chevrolet Express 1500 RWD V6-4.3L VIN X
Inspection/Maitenance (I/M) Complete System Set Procedure
2004 Chevrolet Express 1500 RWD V6-4.3L VIN XSECTION Inspection/Maitenance (I/M) Complete System Set Procedure
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. Perform this test when more than one of the I/M System Status indicators are set to NO.
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 15-85 percent.
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step runs the HO2S Heater Tests and initiate the EVAP System Test.Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria.
3. This step runs the EVAP, AIR and the Oxygen Sensor Tests. The EVAP Test begins once the engine coolant reaches a calibrated temperature. The AIR Test, if equipped, begins shortly after Closed Loop and the indicated speed is achieved. The Oxygen Sensor Tests begin once the engine is at operating temperature, in Closed Loop Fuel Control, and a calibrated amount of time has elapsed.
5. This step runs the Catalyst Tests. This test runs during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
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. Perform this test when more than one of the I/M System Status indicators are set to NO.
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 15-85 percent.
TEST DESCRIPTION
Steps 1 - 2:
Step 3:
Step 4:
Steps 5 - 7:
The numbers below refer to the step numbers on the diagnostic table.
2. This step runs the HO2S Heater Tests and initiate the EVAP System Test.Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria.
3. This step runs the EVAP, AIR and the Oxygen Sensor Tests. The EVAP Test begins once the engine coolant reaches a calibrated temperature. The AIR Test, if equipped, begins shortly after Closed Loop and the indicated speed is achieved. The Oxygen Sensor Tests begin once the engine is at operating temperature, in Closed Loop Fuel Control, and a calibrated amount of time has elapsed.
5. This step runs the Catalyst Tests. This test runs during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
RENDER: 1.0x
NO RELATED
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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.