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Service Information
2003 Chevrolet Chevy K Silverado - 4WD | Sierra, Silverado (VIN C/K) Service Manual | Engine | Engine Controls - 4.8L, 5.3L, and 6.0L | Diagnostic Information and Procedures | Document ID: 1101624
Inspection/Maintenance Evaporative Emission System Set
DescriptionThe purpose of this procedure is to satisfy the enable criteria necessary to execute inspection/maintenance (I/M) readiness diagnostics for the Evaporative Emission (EVAP) System. The procedure may be used to set the EVAP I/M System Status display on the scan tool to YES. The EVAP I/M System Status display indicates whether or not the control module has completed the readiness diagnostics. The readiness diagnostics complete when all DTCs comprising the diagnostics run and pass, or any DTC comprising the diagnostics illuminates the malfunction indicator lamp (MIL). If the diagnostics pass during one drive cycle, seventeen hours must elapse, regardless of whether the vehicle is driven or not. Then, the diagnostics will run again during the next drive cycle in which the conditions for running are met. Once the diagnostics have passed during the third drive cycle, the EVAP I/M System Status display will be updated to YES. A failed or aborted diagnostic will require the vehicle to cool down in order to meet the enable criteria for another drive cycle. Therefore, performing a visual inspection prior to running the EVAP test may prevent having to repeat the drive cycle.
Conditions for Running• At least 17 hours have elapsed since the last drive cycle met the Conditions for Running.• The difference between the startup engine coolant temperature (ECT) and the startup intake air temperature (IAT) is less than 8°C (14.4°F).
• The barometric pressure (BARO) is more than 74 kPa.
• The startup ECT is between 4-30°C (39-86°F).
• The startup IAT is between 4-30°C (39-86°F).
• The fuel level is between 15-85 percent.
• The battery voltage is between 10-18 volts.
• The fuel level does not increase more than 9 percent during this drive cycle.
• The engine run time is at least 10 minutes.
• The vehicle has been driven at least 5 km (3.15 miles) this drive cycle.
• The estimated ambient temperature at the end of this drive cycle is between 2-32°C (36-89°F).
• The shutdown ECT is at least 70°C (158°F).
• The ignition is turned OFF for at least 1 hour after this drive cycle.
Diagnostic AidsExtreme high or low ambient temperatures may prevent the EVAP System Tests from initiating. A loose fuel cap may cause a test to abort or fail and prevent the I/M System Status from updating. A failed or aborted diagnostic will require the vehicle to cool down in order to meet the enable criteria for another drive cycle.
If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the diagnostic does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information. This will give an indication of why the test does not complete. Some diagnostics may abort due to changes in the conditions while the test is running. For example, changes in engine load, such as a cooling fan or an A/C compressor clutch turning ON, may cause the diagnostic to abort.
Step
Action
Yes
No
1
Did you perform the Inspection/Maintenance (I/M) System Check?
Go to Step 2
Go to Inspection/Maintenance (I/M) System Check
2
Important: At least 3 drive cycles, with a minimum of 17 hours between drive cycles, are required for the EVAP System Status to update to YES. Repeat steps 1-9 until the minimum requirement of drive cycles is met.
Important: Once the engine is started, DO NOT turn the engine OFF for the remainder of the procedure.
Caution: Refer to Road Test Caution in the Preface section.
Important: Ensure that the ignition remains OFF for 1 hour in order for the control module to perform vacuum testing.
Did the EVAP System Status update to YES?
Go to Step 5
Go to Step 3
3
Observe the DTC Information with a scan tool.
Does the scan tool indicate any failed DTCs?
Go to Diagnostic Trouble Code (DTC) List
Go to Step 4
4
Did the EVAP System Status update to YES?
Go to Step 5
Go to Diagnostic Aids
5
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
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This code is on 2004 Chevrolet silverado po. 432 what does it mean or affects on this truck?
where dose the transwmission control solenoid go on 1993 chevrolet silverado truck
ow do you find out where the parts are on a 2001 silverado for the emission control system
bore of 2y
Mal function in the emission control system
Trouble code P0446 means:Evaporative emission control system vent control circuit malfunction
Trouble code P0440 means: Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
under the steering wheel column. has a cover on it
I have a 2000 I30 and there is a map/diagram of the emissions control system including the EGR system on the underside of the hood placed there presumably by the manufacturer.
A Chevrolet Silverado that has cruise control problems might be having a problem with the part of the engine that controls speed and fuel intake. One culprit for this problem is the Speed Control Sensor that is located in the transmission. This part can be easily changed because it is more or less a probe that fits into the rear of the transmission.
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