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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTION
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Engine Control Module: Testing and Inspection
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Testing and Inspection
1. Take the following steps in order to set-up for programming the VCM (EEPROM).
^ The battery is fully charged.
^ The ignition is ON.
^ The Data Link Connector (DLC) is secure.
2. Refer to an updated Techline terminal and follow the user's instructions for VCM programming.
3. If the VCM fails to program, do the following functions:
^ Check all the VCM connections.
^ Check the ITCS terminal and equipment for the latest software version.
^ Try again to program the VCM. If the programming fails again, replace the VCM.
4. Perform the Passlock Reprogramming Procedure. Refer to PASSLOCK Reprograming Seed and Key in Theft Deterrent.
5. Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure.
6. For a functional check, perform the Powertrain On-Board Diagnostic (OBD) System Check.
^ The battery is fully charged.
^ The ignition is ON.
^ The Data Link Connector (DLC) is secure.
2. Refer to an updated Techline terminal and follow the user's instructions for VCM programming.
3. If the VCM fails to program, do the following functions:
^ Check all the VCM connections.
^ Check the ITCS terminal and equipment for the latest software version.
^ Try again to program the VCM. If the programming fails again, replace the VCM.
4. Perform the Passlock Reprogramming Procedure. Refer to PASSLOCK Reprograming Seed and Key in Theft Deterrent.
5. Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure.
6. For a functional check, perform the Powertrain On-Board Diagnostic (OBD) System Check.
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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.