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 MANUALSCHEVROLET1999EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISRESTRAINTS AND SAFETY SYSTEMSAIR BAG SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA LIST
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Scan Tool Data List
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Scan Tool Data List
The scan tool used provides the following capabilities:
^ Read the data list.
^ Read current and history trouble codes.
^ Clear the diagnostic trouble codes after a repair is completed.
Ensure that the scan tool contains the latest diagnostic information before attempting to communicate with the SIR system. In order to use the scan tool, connect the scan tool to the data link connector (DLC) and turn the ignition switch to the RUN position. The scan tool reads serial data sent from the Inflatable Restraint Sensing and Diagnostic Module (SDM) serial data output terminal 5 to the DLC terminal 9.
The SIR Scan Tool Data List contains all Restraint related parameters that are available on the scan tool. The list is arranged in the order as they appear on the scan tool.
Use the SIR Scan Tool Data List only after the following information is determined:
^ The Diagnostic System Check is completed.
^ No Diagnostic Trouble Codes (DTCs) are set.
^ SIR Diagnostics indicates functioning properly Scan tool values from a properly operating system may be used for comparison with the SIR system you are diagnosing. The SIR Scan Tool Data List represents values seen on a properly operating system.
Important: Ensure that the scan tool that you are using is functioning properly. Use of a malfunctioning scan tool may result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to Intermittents and Poor Connections for diagnosis. Intermittents and Poor Connections
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.