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 DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLETESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESTRANSMISSION SCAN TOOL DATA VALUES
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Transmission Scan Tool Data Values
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Transmission Scan Tool Data Values
Use the scan tool data values under the [Following conditions:
^ The Powertrain On-Board Diagnostic (OBD) System Check is complete.
^ The on-board diagnostics are functioning properly.
^ No DTCs are present.
The values below represent a typical display recorded from a properly functioning system
Important: Do not use a scan tool that displays faulty data. Report the condition to the scan tool manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.
Only the parameters listed below are used for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis. Scan tool values below were recorded under the following conditions:
^ Engine at idle
^ Upper radiator hose hot
^ Closed throttle
^ Transmission in PARK
^ Closed Loop operation
^ Accessories OFF
^ Brake pedal not applied
Transmission Scan Tool Data Values
^ The Powertrain On-Board Diagnostic (OBD) System Check is complete.
^ The on-board diagnostics are functioning properly.
^ No DTCs are present.
The values below represent a typical display recorded from a properly functioning system
Important: Do not use a scan tool that displays faulty data. Report the condition to the scan tool manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.
Only the parameters listed below are used for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis. Scan tool values below were recorded under the following conditions:
^ Engine at idle
^ Upper radiator hose hot
^ Closed throttle
^ Transmission in PARK
^ Closed Loop operation
^ Accessories OFF
^ Brake pedal not applied
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Transmission Scan Tool Data Values
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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.