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 MANUALSCHEVROLET1999W 3500 TILTMASTER L4-4.8L DSL TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINOUT VALUES AND DIAGNOSTIC PARAMETERSTYPICAL SCAN DATA VALUES
1999 Chevrolet W 3500 Tiltmaster L4-4.8L DSL Turbo
Typical Scan Data Values
1999 Chevrolet W 3500 Tiltmaster L4-4.8L DSL TurboSECTION Typical Scan Data Values
TYPICAL SCAN DATA VALUES
Use the Typical Scan Data Values Table only after the On-Board Diagnostic System Check has been completed, no diagnostic trouble codes were noted, and you have determined that the on-board diagnostics are functioning properly. Scan tool values from a properly-running engine may be used for comparison with the engine you are diagnosing. The typical scan data values represent values that would be seen on a normally-running engine.
Note: A scan tool that displays faulty data should not be used, and the problem should be reported to the scan tool manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary replacement of parts.
Only the parameters listed below are referred to for use in diagnosis. For further information on using the scan tool to diagnose the engine control module and related sensors, refer to the applicable reference section listed below. If all values are within the typical range described below, refer to the symptoms section for diagnosis.
Test Conditions
Engine running, lower radiator hose hot, transmission in park or neutral, closed loop, accessaries off, brake not applied and air conditioning off.
Use the Typical Scan Data Values Table only after the On-Board Diagnostic System Check has been completed, no diagnostic trouble codes were noted, and you have determined that the on-board diagnostics are functioning properly. Scan tool values from a properly-running engine may be used for comparison with the engine you are diagnosing. The typical scan data values represent values that would be seen on a normally-running engine.
Note: A scan tool that displays faulty data should not be used, and the problem should be reported to the scan tool manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary replacement of parts.
Only the parameters listed below are referred to for use in diagnosis. For further information on using the scan tool to diagnose the engine control module and related sensors, refer to the applicable reference section listed below. If all values are within the typical range described below, refer to the symptoms section for diagnosis.
Test Conditions
Engine running, lower radiator hose hot, transmission in park or neutral, closed loop, accessaries off, brake not applied and air conditioning off.
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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.