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 MANUALSCHEVROLET1996FORWARD CONTROL 6.5 Y, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION DIAGNOSIS - 4L80-EDIAGNOSTIC TESTSP0716, INPUT SPEED SENSOR CIRCUIT RANGE/PERFORMANCE MALFUNCTIONDIAGNOSTIC PROCEDURES
1996 Chevrolet Forward Control 6.5 Y, Automatic
Diagnostic Procedures
1996 Chevrolet Forward Control 6.5 Y, AutomaticSECTION Diagnostic Procedures
- Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, record freeze frame and failure records for reference. Data will be lost when DTCs are cleared later in this test.
- Raise and support vehicle. Disconnect input speed sensor connector. Start engine. Read input speed sensor voltage on scan tool. If voltage is more than .5 volt, go to next step. If voltage is less than .5 volt, check for open in input speed sensor low circuit. See WIRING DIAGRAMS . Repair circuit as necessary, then go to step 4.
- Check for open in input speed sensor high and low circuits. See WIRING DIAGRAMS . Repair circuits as necessary, then go to next step. If circuit is okay, using a DVOM, measure across input speed sensor circuits at appropriate PCM connector terminals with engine running. See WIRING DIAGRAMS . If voltage is more than .5 volt, replace PCM, then go to next step. If voltage is less than .5 volt, replace input speed sensor, then go to next step.
- After repair is complete, select DTC on scan tool. Select "Clear Info" function. Select "Specific DTC" and enter DTC "P0716". Start vehicle and place gear selector in Drive. PCM must detect a input speed change of less than 500 RPM for one second. If DTC P0716 is not present, repair is complete. If DTC P0716 is still present, repeat test.
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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.