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HOMESERVICE MANUALSCHEVROLET2000C TAHOE 2WD V8-4.8L VIN VREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORTESTING AND INSPECTION
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN V
Vehicle Speed Sensor: Testing and Inspection
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN VSECTION Testing and Inspection
Vehicle Speed Output Circuit Diagnosis
CIRCUIT DESCRIPTION
Various components apply a voltage to the vehicle speed output circuit. The Powertrain Control Module (PCM) creates the vehicle speed output signal by rapidly grounding this circuit via an internal switch called a driver. The driver operates at the same rate as the Vehicle Speed Sensor (VSS) signal input. The various components recognize the voltage being pulled to ground as an indication of vehicle speed.
DIAGNOSTIC AIDS
IMPORTANT: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.
For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Further circuit diagnosis may require I/P removal. Test the circuit from the PCM to the tachometer for being open, shorted to ground or, voltage.
3. This step is testing for the proper signal voltage.
4. This step is testing for an open circuit between the IPC and connector C100.
5. This step is testing for a grounded circuit between the IPC and connector C100.
6. This step is testing for an open circuit between the PCM and connector C100.
7. This step is testing for a grounded circuit between the PCM and connector C100.
Diagnostic Chart (Part 1 Of 2):
Diagnostic Chart (Part 2 Of 2):
Schematic:
CIRCUIT DESCRIPTION
Various components apply a voltage to the vehicle speed output circuit. The Powertrain Control Module (PCM) creates the vehicle speed output signal by rapidly grounding this circuit via an internal switch called a driver. The driver operates at the same rate as the Vehicle Speed Sensor (VSS) signal input. The various components recognize the voltage being pulled to ground as an indication of vehicle speed.
DIAGNOSTIC AIDS
IMPORTANT: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.
For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Further circuit diagnosis may require I/P removal. Test the circuit from the PCM to the tachometer for being open, shorted to ground or, voltage.
3. This step is testing for the proper signal voltage.
4. This step is testing for an open circuit between the IPC and connector C100.
5. This step is testing for a grounded circuit between the IPC and connector C100.
6. This step is testing for an open circuit between the PCM and connector C100.
7. This step is testing for a grounded circuit between the PCM and connector C100.
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.