3100 HEUI Troubleshooting Vehicle Speed Circuit Test

System Operation

Schematic 1- Single Coil Speed Sensor with ECM Driving Speedometer (Recommended)

Schematic 2- Single Coil Sensor for ECM, Second Single Coil Sensor for Speedometer

Schematic 3- Dual Coil Vehicle Speed Sensor

Schematic 4- Electronic Control Providing Vehicle Speed to Engine ECM

Schematic 5- GM Vehicle Speed Connection Diagram

ECM Pin Locations

Diagnostic Codes

Functional Test

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