Input Speed Sensor Circuit

Fig 1: Input Speed Sensor Circuit Diagram

Courtesy of GENERAL MOTORS CORP.

The input speed sensor, which is a Permanent Magnet (PM) generator, provides PCM/TCM with engine (input) speed information. PM generator, mounted in transmission, produces a pulsing voltage signal whenever engine is running.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step checks input speed sensor circuit to PCM/TCM.
This step checks input speed sensor output.

Fig 2: Input Speed Sensor Diagnostic Flow Chart

Courtesy of GENERAL MOTORS CORP.