Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 1993 >> APV >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Tests W/Codes - Transmission) >> Component Check Charts (4L80-E) >> Input Speed Sensor Circuit Check >> Notes

Input Speed Sensor Circuit Check: Notes

WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1993 GMC Yukon, 1993 GMC Vandura Special, 1993 GMC Vandura, 1993 GMC Value Van, and 1993 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.

The input sensor is of the magnetic induction type and is located on the left side of the transmission, forward of center. Serrations in the forward clutch housing induce a small A/C current as they pass by the input sensor. While there is no specific code for an input sensor problem, the PCM/TCM uses input sensor readings to calculate gear ratio, turbine speed and TCC slip, and determine if engine is running.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This test checks the input sensor circuit up to the PCM/TCM.
  2. This test checks the sensor output.
scientia non olet · About Mike's Workshop Manuals