9-7X V8-5.3L (2005)
DTC P0717, Input Speed Sensor Circuit Low Voltage, is designed to detect a low signal voltage from the ISS. If the PCM or TCM determines that the
input speed is less than 100 rpm with the engine running, DTC P0717 will set.
Both DTC P0716 and P0717 are type B diagnostics which will illuminate the malfunction indicator light (MIL) upon completion of two consecutive trips
with the failure present. Once the DTC sets, it will force a default action designed to protect the transmission.
ISS Testing
Because the ISS assembly is internal to the transmission, it is important that the ISS be thoroughly evaluated before removing it. Common problems such
as poor terminal connection, worn wiring, or opens and shorts all need to be considered before transmission removal. The input speed sensor may be
tested several ways, by substituting the ISS with a signal generator, common test light and circuit resistance. Due to the ISS circuitry design with its
internal IC chip, it is not beneficial to measure the internal resistance. The scan tool is a useful tool to verify the component operation by doing rpm
comparison readings.
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