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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 156 (Automatic Transaxle, 4T65-E Diagnosis (DTC P0218 To P1819)) >> DTC'S P0218 To P1819 >> DTC P0716 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The automatic transmission input shaft speed (AT ISS) sensor is a permanent magnet with a coil of wire wound around it. The AT ISS sensor mounts in the case cover facing the reluctor wheel of the input shaft. As the reluctor wheel is driven by the turbine shaft, an AC signal is induced in the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage at the sensor.

There is a fixed air gap between the sensor and the teeth on the sensor reluctor wheel. The AT ISS sensor input is used by the PCM in order to control line pressure, TCC apply and release and transmission shift patterns. This sensor is also used to calculate the appropriate gear ratios and TCC slippage.

This diagnostic indicates stuck, erratic, or intermittent conditions in the system.

If the PCM detects an unrealistically large change in the AT ISS sensor high signal in a short period of time, then DTC P0716 sets. DTC P0716 is a type B DTC.

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