Additional Wiring
WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.
The input and output speed sensors use a common ground circuit. The loss of this common ground results in the input signal being sensed for both. After a reset in neutral, and after observing a specific ratio, a Speed Check Fault Counter will increment. Because the speed sensors and the thermistor share the same ground circuit, this DTC may indicate a loss of the common ground. In some cases this fault will cause a Gear Ratio Error DTC to be set.