A/T Gear Position Indicator
A/T Gear Position IndicatorHow the Circuit Works
With the ignition switch in ON (II) or START (III), voltage is applied to the A/T gear position indicator. The transmission range switch provides a ground for each position. As an input is grounded, its indicator comes on. If you select R, for example, ground will be applied to the input of the A/T gear position indicator, and the R indicator will come on.
When the PCM detects an abnormality in the automatic transmission control system, or when you request DTCs (diagnostic trouble codes) through the DLC (data link connector), the PCM will make the D indicator blink.