Note. For circuit identification, see CONNECTOR IDENTIFICATION and/or WIRING DIAGRAMS .
Circuit Description
The Internal Mode Switch (IMS) is a sliding contact switch attached to the selector detent inside the transaxle side cover. The four inputs to the PCM indicate the position of the transaxle range selector. The input voltage level at the PCM is high (battery voltage) when the IMS is open, and low when the switch is closed to ground. The four input parameters represented are Signals "A", "B", "C" and "P" (Parity). See INTERNAL MODE SWITCH LOGIC table.
If the PCM detects a combination of IMS signals that are invalid, or a transitional state (between gear selector positions), while attempting to start the vehicle, then DTC P1819 sets. DTC P1819 is a type "C" DTC.
| Detected Gear | Signal "A" | Signal "B" | Signal "C" | Signal "P" |
|---|---|---|---|---|
| "P" | LOW | HI | HI | LOW |
| "P"/"R" | LOW | LOW | HI | LOW |
| "R" | LOW | LOW | HI | HI |
| "R"/"N" | HI | LOW | HI | HI |
| "N" | HI | LOW | HI | LOW |
| "N"/"D4" | HI | LOW | LOW | LOW |
| "D4" | HI | LOW | LOW | HI |
| "D4"/"D3" | LOW | LOW | LOW | HI |
| "D3" | LOW | LOW | LOW | LOW |
| "D3"/"D2" | LOW | HI | LOW | LOW |
| "D2" | LOW | HI | LOW | HI |
| "D2"/"D1" | HI | HI | LOW | HI |
| "D1" | HI | HI | LOW | LOW |
| Illegal | HI | HI | HI | HI |
| Illegal | LOW | HI | HI | HI |
| Illegal | HI | HI | HI | LOW |
INTERNAL MODE SWITCH LOGIC