Circuit/System Description
| Circuit | Description |
|---|---|
| Ignition | Supplied from a relay thru a fuse. |
| Signal | Regulated voltage supplied by the control module. |
| Signal | The control module input circuit has an internal resistance connected to ground. |
| Ground | The output of the switch is connected of chassis ground. |
| Component | Description |
|---|---|
| B15 Transmission Internal Mode Switch | A matrix of ON/Off switches used to control/indicate transmission range. Refer to Electronic Component Description |
| K71 Transmission Control Module | An electronic control module used to control the transmission. Refer to Electronic Component Description |
DTC P0705, P0706
The transmission range switch is a sliding contact switch which is part of the B15 Transmission Internal Mode Switch assembly and is externally mounted on the transmission manual shaft. The transmission range switch is a multi-signal switch. The Ignition Main Relay in the Fuse Block - Underhood supplies ignition voltage to the transmission range switch on a Run/Crank Ignition 1 circuit. The transmission control module provides individual grounds for each of the transmission range position circuits. Each transmission shift lever position grounds one of the switch circuits. In order to determine the gear range selected by the driver, the transmission control module compares the voltage combinations on the signal circuits to a transmission range switch combination look up table stored in the TCM memory. Refer to Transmission Range Switch Logic below.
DTC P0851
The park/neutral position switch is an ON/OFF switch which is part of the B15 Transmission Internal Mode Switch assembly and is externally mounted on the transmission manual shaft. The Engine Control Module supplies ignition voltage to the park/neutral position switch on the Park Neutral Position Switch Park Signal circuit. When in Park or Neutral the B15 Transmission Internal Mode Switch assembly provides a chassis ground for the circuit. This indicates to the engine control module that the transmission is in an acceptable gear to allow engine start up.
For an overview of the component/system, refer to Electronic Component Description