Starter Motor: Description and Operation

CIRCUIT OPERATION
The Power Distribution Center ([1][2]PDC) supplies battery voltage to the engine starter motor solenoid through circuit T40 when the coil side of the engine starter motor relay energizes. Circuit A1 contains a 20 Amp fuse, and feeds the contact side of the engine starter motor relay. Both the 20 Amp fuse and the engine starter motor relay are located in the PDC.

The ignition switch supplies battery voltage to the coil side of the engine starter motor relay on circuit A41 when the key is moved to the START position and the [1][2]PARK/NEUTRAL switch portion of the Manual Valve Lever Position Sensor (MVLPS) is CLOSED. Circuit A41 also provides an ignition start input to the Transmission Control Module (TCM).

Ground for the coil side of the engine starter motor relay is supplied on the T41 circuit when the PARK/ NEUTRAL switch portion of the MVLPS is CLOSED. The MVLPS is case grounded. The T41 circuit is also an input to the Powertrain Control Module (PCM), cavity 76, and the Transmission Control Module (TCM), cavity 41. This input is used to indicate when the vehicle is in the PARK or NEUTRAL position.

Circuit A0 (battery positive cable) supplies battery voltage to the engine starter motor when the solenoid energizes. Ground for the engine starter motor is supplied through the starter motor case.