Contents Wiring diagrams Section: Starter All sections

Starting System: Overview Pontiac Montana I

Starter 1 illustration ~132 words

DESCRIPTION & OPERATION

WARNINGVehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article in ACCESSORIES & EQUIPMENT.
CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

All models use starter PG260D, serviceable only by complete replacement. When ignition switch is turned to ON or START position, battery voltage is applied to coil side of crank relay and to Powertrain Control Module (PCM) crank signal input. PCM then grounds control circuit of crank relay. When crank relay is energized, it allows voltage to starter solenoid "S" terminal.

When voltage is applied to solenoid windings, this creates movement of solenoid plunger and shift lever, causing drive pinion to engage flywheel and close solenoid switch contacts. (Scheme 1) When solenoid switch contacts close, starter motor energizes and cranks engine. As engine starts, pinion overrun clutch protects armature from excessive speed until ignition switch is opened and plunger return spring disengages pinion.

Scheme 1

Scheme 1
Engine(1) VINStarter
3.4L (LA1)EPG260D
(1) Eighth character of Vehicle Identification Number (VIN).
(1)Eighth character of Vehicle Identification Number (VIN).

STARTER APPLICATION