Description & Operation

WARNING: Vehicles 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.

CAUTION: When 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.

When ignition switch is turned to START position, battery voltage is applied to Park/Neutral Position (PNP) switch. Current passes through PNP switch, then on to starter relay coil only when shift lever is in Park or Neutral. When starter relay is energized, current passes on to starter solenoid "S" terminal. This causes solenoid plunger to move shift lever, which engages pinion with engine flywheel ring gear. Movement of plunger also closes main solenoid contacts, applying battery voltage to starter motor. See Fig 1 .

When engine starts, pinion will overrun, protecting armature from excessive speed and flywheel from damage. When ignition switch is released, plunger return spring disengages pinion. PG starters should not be disassembled, and are serviceable only by complete replacement.

Fig 1: Typical Cranking Circuit Illustration

Courtesy of GENERAL MOTORS CORP.

STARTER APPLICATION

Engine

⁽¹⁾ VIN

Starter

4.3L

PG-260G

5.0L

PG-260M

5.7L

PG-260M

6.5L (Diesel)

28-MT

8.1L

PG-260M

⁽¹⁾	Eighth character of Vehicle Identification Number (VIN).