Engine Won't Start

If engine cranks abnormally, go to step 6). If engine does not crank, ensure starter turns. If starter does not turn, go to step 2). If starter turns, ensure gear shaft turns. If gear shaft does not turn, check reduction gear, armature and gear shaft for damage and replace as necessary. If gear shaft turns, check pinion clutch for damage and replace as necessary.
If starter does not turn, check fuse and fusible link. Replace as necessary. If fuse and fusible link are okay, check battery for proper charge. Charge as necessary. Check battery terminals for corrosion and looseness. Service as necessary.
If battery charge and terminals are okay, check starter system components and wiring. Repair wiring or replace ignition switch, inhibitor switch or starter relay as necessary.
If starter components and wiring are okay, ensure starter relay movement is heard. If starter relay movement cannot be heard, replace relay. If starter relay movement can be heard, ensure pinion and ring gear mesh properly. If pinion and ring gear do not mesh properly, adjust pinion extension length. See PINION EXTENSION LENGTH ADJUSTMENT in this article.
Check shift lever for defects, return spring for fatigue and pinion for sliding condition. Replace as necessary. If pinion and ring gear mesh properly, remove starter from engine. Check to see if starter turns under load condition. If starter does not turn, disassemble starter and check components. If starter turns, check starter solenoid and replace as necessary.
Check battery charge. Check terminals for looseness and corrosion. Service as necessary. Install known good starter. If engine cranks normally, repair or replace starter. If engine continues to crank abnormally, check engine.
If starter will not stop turning when ignition is turned off, repair or replace ignition switch, starter relay or starter solenoid.