Isuzu 4JB1, Service Information

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SERVICE INFORMATION 00 – 3
1. HARD STARTING
1. STARTER INOPERATIVE
Checkpoint Possible cause Correction
Loose battery cable terminal poor
connections due to rusting Clean and/or retighten the battery
cable terminal
Battery discharged or weak
Recharge or replace the battery
Battery
Fan belt loose or broken Adjust or replace the fan belt
Fusible link Fusible link shorted Replace the fusible link
Starter switch Defective starter switch or starter relay Replace the starter switch or the
Starter relay
Defective magnetic switch or starter relay Repair or replace the magnetic switch Starter motor
Defective starter motor Repair or replace the starter motor
2. STARTER MOTOR OPERATES BUT ENGINE DOES NOT TURN OVER
Loose battery cable terminal Clean and/or retighten the battery
cable terminal
Poor connections due to rusting Recharge or replace the battery
Battery discharged or weak Recharge or replace the battery
Battery
Fan belt loose or broken Adjust or replace the fan belt
Defective pinion gear Replace the pinion gear
Defective magnetic switch Repair or replace the magnetic switch
Starter
Brush wear, Weak brush spring Replace the brush and/or the brush
spring
Engine Piston, crank bearing seizure, or other
damage Repair or replace the related parts