Isuzu AA-6HK1T Workshop Manual page 30

1. Hard starting
Condition
Starter motor does not turn over
Starter motor operates but
engine does not turn over
Engine turns over but does not
start
Troubleshooting
Possible Cause
Loose battery cable terminals
Poor battery connections due to rusting
Battery discharged or weak
Fusible link shorted
Defective starter switch or starter relay
Defective magnetic switch of starter
motor or starter relay
Defective starter motor
Loose battery cable terminals
Poor battery connections due to rusting
Battery discharged or weak
Loose fan belt
Defective starter motor pinion gear
Defective magnetic switch of the starter
motor
Worn starter motor
Weak brush spring
Piston,crank bearing seizure,or other
damage
Air in the fuel system
Defective engine stop mechanism
Control wire improperly adjusted
Fuel tank is empty
Clogged or damaged fuel lines
Loose fuel line connections
Clogged fuel filter element
Fuel feed pump strainer is clogged
Defective feed pump
Poor return of the engine stop button
Use of the wrong fuel
Water particles in the fuel
Air in the injection pump
Injection nozzle sticking
Injection nozzle starting pressure too low
Improper spray condition
Improper injection pump control rack
operation
Injection pump plunger worn or stuck
Injection pump camshaft seizure or
other damage
GENERAL INFORMATION
Correction
Clean and/or retighten the battery cable
terminals
Recharge or replace the battery
Replace the fusible link
Replace the starter switch or starter relay
Repair or replace the magnetic switch
or starter relay
Repair or replace the starter motor
Clean and/or retighten the battery cable
terminals
Recharge or replace the battery
Adjust the fan belt tension
Replace pinion gear
Repair or replace the magnetic switch
Replace the brush and /or brush spring
Repair or replace the related parts
Bleed air from the fuel system
Replace the engine stop mechanism
Adjust the control wire
Fill the fuel tank
Repair or replace the fuel lines
Retighten the fuel line connections
Replace the fuel filter element or cartridge
Clean the fuel pump strainer
Repair or replace the feed pump
Completely return the engine stop button
Use the recommended fuel
Change fuel
Bleed air from the fuel system
Replace the injection nozzle
Adjust or replace the injection nozzle
Repair or replace the injection pump
control rack
Replace the injection pump plunger
assembly
Replace the injection pump camshaft
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