G643(E) Service Manual Chapter 4. Engine Electrical System 138
Troubleshooting
Starting system problem can be classified into “Start
motor is not operating”, “Start motor is operating but
engine is not starting” , and “There is a lot of time
taken to start engine”.
When the starting system has problems, before
removing the start motor, find where the problem
happens. Generally if it is difficult to start, there are
problems in ignition system, fuel system, and
electrical system. In this case, necessarily inspect
and repair step by step, or the same problem will
happen.
Symptom Possible cause Remedy
Low battery charging voltage Charge or replace
Loose, corroded or worn battery cable Repair or replace
Inhibitor switch fault Adjust or replace
Circuit breaker cut off Reset or replace
Start motor fault Repair
Impossible cranking
Ignition switch fault Replace
Low battery charging voltage Charge or replace
Loose, corroded or worn battery cable Repair or replace
Slow cranking
Start motor fault Repair
Start motor fault Repair
Ignition switch fault Replace
Continuous rotating of start
motor
Start relay fault Replace
Short circuit of wiring Repair
Worn or broken pinion gear tooth or motor fault Repair
Start motor is rotating but
engine is not cranking
Worn or broken ring gear tooth
Replace flywheel ring gear
or torque converter
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