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CHAPTER 6. TROUBLESHOOTING
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Troubleshooting
(When a overcurrent flows:)
1. When the ON current is abnormally large:
If an excessively large ON current flows when the diag is started
normally (the OFF current is normal), the booster system power ele-
ment may be detective or a short-circuit may be in the wiring.
If both the ON current and the OFF current are abnormal, the SV
system power related element may be defective or a short-circuit may
be in the wiring.
The +5V system current can be measured with the total of the cur-
rents flowing through R28 and R64.
2. When the OFF current is abnormally large:
Under the OFF state, the power supply terminal may be defective, or
a shatt-circuit may be in the +5V system power wiring. Or the power
line is alive even the power switch is tumed off.
(Especially be careful to the power system controlled by the DC ON.)
Under the OFF state, all the power supplies except for the +5V OC
are normally cut off. So check the power source which is on.
3. When the backup current is abnormally large:
A large OFF current may cause a large backup current. Therefore,
first check for the cause of the large OFF current.
When measuring the OFF current, a current is supplied from the main
battery, and the backup current is supplied from the backup battery.
The circuit operations are the same as the case of the OFF current
measurement.
Note: This circuit operation is based on the third trial model.
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