When the ignition switch is turned ON, the current should
be supplied from the combination meter (terminal No. 52) to the alternator (terminal No. 3).
When the engine starts under those conditions, the alternator should generate currents.
The engine-ECU checks the voltage of the battery backup terminal (terminal No. 103)
to monitor the electricity generation voltage of the alternator.
The engine-ECU compares the battery voltage with the
voltage generated from the alternator to check whether the electrical generation is normal.
Ignition switch is “ON” position.
The engine speed is 1 500 r/min or more.
The battery backup voltage is 13.5 V or more.
The G-terminal duty ratio is 10.2 % or more and 89.8 % or less.
For 30 seconds, the final target generation voltage subtracted from the battery
backup voltage equals 0.8 V or more.
For 30 seconds, the battery backup voltage subtracted from the final target
generation voltage equals 1.9 V or more.
Failed drive belt
Loose connector contact
Open/short circuit or harness damage in alternator G-terminal circuit
Harness damage in battery backup circuit
STEP 1. Checking engine start conditions
Check whether the user uses the booster cable to start the engine.
Have you ever used the booster cable to start the engine?