Many control units have applied to vehicle as it becomes more eletrolnical. These units control their own system based on information from diverse sensors. Therefore necessity of common use of diverse sensor information and importance of stable power supply are gathering strength. Battery sensor is mounted on battery (-) terminal. It transmits battery voltage, current, temperature information to ECM. ECM controls generating voltage by duty cycle based on these signals.
ECM sets this code when the battery charging current from battery sensor is too low.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Signal Monitoring |
•
Poor connection
•
Open or short in charging system
•
Faulty charging system
•
Faulty ECM |
Enable Conditions |
•
IG "ON"
•
No error related to LIN communication | |
Threshold value |
•
Battery charging current < Calibration
•
State of Charge(SOC) < Calibration | |
Diagnosis Time |
•
60sec | |
MIL On Condition |
•
NO MIL ON(DTC only) |
Fig .1) Normal waveforms of IG, L terminal of alternator during charge warning lamp is ON
Fig .2) Normal waveforms of IG, L terminal of alternator during charge warning lamp is OFF
Fig. 3) Normal waveforms of COM, FR terminal of alternator at idle.
Fig. 4) Normal waveforms of COM, FR terminal of alternator under connector disconnected condition.
