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 there is difference between battery voltage at power supply terminal of ECM and ECM commend voltage.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Signal Monitoring |
•
Poor connection
•
Open or short in circuit
•
Faulty charging system
•
Faulty ECM |
Enable Conditions |
•
Engine running state
•
No error related to LIN communication | |
Threshold value |
•
Battery voltage at power supply terminal of ECM – ECM commend voltage > 10V | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
NO MIL ON(DTC only) |
Fig.1) Normal waveforms of COM, FR terminal of alternator at idle.
Fig.2) Normal waveforms of COM, FR terminal of alternator under high electronic load condition
Fig.3) Normal waveforms of COM, FR terminal of alternator at ig on under connector disconnected condition.
Fig.4) Normal waveforms of COM, FR terminal of alternator at idle under connector disconnected condition.
