General Information

Engine Control
P2501 AMS Voltage Rationality - General Information

Component Location





General Description

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.

DTC Description

ECM shows P2501 when there is a wide voltage difference between battery sensor and actual value.

DTC Detecting Condition





Diagnostic Circuit Diagram