General Information

Engine Control
P2503 AMP No Battery Charge - General Information

Component Location





General Description

Battery sensor is mounted on the battery (-) terminal. It transmits battery voltage, current, temperature information to PCM. PCM controls the generating output by changing the duty cycle to the generator based on these signals.

DTC Description

PCM sets this code when the battery charging current from battery sensor is too low.

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal Waveform & Data








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