P2503

Test 1:

Tests 2 - 4:

Tests 5 - 9:

Test 10:

SYMPTOM
P2503-CHARGING SYSTEM VOLTAGE LOW

WHEN MONITORED
The engine running. The engine speed greater than 1157 RPM.

SET CONDITION
The battery sensed voltage is 1 volt below the charging goal for 13.47 seconds. The PCM senses the battery voltage turns OFF the field driver and senses the battery voltage again. If the voltages are the same, the code is set.

POSSIBLE CAUSES
- B+ circuit high resistance
- Generator ground high resistance
- Generator operation
- Intermittent condition
- Generator field ground circuit open
- Generator field control circuit shorted to battery voltage
- Generator field control circuit shorted to ground
- Generator field control circuit open
- PCM