P1594

Tests 1 - 4:

Tests 5 - 8:

SYMPTOM
P1594 - CHARGING SYSTEM VOLTAGE TOO HIGH

POSSIBLE CAUSES
- Generator field driver circuit short to ground
- Generator shorted
- PCM defective (charging system)
- PCM battERY temperature not within -12 °C (10 °F) under hood temperature
- PCM voltage & target charging voltage differ by > 1.0 V