P1594

Tests 42 - 47:

Tests 48 - 49:

SYMPTOM
P-1594 CHARGING SYSTEM VOLTAGE TOO HIGH

WHEN MONITORED
With the ignition key on and the engine speed greater than 0 RPM.

SET CONDITION
When the PCM regulates the generator field and there are no detected field problems but the voltage output does not decrease.

POSSIBLE CAUSES
- Generator field driver circuit short to ground
- BTS defective
- Generator shorted
- PCM defective (charging system voltage high)
- PCM defective (battery temperature sensor)
- PCM defective (charging system)
- No trouble at this time