P1594

Tests 1 - 2:

Tests 3 - 7:

SYMPTOM
P1594 - 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 shorted to ground
- Generator shorted
- Ambient/Battery temperature sensor
- Powertrain control module (generator resistance)
- PCM (battery temperature)
- Powertrain control module (battery voltage)