P1594

Tests 1 - 3:

Tests 4 - 7:

Test 8:

SYMPTOM
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH

WHEN MONITORED
The engine running. The engine speed greater than 380 RPM.

SET CONDITION
Battery voltage is 1 volt greater than desired system voltage.

POSSIBLE CAUSES
- Target voltage differs from battery voltage
- Battery temperature
- Intermittent condition
- Generator Field driver circuit shorted to ground
- Generator field
- Powertrain Control Module