P1594

Tests 1 - 2:

Tests 3 - 7:

Test 8:

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
- BTS
- Generator shorted
- PCM (charging system voltage high)
- PCM (battery temperature sensor)
- PCM (charging system)