P1594

Test 1 - 2:

Test 3 - 5:

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
- Charging system operation
- (K20) generator field control circuit shorted to ground
- Generator field coil shorted to ground
- Battery temperature sensor
- PCM