P0622 Generator Field Not Switching Properly

Tests 1 - 5:

Tests 6 - 8:

SYMPTOM
P-0622 GENERATOR FIELD NOT SWITCHING PROPERLY

WHEN MONITORED
With the ignition key on and the engine running.

SET CONDITION
When the PCM tries to regulate the generator field with no result during monitoring.

POSSIBLE CAUSES
- Generator field resistance >= 5.0 ohms
- Generator field driver circuit open
- Generator field driver circuit shorted to ground
- Generator field wiring harness intermittent defect
- Generator field wiring harness observable defect
- Powertrain control module defective
- Generator field source (+) circuit open