No Response From PCM (SCI Bus) - Powertrain

Tests 1 - 4:

Tests 5 - 7:

SYMPTOM
*NO RESPONSE FROM PCM (SCI ONLY)

POSSIBLE CAUSES
- Check PCM powers and grounds
- Transmission control module
- SCI transmit circuit shorted to ground
- SCI receive circuit shorted to ground
- SCI receive circuit open
- SCI transmit circuit open
- Powertrain Control Module