No Response From PCM (PCM SCI Bus)

Test 1 - 3:

Test 4 - 6:

SYMPTOM
NO RESPONSE FROM PCM (SCI ONLY) - DIESEL ONLY

POSSIBLE CAUSES
- Inspect Wiring Harness And Connectors
- Check PCM powers and grounds
- SCI circuit(s) shorted to ground
- SCI circuit(s) shorted to voltage
- SCI circuit(s) open
- SCI circuit(s) shorted together
- Powertrain control module