No Response From PCM (PCM SCI Bus)

Test 1 - 3:

Test 4 - 7:

Test 8 - 9:

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

POSSIBLE CAUSES
- Check PCM Powers And Grounds
- PCM SCI Transmit Circuit Shorted To Voltage
- PCM SCI Receive Circuit Shorted To Voltage
- PCM SCI Circuits Shorted Together
- PCM SCI Transmit Circuit Shorted To Ground
- PCM SCI Receive Circuit Shorted To Ground
- PCM SCI Receive Circuit Open
- PCM SCI Transmit Circuit Open
- Powertrain Control Module