P1689 No Communication Between ECM & Injection Pump Module

SYMPTOM
P-1689 NO COMMUNICATION BETWEEN ECM & INJECTION PUMP MODULE (OBD II)

WHEN MONITORED
Ignition on.

SET CONDITION
Time between CAN messages > 3 seconds or Fuel Injection Pump Module does not receive CAN message.

POSSIBLE CAUSES
- Fuel Inj pump Gnd ckt open or high resistance
- Fuel pump ctrl mod harness observable defect
- Datalink (+) circuit open
- Datalink (+) circuit short to ground
- Datalink (-) circuit open
- Datalink (-) circuit short to ground
- Engine control module defective