Good evening,
I attached the flow chart and possible failure for you for this code. Most of the time it is a bad connection at the ECM.
https://www.2carpros.com/articles/how-to-check-wiring
What kind of scan tool do you have for testing?
Roy
SYMPTOM
P1689-NO COMMUNICATION BETWEEN ECM AND INJECTION PUMP MODULE (OBDII)
WHEN MONITORED
Ignition ON.
SET CONDITION
Time between CAN messages is greater than 3 seconds or Fuel Injection Pump Module does not receive CAN message.
POSSIBLE CAUSES
Wiring and connectors
Fuel injection pump relay output circuit open
Ground circuit open or high resistance
Datalink (+) circuit open
Datalink (+) circuit shorted to ground
Datalink (-) open
Datalink (-) shorted to ground
ECM
Images (Click to make bigger)
SPONSORED LINKS
Wednesday, May 20th, 2020 AT 3:50 PM