U1121-LOST COMMUNICATION WITH LIN ECU 1





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    LIN 1 Bus Performance.


Possible Causes
  
(D500) LIN BUS CIRCUIT OPEN
  
(D500) LIN BUS CIRCUIT SHORT TO GROUND
  
ELECTRONIC OVERHEAD MODULE
  
CLUSTER
  



Diagnostic Test

1.CHECK FOR AN ACTIVE DTC






Is the DTC active?

Yes
  • Go To 2


No
  • The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  • Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2.CHECK VOLTAGE AT ELECTRONIC OVERHEAD MODULE








Is the voltage above 10 volts?

Yes
  • Go To 3


No

3.CHECK GROUND CIRCUIT






Is the resistance above 10K ohms?

Yes


No
  • Go To4

4.CHECK LIN BUS CIRCUIT FOR AN OPEN






Is the resistance below 10K ohms?

Yes


No