U1107-ECU IN SINGLE-WIRE MODE





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    The TIPM detects an open, a short high, a short low or a short together in either of the CAN B Bus circuits.


Possible Causes
  
(D55) CAN B BUS (+) CIRCUIT SHORTED TO GROUND
  
(D54) CAN B BUS (-) CIRCUIT SHORTED TO GROUND
  
(D55) CAN B BUS (+) CIRCUIT SHORTED TO VOLTAGE
  
(D54) CAN B BUS (-) CIRCUIT SHORTED TO VOLTAGE
  
(D55) CAN B BUS (+) CIRCUIT SHORTED TO (D54) CAN B BUS (-) CIRCUIT
  
(D55) CAN B BUS (+) CIRCUIT OPEN
  
(D54) CAN B BUS (-) CIRCUIT OPEN
  
ANY CAN B BUS MODULE
  



Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.








Does the scan tool display this DTC as active?

Yes
  • Go To 2


No
  • The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2.ANY CAN B BUS MODULE— INTERNAL FAULT




NOTE: When performing the above step, turn the ignition off (wait one minute) before disconnecting any module. When the module is disconnected turn the ignition on.


NOTE: This is to determine if the fault is internal within a module.



NOTE: If the DTC becomes stored when a particular CAN B Bus module is disconnected, that module is causing the DTC to set.



With all the CAN B Bus modules disconnected did the TIPM still set this DTC as active?

Yes
  • Go To 3


No

3.(D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE





NOTE: Ensure each CAN B Bus module is disconnected at this time.





Is the voltage above 10.0 volts?

Yes


No
  • Go To 4

4.(D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE



NOTE: Ensure each CAN B Bus module is disconnected at this time.




Is the voltage above 10.0 volts?

Yes


No
  • Go To 5

5.(D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND




NOTE: Ensure each CAN B Bus module is disconnected at this time.




Is the resistance above 1000.0 ohms?

Yes
  • Go To 6


No

6.(D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND



NOTE: Ensure each CAN B Bus module is disconnected at this time.




Is the resistance above 1000.0 ohms?

Yes
  • Go To 7


No

7. (D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT




NOTE: Ensure each CAN B Bus module is disconnected at this time.



Is any resistance present?

Yes


No
  • Go To 8

8. (D55) CAN B BUS (+) CIRCUIT OPEN





Is the resistance above 10.0 ohms?

Yes


No
  • Go To 9

9. (D54) CAN B BUS (-) CIRCUIT OPEN





Is the resistance above 10.0 ohms?

Yes


No