DTC U0114: F-CAN Malfunction (PCM - AWD Control Unit)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .

DTC (PGM-FI)

• 1. Problem verification:

  - 1. Turn the vehicle to the ON mode.

  - 2. Clear the DTC with the HDS.

  - 3. Check for Pending or Confirmed DTCs with the HDS.

  DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
  U0114 F-CAN Malfunction (PCM - AWD Control Unit)

  Is DTC U0114 indicated?

  YES 

  The failure is duplicated. Go to step 2.

  NO 

  Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the real time AWD control unit and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

• 2. Real Time AWD system check:

  - 1. Check for communication to the real time AWD system with the HDS.

  Does the HDS communicate with the real time AWD system?

  YES 

  Go to step 3.

  NO 

  Go to the symptom troubleshooting for AWD system indicator does not go off, and no DTCs are stored - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability(AWD)Real Time AWD System Symptom Troubleshooting - HDS does not communicate(AWD)Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored(AWD)Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode(AWD)Real Time AWD System Symptom Troubleshooting - Abnormal noise(AWD)Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on(AWD) .

• 3. Open wire check (F-CAN_H line):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

  - 3. Disconnect the following connectors.

  PCM connector A (51P)

  Real time AWD control unit 24P connector

  - 4. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	PCM connector A (51P): disconnected
  	Real time AWD control unit 24P connector: disconnected
  Test point 1	Real time AWD control unit 24P connector No. 14
  Test point 2	PCM connector A (51P) No. 2

  Is there continuity?

  YES 

  The F-CAN_H wire is OK. Go to step 4.

  NO 

  Repair an open in the F-CAN_H wire between the PCM (A2) and the real time AWD control unit.

• 4. Open wire check (F-CAN_L line):

  - 1. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	PCM connector A (51P): disconnected
  	Real time AWD control unit 24P connector: disconnected
  Test point 1	Real time AWD control unit 24P connector No. 24
  Test point 2	PCM connector A (51P) No. 1

  Is there continuity?

  YES 

  The F-CAN_L wire is OK. Update the real time AWD control unit if it does not have the latest software, then recheck. If DTC U0114 is indicated after updated, replace the real time AWD control unit .

  NO 

  Repair an open in the F-CAN_L wire between the PCM (A1) and the real time AWD control unit.