DTC U129D
DTC U129D : F-CAN Malfunction (PCM - Precision All Wheel Steer Control Unit)
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| U129D F-CAN Malfunction (PCM - Precision All Wheel Steer Control Unit) |
DTC (PGM-FI)
- CAN gateway system DTC check
-1. Turn the vehicle to the ON mode.
-2. Check for CAN gateway system DTCs with the HDS.
DTC Description DTC U0029-00 CAN Gateway F-CAN ch A Bus Off U0047-00 CAN Gateway F-CAN ch B Bus Off U0056-00 CAN Gateway F-CAN ch C Bus Off U3000-49 CAN Gateway Internal Failure Is DTC U0029-00, U0047-00, U0056-00, and/or U3000-49 indicated?
YES
Go to the troubleshooting for CAN gateway system DTC(s) .
NO
Go to step 2.
- F-CAN circuit communication check
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.
F-CAN Bus Connected Unit Check
Which result is indicated?
PCM (Bus A) is Not Available
Go to step 3.
PCM (Bus B) is Not Available
Go to step 5.
PRECISION ALL WHEEL STEER CONTROL UNIT is Not Available
Go to step 7.
PCM and PRECISION ALL WHEEL STEER CONTROL UNIT are Detected
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the precision all wheel steer control unit, the CAN gateway, and the PCM.
- Open wire check (F-CAN A_H line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Jump the SCS line with the HDS.
-3. Disconnect the following connectors.
CAN gateway 24P connector PCM connector A (51P) -4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected PCM connector A (51P): disconnected Test circuit F-CAN A_H Test point 1 CAN gateway 24P connector No. 14 (BLU) Test point 2 PCM connector A (51P) No. 9 (BLU) Is there continuity?
YES
The F-CAN A_H wire is OK. Go to step 4.
NO
Repair an open in the F-CAN A_H wire between the PCM (A9) and the CAN gateway.
- Open wire check (F-CAN A_L line)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected PCM connector A (51P): disconnected Test circuit F-CAN A_L Test point 1 CAN gateway 24P connector No. 15 (PNK) Test point 2 PCM connector A (51P) No. 10 (PNK) Is there continuity?
YES
The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC U129D goes away and the PCM was updated, troubleshooting is complete. If DTC U129D goes away and the PCM was substituted, replace the original PCM .
NO
Repair an open in the F-CAN A_L wire between the PCM (A10) and the CAN gateway.
- Open wire check (F-CAN B_H line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Jump the SCS line with the HDS.
-3. Disconnect the following connectors.
CAN gateway 24P connector PCM connector A (51P) -4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected PCM connector A (51P): disconnected Test circuit F-CAN B_H Test point 1 CAN gateway 24P connector No. 11 (LT BLU) Test point 2 PCM connector A (51P) No. 11 (LT BLU) Is there continuity?
YES
Go to step 6.
NO
Repair an open in the F-CAN B_H wire between the PCM (A11) and the CAN gateway.
- Open wire check (F-CAN B_L line)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected PCM connector A (51P): disconnected Test circuit F-CAN B_L Test point 1 CAN gateway 24P connector No. 10 (GRY) Test point 2 PCM connector A (51P) No. 12 (GRY) Is there continuity?
YES
The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC U129D goes away and the PCM was updated, troubleshooting is complete. If DTC U129D is not indicated the PCM was substituted, replace the original PCM .
NO
Repair an open in the F-CAN B_L wire between the PCM (A12) and the CAN gateway.
- Open wire check (F-CAN C_H line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
Precision all wheel steer control unit connector A (16P) CAN gateway 24P connector -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Precision all wheel steer control unit connector A (16P): disconnected CAN gateway 24P connector: disconnected Test circuit F-CAN C_H Test point 1 CAN gateway 24P connector No. 9 (PUR) Test point 2 Precision all wheel steer control unit connector A (16P) No. 6 (PUR) Is there continuity?
YES
The F-CAN C_H wire is OK. Go to step 8.
NO
Repair an open in the F-CAN C_H wire between the CAN gateway and the precision all wheel steer control unit.
- Open wire check (F-CAN C_L line)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected Precision all wheel steer control unit connector A (16P): disconnected Test circuit F-CAN C_L Test point 1 CAN gateway 24P connector No. 8 (PNK) Test point 2 Precision all wheel steer control unit connector A (16P) No. 14 (PNK) Is there continuity?
YES
The F-CAN C_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the precision all wheel steer control unit. Update the precision all wheel steer control unit if it does not have the latest software, or substitute a known-good precision all wheel steer control unit , then recheck. If DTC U129D goes away and the precision all wheel steer control unit was updated, troubleshooting is complete. If DTC U129D goes away and the precision all wheel steer control unit was substituted, replace the original precision all wheel steer control unit .
NO
Repair an open in the F-CAN C_L wire between the CAN gateway and the precision all wheel steer control unit.