DTC U0101-00: Lost Communication With the PCM (PGM-FI system) (SRS Unit) (2014-15)
NOTE:
- Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components of the correct part number and were properly installed. Refer to: SRS Component Replacement/Inspection After Deployment
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and 12 Volt Battery Terminal Disconnection and Reconnection .
- Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software , and retest.
| DTC Description | DTC |
|---|---|
| U0101-00 Lost communication with the PCM (PGM-FI system) |
DTC (SRS)
- CAN gateway DTC check
-1. Turn the vehicle to the ON mode.
- 2. Check for CAN gateway DTC 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 DTC (CAN gateway)
Is DTC U0029-00, U0047-00, U0056-00, and/or U3000-49 indicated?
YES
Go to the indicated DTC's troubleshooting.
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.
Which result is detected?
PCM (Bus A) is Not Available
Go to step 3.
PCM (Bus B) is Not Available
Go to step 4.
SRS unit (Bus C) is Not Available
Go to step 5.
PCM and SRS unit are Detect
Intermittent failure, the system is OK at this time.
- Open wire check (F-CAN A_L, F-CAN A_H lines)
-1. Jump the SCS line with the HDS.
- 2. Turn the vehicle to the OFF (LOCK) mode.
- 3. Disconnect the following connectors:
CAN gateway 24P connector - Refer to: CAN Gateway Removal and Installation (2014-15) PCM connector A (51P) - Refer to: PCM Removal and Installation (2014-15) - 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_L Test point 1 CAN gateway 24P connector No. 15 (RED) Test point 2 PCM connector A (51P) No. 4 (RED) Test circuit F-CAN A_H Test point 1 CAN gateway 24P connector No. 14 (WHT) Test point 2 PCM connector A (51P) No. 3 (WHT) Is there continuity?
YES
The F-CAN A_L and F-CAN A_H wires are OK. Check for poor connections or loose terminals at the CAN gateway and the PCM, and recheck. If the DTC is still indicated, replace the PCM - Refer to: PCM Removal and Installation (2014-15) .
NO
Repair an open in F-CAN A_L or F-CAN A_H wire between the CAN gateway and the PCM.
- Open wire check (F-CAN B_L, F-CAN B_H lines)
-1. Jump the SCS line with the HDS.
- 2. Turn the vehicle to the OFF (LOCK) mode.
- 3. Disconnect the following connectors:
CAN gateway 24P connector - Refer to: CAN Gateway Removal and Installation (2014-15) PCM connector A (51P) - Refer to: PCM Removal and Installation (2014-15) - 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_L Test point 1 CAN gateway 24P connector No. 10 (LT GRN) Test point 2 PCM connector A (51P) No. 6 (LT GRN) Test circuit F-CAN B_H Test point 1 CAN gateway 24P connector No. 11 (GRN) Test point 2 PCM connector A (51P) No. 5 (LT BLU) Is there continuity?
YES
The F-CAN B_L and F-CAN B_H wires are OK. Check for poor connections or loose terminals at the CAN gateway and the PCM, and recheck. If the DTC is still indicated, replace the PCM - Refer to: PCM Removal and Installation (2014-15) .
NO
Repair an open in F-CAN B_L or F-CAN B_H wire between the CAN gateway and the PCM.
- Open wire check (F-CAN C_L, F-CAN C_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
- 3. Disconnect the following connectors:
CAN gateway 24P connector - Refer to: CAN Gateway Removal and Installation (2014-15) SRS unit connector A (39P) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected SRS unit connector A (39P): disconnected Test circuit F-CAN C_L Test point 1 CAN gateway 24P connector No. 8 Test point 2 SRS unit connector A (39P) No. 21 Test circuit F-CAN C_H Test point 1 CAN gateway 24P connector No. 9 Test point 2 SRS unit connector A (39P) No. 20 Is there continuity?
YES
The F-CAN C_L and F-CAN C_H wires are OK. Check for poor connections or loose terminals at the CAN gateway and the SRS unit, and recheck. If the DTC U0101-00 is still indicated, replace the SRS unit .
NO
Repair an open in F-CAN C_L or F-CAN C_H wire between the CAN gateway and the SRS unit.