VSA DTC 86-51
DTC 86-51 : F-CAN Bus-Off Malfunction
NOTE:
- Troubleshoot any PGM-FI DTCs first.
- Before you troubleshoot, review the general troubleshooting information - Refer to:
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| 86-51 F-CAN Bus-Off Malfunction |
DTCs (VSA)
- Problem verification
- 1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Turn the vehicle to the OFF (LOCK) mode.
- 4. Turn the vehicle to the ON mode, then wait for a few seconds or more.
- 5. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame 86-51 F-CAN Bus-Off Malfunction Is DTC 86-51 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to:
How to Troubleshoot the VSA System (2014 2015 2016) or
How to Troubleshoot the VSA System (2017 2018 2019 2020) .
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.
- F-CAN B circuit resistance check
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Short the SCS line with the HDS.
- 3. Disconnect the following connector.
PCM connector A (51P) - 4. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected Test point 1 PCM connector A (51P) No. 11 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 12 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Is there about 52-65 - Ω?
YES
Go to step 8.
NO
Go to step 3.
- Shorted wire check (F-CAN B_H line to F-CAN B_L line)
- 1. Disconnect the following connectors.
TCM 58P connector SBW shifter control module 20P connector VSA modulator-control unit 38P connector - 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected TCM 58P connector: disconnected SBW shifter control module 20P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test point 1 PCM connector A (51P) No. 11 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 12 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Is there continuity?
YES
Repair a short in the wires between PCM terminals A11 and A12.
NO
The F-CAN B_H, F-CAN B_L wires are not shorted. Go to step 4.
- Open wire check (F-CAN B_H, F-CAN B_L lines) 1
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected TCM 58P connector: disconnected SBW shifter control module 20P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test circuit 1 Test point 1 VSA modulator-control unit 38P connector No. 31 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 11 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test circuit 2 Test point 1 VSA modulator-control unit 38P connector No. 20 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 12 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Is there continuity?
YES
Go to step 5.
NO
Repair an open in the wire between the VSA modulator-control unit and the PCM.
- Open wire check (F-CAN B_H, F-CAN B_L lines) 2
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected TCM 58P connector: disconnected SBW shifter control module 20P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test circuit 1 Test point 1 VSA modulator-control unit 38P connector No. 31 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 TCM 58P connector No. 7 Test circuit 2 Test point 1 VSA modulator-control unit 38P connector No. 20 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 TCM 58P connector No. 20 Is there continuity?
YES
Go to step 6.
NO
Repair an open in the wire between the VSA modulator-control unit and the TCM.
- Open wire check (F-CAN B_H, F-CAN B_L lines) 3
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected TCM 58P connector: disconnected SBW shifter control module 20P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test circuit 1 Test point 1 VSA modulator-control unit 38P connector No. 31 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 SBW shifter control module 20P connector No. 9 Test circuit 2 Test point 1 VSA modulator-control unit 38P connector No. 20 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 SBW shifter control module 20P connector No. 10 Is there continuity?
YES
The F-CAN B_H, F-CAN B_L wires are OK. Go to step 7.
NO
Repair an open in the wire between the VSA modulator-control unit and the SBW shifter control module.
- VSA modulator-control unit internal resistance check
- 1. Reconnect the following connector.
VSA modulator-control unit 38P connector - 2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected TCM 58P connector: disconnected SBW shifter control module 20P connector: disconnected Test point 1 PCM connector A (51P) No. 11 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 12 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Is there about 108-132 Ω ?
YES
The VSA modulator-control unit is OK. Replace the SBW shifter control module .
NO
- Shorted wire check (F-CAN B_H, F-CAN B_L lines)
- 1. Disconnect the following connectors.
TCM 58P connector SBW shifter control module 20P connector VSA modulator-control unit 38P connector - 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (51P): disconnected TCM 58P connector: disconnected SBW shifter control module 20P connector: disconnected VSA modulator-control unit 38P connector: disconnected Test circuit 1 Test point 1 PCM connector A (51P) No. 11 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Body ground Test circuit 2 Test point 1 PCM connector A (51P) No. 12 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Body ground Is there continuity?
YES
Repair a short to body ground in the wires between the PCM, the TCM, the SBW shifter control module, and the VSA modulator-control unit.
NO
The F-CAN B_H, F-CAN B_L wires are OK. Go to step 9.
- Shorted unit check (TCM)
- 1. Reconnect the following connectors.
PCM connector A (51P) SBW shifter control module 20P connector VSA modulator-control unit 38P connector - 2. Turn the vehicle to the ON mode.
- 3. Clear the DTC with the HDS.
- 4. Turn the vehicle to the OFF (LOCK) mode.
- 5. Turn the vehicle to the ON mode, then wait for a few seconds or more.
- 6. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame 86-51 F-CAN Bus-Off Malfunction Is DTC 86-51 indicated?
YES
Go to step 10.
NO
Update the TCM if it does not have the latest software , or substitute a known-good TCM , then recheck. If DTC 86-51 is not indicated after updating, troubleshooting is completed. If DTC 86-51 is not indicated after substitution, replace the original TCM .
- Shorted unit check (SBW shifter control module)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Reconnect the following connector.
TCM 58P connector - 3. Disconnect the following connector.
SBW shifter control module 20P connector - 4. Turn the vehicle to the ON mode.
- 5. Clear the DTC with the HDS.
- 6. Turn the vehicle to the OFF (LOCK) mode.
- 7. Turn the vehicle to the ON mode, then wait for a few seconds or more.
- 8. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame 86-51 F-CAN Bus-Off Malfunction Is DTC 86-51 indicated?
YES
Go to step 11.
NO
Substitute a known-good SBW shifter control module , then recheck. If DTC 86-51 is not indicated after substitution, replace the original SBW shifter control module .
- Shorted unit check (PCM)
- 1. Reconnect the following connector.
SBW shifter control module 20P connector - 2. Update the PCM if it does not have the latest software,
or substitute a known-good PCM. Refer to:
PCM Removal and Installation (2014 2015) or
PCM Removal and Installation (2016 2017 2018 2019 2020)
- 3. Clear the DTC with the HDS.
- 4. Turn the vehicle to the OFF (LOCK) mode.
- 5. Turn the vehicle to the ON mode, then wait for a few seconds or more.
- 6. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame 86-51 F-CAN Bus-Off Malfunction Is DTC 86-51 indicated?
YES
Go to step 12.
NO
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM - Refer to:
- VSA modulator-control unit check (update)
- 1. Update the VSA modulator-control unit if it does not have the latest software.
- 2. Turn the vehicle to the OFF (LOCK) mode.
- 3. Turn the vehicle to the ON mode, then wait for a few seconds or more.
- 4. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame Is DTC 86-51 indicated?
YES
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit .
NO
Troubleshooting is complete.