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DTC P16E5 (2016 With Auto Idle Stop System)

DTC P16E5  : LIN Communication Error (PCM-DC-DC Converter)

NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the A/T System (2014 2015) .
DTC Description Confirmed DTC Pending DTC Freeze Frame
P16E5 LIN Communication Error (PCM-DC-DC Converter)      

DTC (PGM-FI)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    - 2. Clear the DTC with the HDS, and wait 10 seconds.

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

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P16E5 LIN Communication Error (PCM-DC-DC Converter)      

    DTC (PGM-FI)

    Is DTC P16E5 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 DC-DC converter 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. DTC check

    -1. Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P16E2 PGM-FI-ACG LIN Communication Error      

    DTC (PGM-FI)

    Is DTC P16E2 indicated?

    YES 

    Go to step 3.

    NO 

    Go to step 7.

  3. Determine possible failure area (LIN/LIN(ACG) line shorted, others)

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

    - 2. Disconnect the following connector.

    DC-DC converter connector A (3P)

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

    Test condition Vehicle OFF (LOCK) mode
      DC-DC converter connector A (3P): disconnected
    Test point 1 DC-DC converter connector A (3P) No. 1
    Test point 2 Body ground
    GHH319435Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 4.

    NO 

    Go to step 5.

  4. Shorted wire check (LIN/LIN(ACG) line)

    -1. Jump the SCS line with the HDS.

    - 2. Continue to check for continuity between DC-DC converter connector A (3P) terminal No. 1 and body ground, while disconnecting these connectors, one at a time:

    • PCM connector B (51P)
    • Alternator 1P connector
    • Battery fan motor 3P connector

    Does continuity go away when one of the above connectors is disconnected?

    YES 

    The LIN/LIN(ACG) wire is OK. Replace the part that caused an open when it was disconnected. If these parts are OK, replace the DC-DC converter .

    NO 

    Repair a short in the LIN/LIN(ACG) wire between the PCM (B50), the alternator, the battery fan motor, and the DC-DC converter.

  5. Determine possible failure area (DC-DC converter, others)

    -1. Reconnect DC-DC converter connector A (3P).

    - 2. Disconnect the following connector.

    Alternator 1P connector

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

    Test condition Vehicle OFF (LOCK) mode
      Alternator 1P connector: disconnected
    Test point 1 Alternator 1P connector No. 1
    Test point 2 Body ground
    GHH319436Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Replace the DC-DC converter .

    NO 

    Go to step 6.

  6. Open wire check (LIN/LIN(ACG) line)

    -1. Jump the SCS line with the HDS.

    - 2. Disconnect the following connectors.

    PCM connector B (51P)
    DC-DC converter connector A (3P)

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

    Test condition Vehicle OFF (LOCK) mode
    Alternator 1P connector: disconnected
    PCM connector B (51P): disconnected
    DC-DC converter connector A (3P): disconnected
    Test point 1 DC-DC converter connector A (3P) No. 1
    Test point 2 PCM connector B (51P) No. 50 - 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)
    GHH319437Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The LIN/LIN(ACG) wire is OK. 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) .

    NO 

    Repair an open in the LIN/LIN(ACG) wire between the PCM (B50) and the DC-DC converter.

  7. Fuse check

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

    - 2. Check the following fuse.

    Fuse No. D24 (7.5 A)
    Location Driver's under-dash fuse/relay box

    Is the fuse OK?

    YES 

    Go to step 8.

    NO 

    Repair a short in the IG1 ACG wire between the DC-DC converter and the No. D24 (7.5 A) fuse. Also replace the No. D24 (7.5 A) fuse.

  8. Open wire check (IG1 ACG line)

    -1. Disconnect the following connector.

    DC-DC converter connector A (3P)

    - 2. Turn the vehicle to the ON mode.

    - 3. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      DC-DC converter connector A (3P): disconnected
    Test point 1 DC-DC converter connector A (3P) No. 3
    Test point 2 Body ground
    GHH319438Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 9.

    NO 

    Repair an open in the IG1 ACG wire between the DC-DC converter and the No. D24 (7.5 A) fuse in the driver's under-dash fuse/relay box.

  9. Open wire check (LIN/LIN(ACG) line)

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

    - 2. Jump the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector B (51P)

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

    Test condition Vehicle OFF (LOCK) mode
    DC-DC converter connector A (3P): disconnected
    PCM connector B (51P): disconnected
    Test point 1 DC-DC converter connector A (3P) No. 1
    Test point 2 PCM connector B (51P) No. 50 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016)
    GHH319439Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The LIN/LIN(ACG) wire is OK. Replace the DC-DC converter .

    NO 

    Repair an open in the LIN/LIN(ACG) wire between the PCM (B50) and the DC-DC converter.

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