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DTC P1659

DTC P1659  : ETCS Control Relay OFF Malfunction

NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015), 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) .
DTC Description Confirmed DTC Pending DTC Freeze Frame
P1659 ETCS Control Relay OFF Malfunction      

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
    P1659 ETCS Control Relay OFF Malfunction      

    Is DTC P1659 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 ETCS control relay 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. Determine possible failure area (+B DBW or IG1M/IG1(DBW) line, others)

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

    - 2. Check the following fuse.

    Fuse No. C9 (15 A)
    Location Under-hood fuse/relay box

    Is the fuse OK?

    YES 

    Go to step 3.

    NO 

    Go to step 8.

  3. ETCS control relay test

    -1. Remove the ETCS control relay (A) from the under-hood fuse/relay box.

    GHH319399Courtesy of HONDA, U.S.A., INC.

    - 2. Test the ETCS control relay.

    Is the relay OK?

    YES 

    The ETCS control relay is OK. Go to step 4.

    NO 

    Replace the ETCS control relay.

  4. Determine possible failure area (under-hood fuse/relay box, others)

    -1. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      ETCS control relay: disconnected
    Test circuit IGP
    Test point 1 ETCS control relay 4P socket No. 4
    Test point 2 Body ground
    GHH319400Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 5.

    NO 

    Replace the under-hood fuse/relay box .

  5. Open wire check (+B DBW line)

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

    Test condition Vehicle ON mode
      ETCS control relay: disconnected
    Test circuit +B DBW
    Test point 1 ETCS control relay 4P socket No. 1
    Test point 2 Body ground
    GHH319401Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B DBW wire is OK. Go to step 6.

    NO 

    Repair an open in the +B DBW wire between the No. C9 (15 A) fuse and the ETCS control relay, or replace the under-hood fuse/relay box .

  6. Open wire check (IG1M/IG1(DBW) 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 C (51P) - Refer to: 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 Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015)

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

    Test condition Vehicle OFF (LOCK) mode
      ETCS control relay: disconnected
      PCM connector C (51P): disconnected
    Test circuit IG1M/IG1(DBW)
    Test point 1 ETCS control relay 4P socket No. 2
    Test point 2 PCM connector C (51P) No. 4 (GRN)
    GHH319402Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The IG1M/IG1(DBW) wire is OK. Go to step 7.

    NO 

    Repair an open in the IG1M/IG1(DBW) wire between the PCM (C4) and the ETCS control relay.

  7. Open wire check (DBW RLY line)

    -1. Disconnect the following connector.

    PCM connector A (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or 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)

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

    Test condition Vehicle OFF (LOCK) mode
      ETCS control relay: disconnected
      PCM connector C (51P): disconnected
      PCM connector A (51P): disconnected
    Test circuit DBW RLY
    Test point 1 ETCS control relay 4P socket No. 3
    Test point 2 PCM connector A (51P) No. 13 (WHT)
    GHH319403Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The DBW RLY 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 DBW RLY wire between the PCM (A13) and the ETCS control relay.

  8. Shorted wire check (IG1M/IG1(DBW) line)

    -1. Remove the ETCS control relay (A) from the under-hood fuse/relay box.

    GHH319404Courtesy of HONDA, U.S.A., INC.

    - 2. Jump the SCS line with the HDS.

    - 3. Disconnect the following connector.

    PCM connector C (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or 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)

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

    Test condition Vehicle OFF (LOCK) mode
      ETCS control relay: disconnected
      PCM connector C (51P): disconnected
    Test circuit IG1M/IG1(DBW)
    Test point 1 PCM connector C (51P) No. 4 (GRN)
    Test point 2 Body ground
    GHH319405Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the IG1M/IG1(DBW) wire between the PCM (C4) and the ETCS control relay.

    NO 

    The IG1M/IG1(DBW) wires are OK. Go to step 9.

  9. Determine possible failure area (+B DBW line, PCM)

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

    Test condition Vehicle OFF (LOCK) mode
      ETCS control relay: disconnected
      PCM connector C (51P): disconnected
    Test circuit +B DBW
    Test point 1 ETCS control relay 4P socket No. 1
    Test point 2 Body ground
    GHH319406Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the +B DBW wire between the No. C9 (15 A) fuse and the ETCS control relay, or replace the under-hood fuse/relay box .

    NO 

    The +B DBW 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 (2016), or PCM Removal and Installation (2014 2015) .

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