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DLC Circuit Troubleshooting

NOTE:
  • If you suspect the HDS or the HDS DLC cable may be the source of the communication problem, verify that they are working properly by connecting them to a known-good, like vehicle and system, and checking for communication problems.
  • If the CAN line between the PCM and battery condition monitor module A does not works properly, the radiator fun cannot be controlled and the radiator fun rotates at maximum speed.
  1. PGM-FI system communication check

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

    -2. Connect the HDS to the DLC.

    -3. Turn the vehicle to the ON mode, and read the HDS.

    NOTE: If the HDS cannot identify the vehicle through the PGM-FI system, the HDS indicates this message: HDS has been unable to confirm connection to the vehicle.

    Does the HDS identify the vehicle?

    YES 

    Go to step 2.

    NO 

    Go to the DLC circuit troubleshooting for PGM-FI system .

  2. Fuse check 1

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

    -2. Check the following fuse.

    Fuse No. B9

    Is the fuse OK?

    YES 

    Go to step 3.

    NO 

    Replace the No. B9 fuse. Also check for a short to ground on the No. B9 fuse circuit if needed.

  3. Fuse check 2

    -1. Check the following fuse.

    Fuse No. E3

    Is the fuse OK?

    YES 

    Go to step 4.

    NO 

    Replace the No. E3 fuse. Also check for a short to ground on the No. E3 fuse circuit if needed.

  4. Open wire check (+B VBU line)

    -1. Do the 12 volt battery terminal disconnection procedure .

    -2. Remove the service plug .

    -3. Disconnect the following connector.

    IPU 33P connector

    -4. Install the service plug .

    -5. Do the 12 volt battery terminal reconnection procedure .

    -6. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      IPU 33P connector: disconnected
    Test point 1 IPU 33P connector No. 23 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    Go to step 5.

    NO 

    Repair an open in the +B VBU wire between the No. B9 fuse and the IPU.

  5. Open wire check (IG1 EPP line)

    -1. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      IPU 33P connector: disconnected
    Test point 1 IPU 33P connector No. 24 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    Go to step 6.

    NO 

    Repair an open in the IG1 EPP wire between the No. E3 fuse and the IPU.

  6. Determine possible failure area (IGA relay circuit, others)

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

    -2. Connect terminals A and B with a jumper wire.

    Terminal A IPU 33P connector No. 28 
    Terminal B Body ground

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    IPU 33P connector No. 28 and body ground: jumped
    Test point 1 IPU 33P connector No. 25 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    Go to step 7.

    NO 

    Go to step 19.

  7. Determine possible failure area (IGB relay circuit, others)

    -1. Remove the jumper wire.

    -2. Connect terminals A and B with a jumper wire.

    Terminal A IPU 33P connector No. 22 
    Terminal B Body ground

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    IPU 33P connector No. 22 and body ground: jumped
    Test point 1 IPU 33P connector No. 33 
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    Go to step 8.

    NO 

    Go to step 22.

  8. Open wire check (F-CAN A_H line, F-CAN A_L line) 1

    -1. Remove the jumper wire.

    -2. Disconnect the following connectors.

    CAN gateway 16P connector

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 3:
    Test point 2 IPU 33P connector No. 26 
    Test point 1 CAN gateway 16P connector (female terminals) No. 11:
    Test point 2 IPU 33P connector No. 27 
    GHH416247Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 9.

    NO 

    Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the CAN gateway and the IPU.

  9. Shorted wire check (F-CAN A_H line, F-CAN A_L line) 1

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Test point 1 IPU 33P connector No. 26 
    Test point 2 Body ground
    Test point 1 IPU 33P connector No. 27 
    Test point 2 Body ground

    Is there continuity?

    YES 

    Repair a short in the F-CAN A_H wire or the F-CAN A_L wire between the CAN gateway and the IPU.

    NO 

    Go to step 10.

  10. Open wire check (VBU line)

    -1. Do the 12 volt battery terminal disconnection procedure .

    -2. Remove the service plug .

    -3. Remove the IPU .

    -4. Remove the IPU cover .

    -5. Disconnect the following connector.

    Battery condition monitor module A connector F (20P)

    -6. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 23:
    Test point 2 Battery condition monitor module A connector F (20P) No. 19 
    GHH416249Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 11.

    NO 

    Repair an open in the VBU wire between the IPU 33P connector and battery condition monitor module A.

  11. Open wire check (IG1MONI line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 24:
    Test point 2 Battery condition monitor module A connector F (20P) No. 20 
    GHH416251Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 12.

    NO 

    Repair an open in the IG1MONI wire between the IPU 33P connector and battery condition monitor module A.

  12. Open wire check (PG line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Test point 1 Battery condition monitor module A connector F (20P) No. 7 
    Test point 2 Body ground
    Test point 1 Battery condition monitor module A connector F (20P) No. 18 
    Test point 2 Body ground

    Is there continuity?

    YES 

    Go to step 13

    NO 

    Repair an open in the PG wire between battery condition monitor module A and the body ground.

  13. Open wire check (IGAMONI line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 25:
    Test point 2 Battery condition monitor module A connector F (20P) No. 9 
    GHH416253Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 14.

    NO 

    Repair an open in the IGAMONI wire between the IPU 33P connector and battery condition monitor module A.

  14. Open wire check (IGHLDA line)

    -1. Disconnect the following connector.

    Battery condition monitor module A connector G (24P)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Battery condition monitor module A connector G (24P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 28:
    Test point 2 Battery condition monitor module A connector G (24P) No. 3 
    GHH416255Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 15.

    NO 

    Repair an open in the IGHLDA wire between the IPU 33P connector and battery condition monitor module A.

  15. Open wire check (IGB line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Battery condition monitor module A connector G (24P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 33:
    Test point 2 Battery condition monitor module A connector F (20P) No. 10 
    GHH416257Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 16.

    NO 

    Repair an open in the IGB wire between the IPU 33P connector and battery condition monitor module A.

  16. Open wire check (IGHLDB line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Battery condition monitor module A connector G (24P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 22:
    Test point 2 Battery condition monitor module A connector G (24P) No. 16 
    GHH416259Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 17.

    NO 

    Repair an open in the IGHLDB wire between IPU 33P connector battery condition monitor module A.

  17. Open wire check (F-CAN A_H line, F-CAN A_L line) 2

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Battery condition monitor module A connector G (24P): disconnected
    Test point 1 IPU 33P connector (male terminals) No. 26:
    Test point 2 Battery condition monitor module A connector G (24P) No. 12 
    Test point 1 IPU 33P connector (male terminals) No. 27:
    Test point 2 Battery condition monitor module A connector G (24P) No. 24 
    GHH416262Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 18.

    NO 

    Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the IPU 33P connector and battery condition monitor module A.

  18. Shorted wire check (F-CAN A_H line, F-CAN A_L line) 2

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    CAN gateway 16P connector: disconnected
    Battery condition monitor module A connector F (20P): disconnected
    Battery condition monitor module A connector G (24P): disconnected
    Test point 1 Battery condition monitor module A connector G (24P) No. 12 
    Test point 2 Body ground
    Test point 1 Battery condition monitor module A connector G (24P) No. 24 
    Test point 2 Body ground

    Is there continuity?

    YES 

    Repair a short in the F-CAN A_H wire or the F-CAN A_L wire between the IPU 33P connector and battery condition monitor module A.

    NO 

    Check for any authorized service information related to the DTC(s) or symptoms you are troubleshooting or substitute a known-good battery condition monitor module A .

  19. Relay check

    -1. Remove the jumper wire.

    -2. Remove the relay circuit board .

    -3. Test the IGA relay circuit .

    Is the relay OK?

    YES 

    Go to step 20.

    NO 

    Replace the relay circuit board .

  20. Open wire check (+B IGA line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    Relay circuit board: removed
    Test point 1 Relay circuit board connector B (14P) (female terminals) No. 3:
    Test point 2 Body ground
    GHH416264Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 21.

    NO 

    Repair an open in the +B IGA wire between the No. D4 fuse and the relay circuit board.

  21. Open wire check (IGA line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    Relay circuit board: removed
    Test point 1 Relay circuit board connector B (14P) (female terminals) No. 7:
    Test point 2 IPU 33P connector No. 25 
    GHH416266Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair an open in the IG HOLD1 RLY CL- wire between the relay circuit board and the IPU.

    NO 

    Repair an open in the IGA wire between the relay circuit board and the IPU.

  22. Relay check

    -1. Remove the jumper wire.

    -2. Remove the IGB relay .

    -3. Test the IGB relay .

    Is the relay OK?

    YES 

    Go to step 23.

    NO 

    Replace the IGB relay.

  23. Open wire check (+B IGB line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    IGB relay: removed
    Test point 1 IGB relay 4P socket (female terminals) No. 2 and No. 3:
    Test point 2 Body ground
    GHH416268Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 24.

    NO 

    Repair an open in the +B IGB wire between the No. D2 fuse and the IGB relay.

  24. Open wire check (IGB line)

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

    Test condition Vehicle OFF (LOCK) mode
    IPU 33P connector: disconnected
    IGB relay: removed
    Test point 1 IGB relay 4P socket (female terminals) No. 1:
    Test point 2 IPU 33P connector No. 33 
    GHH416270Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair an open in the IG HOLD2 RLY CL- wire between the IGB relay and the IPU.

    NO 

    Repair an open in the IGB wire between the IGB relay and the IPU.

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