DLC Circuit Troubleshooting (PGM-FI System)

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, similar 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. HDS communication check

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

   -2. Connect the HDS to the DLC .

   NOTE:  Make sure the HDS is properly connected to the DLC.

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

   Does the HDS identify the vehicle?

   YES 

   Go to step 2.

   NO 

   Go to step 14.

2. Determine possible failure area (PGM-FI system, other systems)

   -1. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

   DTC Description	Confirmed DTC	Pending DTC

   DTC (PGM-FI)

   Are any Pending or Confirmed DTCs indicated?

   YES 

   Go to the indicated DTC's troubleshooting.

   NO 

   If the HDS does not communicate with the PCM, go to step 3.

   NO 

   If the HDS does not communicate with the SRS, go to step 5.

   NO 

   If the HDS does not communicate with the VSA system, go to step 6.

   NO 

   If the HDS does not communicate with the EPS system, go to step 7.

   NO 

   If the HDS does not communicate with the ONE-PUSH START system, go to step 8.

   NO 

   If the HDS does not communicate with the BODY ELECTRICAL system, go to step 9.

   NO 

   If the HDS does not communicate with the DRIVING SUPPORT system, go to step 10.

3. Open wire check (F-CAN A_H line)

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

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   CAN gateway 16P connector

   PCM connector A (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	PCM connector A (50P) No. 39

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

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 4.

   NO 

   Repair an open in the F-CAN A_H wire between the PCM (A39) and the CAN gateway.

4. Open wire check (F-CAN A_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	PCM connector A (50P) No. 38

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Go to the PCM power and ground circuit troubleshooting .

   NO 

   Repair an open in the F-CAN A_L wire between the PCM (A38) and the CAN gateway.

5. SRS check

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

   -2. Turn the vehicle to the ON mode, and watch the SRS indicator.

   Does the SRS indicator come on and go off?

   YES 

   The SRS is OK. Go to step 11.

   NO 

   Go to the symptom troubleshooting for SRS indicator stays on, but no DTCs are stored, or cannot be read .

6. VSA system check

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

   -2. Turn the vehicle to the ON mode, and watch the VSA indicator.

   Does the VSA indicator come on and go off?

   YES 

   The VSA system is OK. Go to step 11.

   NO 

   Go to the symptom troubleshooting for ABS indicator, brake system indicator (red), VSA indicator, and brake system indicator (amber) do not go off .

7. EPS system check

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

   -2. Enter the maintenance mode, then start the engine , and watch the EPS indicator.

   Does the EPS indicator come on and go off?

   YES 

   The EPS system is OK. Go to step 11.

   NO 

   Go to the EPS symptom troubleshooting for EPS indicator does not go off .

8. Keyless access system check

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

   -2. Turn the vehicle to the ON mode, and watch the security indicator.

   Does the security indicator stay on or blinkΩ

   YES 

   Go to the keyless access system symptom troubleshooting information .

   NO 

   The keyless access system is OK. Go to step 11.

9. Body electrical system check

   -1. Do the gauge control module self-diagnostic function .

   -2. Check the gauge display.

   Is B-CAN-----ERROR indicated?

   YES 

   Go to the indicated DTC's troubleshooting.

   NO 

   The body electrical system is OK. Go to step 11.

10. Driving support system check

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

    -2. Turn the vehicle to the ON mode, and watch the ACC indicator, the CMBS/FCW indicator, the LKAS indicator, and the RDM/LDW indicator.

    Does the ACC indicator, the CMBS/FCW indicator, the LKAS indicator, and/or the RDM/LDW indicator come on and go off?

    YES 

    The driving support system is OK. Go to step 11.

    NO 

    Go to the driving support system symptom troubleshooting; ACC , CMBS , LKAS , RDM .

11. Open wire check (K-LINE line or L-LINE line)

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

    -2. Disconnect the HDS from the DLC.

    Disconnect the control unit (s) on the K-LINE or L-LINE that does not communicate.

    NOTE:  Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

    K-LINE 

    • Audio unit connector A (24P) (Without navigation)
    • Audio-navigation unit connector A (24P) (With navigation)
    • Active noise cancellation unit 20P connector
    • Body control module connector B (66P)

    L-LINE 

    • Body control module connector C (66P)
    • SRS unit connector A (39P)

    -4. Check for continuity between DLC (16P) No. 7 (K-LINE line) and these connector terminals, or DLC (16P) No. 15 (L-LINE line) and these connector terminals:

    K-LINE 

    Connector	Terminal
    Audio unit connector A (24P) (Without navigation)	No. 12
    Audio-navigation unit connector A (24P) (With navigation)	No. 12
    Active noise cancellation unit 20P connector	No. 14
    Body control module connector B (66P)	No. 38

    L-LINE 

    Connector	Terminal
    Body control module connector C (66P)	No. 53
    SRS unit connector A (39P)	No. 33

    Is there continuity between the DLC and the terminals in the chart?

    YES 

    Go to step 12.

    NO 

    Repair an open in the wire between the DLC (K-LINE wire or L-LINE wire) and the appropriate connector.

12. Determine possible failure area (short in K-LINE line or L-LINE line, others)

    -1. Reconnect all connectors.

    -2. If the 12 volt battery negative terminal is disconnected in step 11-3, do the 12 volt battery terminal reconnection procedure .

    -3. Turn the vehicle to the ON mode.

    -4. Measure the voltage between test points 1 and 2.

    Test condition	Vehicle ON mode
    Test point 1	DLC (16P) (female terminals) No. 7 and No. 15:
    Test point 2	Body ground

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

    Is there any voltage?

    YES 

    Go to step 14.

    NO 

    Go to step 13.

13. Shorted wire check (K-LINE line, L-LINE line):

    Continue to measure the voltage between DLC (16P) No. 7 (K-LINE line) and body ground, or DLC (16P) No. 15 (L-LINE line) and body ground while disconnecting these parts, one at a time:

    NOTE:  Turn the vehicle to the OFF (LOCK) mode before disconnecting the connector, and turn the vehicle to the ON mode before measuring the voltage.

    K-LINE 

    • Audio unit connector A (24P) (Without navigation)
    • Audio-navigation unit connector A (24P) (With navigation)
    • Active noise cancellation unit 20P connector
    • Body control module connector B (66P)

    L-LINE 

    • Body control module connector C (66P)
    • SRS unit connector A (39P)

      NOTE:  Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

    Does voltage come back when one of the above components is disconnected?

    YES 

    Replace the part that any voltage was detected when it was disconnected.

    NO 

    Repair a short in the wire between the DLC (16P) No. 7 (K-LINE) and the audio unit (Without navigation), the audio-navigation unit (With navigation), the active noise cancellation control unit, the body control module, or the DLC (16P) No. 15 (L-LINE) and the body control module, the SRS unit.

14. Body electrical system (B-CAN) check

    -1. Do the gauge control module self-diagnostic function .

    -2. Check for gauge control module DTCs without the HDS.

    Is DTC U0029 and/or U0100 indicated?

    YES 

    Do the PCM power and ground circuit troubleshooting .

    NO 

    Go to step 15.

15. Open wire check (+B BACK UP line)

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

    -2. Disconnect the HDS from the DLC.

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

    Test condition	Vehicle OFF (LOCK) mode
    Test point 1	DLC (16P) (female terminals) No. 16:
    Test point 2	Body ground

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

    Is there battery voltage?

    YES 

    The +B BACK UP wire is OK. Go to step 16.

    NO 

    Repair an open in the +B BACK UP wire between DLC (16P) No. 16 and the No. B10 fuse .

16. Open wire check (GND line)

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

    Test condition	Vehicle OFF (LOCK) mode
    Test point 1	DLC (16P) (female terminals) No. 4:
    Test point 2	DLC (16P) (female terminals) No. 16:

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

    Is there battery voltage?

    YES 

    The GND wire is OK. Go to step 17.

    NO 

    Repair an open in the GND wire between DLC (16P) No. 4 and G401.

17. Open wire check (+B BACK UP line)

    -1. Disconnect the following connector.

    CAN gateway 16P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    Test point 1	CAN gateway 16P connector (female terminals) No. 1:
    Test point 2	Body ground

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

    Is there battery voltage?

    YES 

    The +B BACK UP wire is OK. Go to step 18.

    NO 

    Repair an open in the +B BACK UP wire between CAN gateway (16P) No. 1 and the No. B10 fuse .

18. Open wire check (IG1 METER line)

    -1. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 9:
    Test point 2	Body ground

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

    Is there battery voltage?

    YES 

    The IG1 METER wire is OK. Go to step 19.

    NO 

    Repair an open in the IG1 METER wire between the CAN gateway and the No. C7 fuse .

19. Open wire check (GND line)

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 12:
    Test point 2	Body ground

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

    Is there continuity?

    YES 

    The GND wire is OK. Go to step 20.

    NO 

    Repair an open in the GND wire between the CAN gateway and G401.

20. Open wire check (DIAG-CAN_H line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 2:
    Test point 2	DLC (16P) (female terminals) No. 6:

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

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

    Is there continuity?

    YES 

    The DIAG-CAN_H wire is not open. Go to step 21.

    NO 

    Repair an open in the DIAG-CAN_H wire between the CAN gateway and the DLC (16P) No. 6.

21. Open wire check (DIAG-CAN_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 10:
    Test point 2	DLC (16P) (female terminals) No. 14:

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

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

    Is there continuity?

    YES 

    The DIAG-CAN_L wire is not open. Go to step 22.

    NO 

    Repair an open in the DIAG-CAN_L wire between the CAN gateway and the DLC (16P) No. 14.

22. Shorted wire check (DIAG-CAN_H line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 16P connector: disconnected
    Test point 1	DLC (16P) (female terminals) No. 6:
    Test point 2	Body ground

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

    Is there continuity?

    YES 

    Repair a short in the DIAG-CAN_H wire between the CAN gateway and the DLC (16P) No. 6.

    NO 

    The DIAG-CAN_H wire is not shorted to ground. Go to step 23.

23. Shorted wire check (DIAG-CAN_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 16P connector: disconnected
    Test point 1	DLC (16P) (female terminals) No. 14:
    Test point 2	Body ground

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

    Is there continuity?

    YES 

    Repair a short in the DIAG-CAN_L wire between the CAN gateway and the DLC (16P) No. 14.

    NO 

    The DIAG-CAN_L wire is not shorted to ground. Go to step 24.

24. Shorted wire check (DIAG-CAN_H line to DIAG-CAN_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 16P connector: disconnected
    Test point 1	DLC (16P) (female terminals) No. 6:
    Test point 2	DLC (16P) (female terminals) No. 14:

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

    Is there continuity?

    YES 

    Repair a short in the DIAG-CAN_H wire to the DIAG-CAN_L wire between DLC (16P) No. 6 and No. 14.

    NO 

    The DIAG-CAN_H wire and the DIAG-CAN_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good CAN gateway , then recheck. If the HDS identifies the vehicle and the CAN gateway was substituted, replace the original CAN gateway .