EPS Indicator Does Not Go Off, And No DTCs Are Stored (With ACC) (2015-17)

1. Problem verification

   - 1. Start the engine.

   - 2. Check the EPS indicator.

   Does the EPS indicator come on, then go off?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   Go to step 2.

2. DTC check

   - 1. Test-drive the vehicle at 6 mph (10 km/h) or more.

   - 2. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame

   Are there DTCs indicated?

   YES 

   Go to indicated DTC's troubleshooting.

   NO 

   Go to step 3.

3. DTC check (CAN gateway system)

   - 1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off
   U0047-00 CAN Gateway F-CAN ch B Bus Off
   U3000-49 CAN Gateway Internal Failure

   Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?

   YES 

   Go to indicated DTCs troubleshooting.

   NO 

   Go to step 4.

4. Gauge control module operation check

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

   Does the EPS indicator blink?

   YES 

   Go to step 5.

   NO 

   Replace the gauge control module .

5. Body electrical system DTC check

   - 1. Check for DTCs in the gauge control module with the HDS.

   DTC Description	DTC

   Is DTC indicated?

   YES 

   Go to indicated DTC's troubleshooting.

   NO 

   Go to step 6.

6. Fuse check 1

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

   - 2. Check the following fuse.

   Fuse	No. A1-1 (70 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 7.

   NO 

   Replace the fuse. If the fuse blows again, repair a short to ground on the No. A1-1 (70 A) fuse circuit.

7. Fuse check 2

   - 1. Check the following fuse.

   Fuse	No. B10 (7. 5 A)
   Location	Under-dash fuse/relay box

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 8.

   NO 

   Replace the fuse. Turn the vehicle to the ON mode, then to the OFF (LOCK) mode. If the fuse blows again, repair a short to ground on the No. B10 (7. 5 A) fuse circuit.

8. Open wire check (+B EPS line)

   - 1. Disconnect the following connector.

   EPS control unit connector A (11P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	EPS control unit connector A (11P): disconnected
   Test point 1	EPS control unit connector A (11P) No. 2 - Refer to: EPS Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or EPS Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17)
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B EPS wire is OK. Go to step 9.

   NO 

   Repair an open in the wire between the under-hood fuse/relay box and the EPS control unit.

9. Open wire check (IG1 VSA/ABS line)

   - 1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	EPS control unit connector A (11P): disconnected
   Test point 1	EPS control unit connector A (11P) No. 9 - Refer to: EPS Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or EPS Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17)
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The IG1 VSA/ABS wire is OK. Go to step 10.

   NO 

   Repair an open in the wire between the under-dash fuse/relay box and the EPS control unit.

10. 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
    	EPS control unit connector A (11P): disconnected
    Test point 1	EPS control unit connector A (11P) No. 1 - Refer to: EPS Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or EPS Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17)
    Test point 2	Body ground

    Is there continuity?

    YES 

    The GND wire is OK. Go to step 11.

    NO 

    Repair an open in the wire between the EPS control unit and body ground (G402).

11. F-CAN circuit communication check

    - 1. Reconnect the following connector.

    EPS control unit connector A (11P)

    - 2. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

    F-CAN Bus Connected Unit Check

    Which result is indicated?

    EPS control unit is Not Available 

    Go to step 12.

    Gauge control module is Not Available 

    Go to step 13.

    EPS control unit and gauge control module are Detected 

    Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

12. Open wire check (F-CAN A_H, F-CAN A_L lines) 1

    - 1. Disconnect the following connectors.

    EPS control unit connector A (11P)

    CAN gateway 24P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    	EPS control unit connector B (11P): disconnected
    	CAN gateway 24P connector: disconnected
    Test point 1	EPS control unit connector B (11P) No. 10 - Refer to: EPS Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or EPS Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17)
    Test point 2	CAN gateway 24P connector No. 14

    Test point 1	EPS control unit connector B (11P) No. 11 - Refer to: EPS Control Unit Connector for Inputs and Outputs (With Auto Idle Stop System) (2015-17),  or EPS Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17)
    Test point 2	CAN gateway 24P connector No. 15

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

    Is there continuity?

    YES 

    The F-CAN A_H and F-CAN A_L wires are OK. Go to step 14.

    NO 

    Repair an open in the wire between the EPS control unit and the CAN gateway.

13. Open wire check (F-CAN A_H, F-CAN A_L lines) 2

    - 1. Disconnect the following connectors.

    Gauge control module 32P connector

    CAN gateway 24P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    	Gauge control module 32P connector: disconnected
    	CAN gateway 24P connector: disconnected
    Test point 1	Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Connector for Inputs and Outputs (Without SH-AWD) (2015-17), or Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17)
    Test point 2	CAN gateway 24P connector No. 14

    Test point 1	Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Connector for Inputs and Outputs (Without SH-AWD) (2015-17), or Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17)
    Test point 2	CAN gateway 24P connector No. 15

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

    Is there continuity?

    YES 

    Check for loose terminals in the gauge control module 32P connector and CAN gateway 24P connector. If they are OK, substitute a known-good gauge control module , then retest. If the indicators come on then go off after substitution, replace the original gauge control module .

    NO 

    Repair an open in the wire between the gauge control module and the CAN gateway.

14. EPS control unit check (update)

    - 1. Reconnect the following connectors.

    EPS control unit connector A (11P)

    CAN gateway 24P connector

    - 2. Update the EPS control unit if it does not have the latest software.

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

    - 4. Start the engine.

    - 5. Check the EPS indicator.

    Does the EPS indicator come on, then go off?

    YES 

    Troubleshooting is complete.

    NO 

    Replace the EPS control unit .

Do the gauge control module self-diagnostic function - Refer to: Gauges Self-Diagnostic Function (Without SH-AWD), or Gauges Self-Diagnostic Function (With SH-AWD) .