EPS Indicator Does Not Go Off, And No DTCs Are Stored (With Auto Idle Stop System) (2018-19)

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 (PGM-FI system)

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0A94 VOLTAGE STABILIZER MALFUNCTION

   Is DTC P0A94 indicated?

   YES 

   Go to indicated DTC's troubleshooting.

   NO 

   Go to step 4.

4. DTC check (Body electrical system)

   - 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 5.

5. DTC check (CAN gateway system)

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

   DTC Description	DTC

   Is DTC indicated?

   YES 

   Go to indicated DTCs troubleshooting.

   NO 

   Go to step 6.

6. Gauge control module operation check

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

   Does the EPS indicator blink?

   YES 

   Go to step 7.

   NO 

   Replace the gauge control module .

7. 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 8.

   NO 

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

8. Fuse check 2

   - 1. Check the following fuse.

   Fuse	No. B13 (15 A)
   Location	Under-dash fuse/relay box

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 9.

   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. B13 (15 A) fuse circuit.

9. Fuse check 3

   - 1. Check the following fuse.

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

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 10.

   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 in the No. GA (7. 5A) fuse circuit.

10. DC-DC converter IG1 relay check

    - 1. Remove the DC-DC converter IG1 relay from the under-dash sub fuse/relay box B, and test it.

    Is the relay OK?

    YES 

    The relay is OK. Reinstall the relay, then go to step 11.

    NO 

    Replace the DC-DC converter IG1 relay.

11. Open wire check (IG1 VSA (DC) line) 1

    - 1. Disconnect the following connector.

    EPS control unit connector A (11P)

    - 2. Turn the vehicle to the ON mode.

    - 3. 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 (2018-19)
    Test point 2	Body ground

    Is there battery voltage?

    YES 

    The IG1 VSA (DC) wire is OK. Go to step  16.

    NO 

    Go to step 12.

12. Open wire check (IG1 VSA (DC) line) 2

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

    - 2. Remove the DC-DC converter IG1 relay from the under-dash sub fuse/relay box B.

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

    Test condition	Vehicle OFF (LOCK) mode
    	EPS control unit connector A (11P): disconnected
    	DC-DC converter IG1 relay: removed
    Test point 1	EPS control unit connector A (11P) No. 9 - Refer to: EPS Control Unit Connector for Inputs and Outputs (2018-19)
    Test point 2	DC-DC converter IG1 relay 4P socket (female terminals) No. 1:

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

    Is there continuity?

    YES 

    The IG1 VSA (DC) wire is OK. Go to step 13.

    NO 

    Repair an open in the wire between the EPS control unit and the DC-DC converter IG1 relay.

13. Open wire check (+B DC1 OUT2 line)

    - 1. Disconnect the following connector.

    DC-DC converter connector B (5P)

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

    Test condition	Vehicle OFF (LOCK) mode
    	EPS control unit connector A (11P): disconnected
    	DC-DC converter IG1 relay: removed
    	DC-DC converter connector A (5P): disconnected
    Test point 1	DC-DC converter IG1 relay 4P socket (female terminals) No. 2:
    Test point 2	DC-DC converter connector B (5P) (female terminals) No. 5:

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

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

    Is there continuity?

    YES 

    The +B DC1 OUT2 wire is OK. Go to step 14.

    NO 

    Repair an open in the wire between the DC-DC converter IG1 relay and the DC-DC converter.

14. Open wire check (IG1 ACG 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
    	DC-DC converter IG1 relay: removed
    	DC-DC converter connector B (5P): disconnected
    Test point 1	DC-DC converter IG1 relay 4P socket (female terminals) No. 3:
    Test point 2	Body ground

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

    Is there battery voltage?

    YES 

    The IG1 ACG wire is OK. Go to step 15.

    NO 

    Repair an open in the wire between the under-dash fuse/relay box and the DC-DC converter IG1 relay.

15. Open wire check (GND line) 1

    - 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
    	DC-DC converter IG1 relay: removed
    	DC-DC converter connector B (5P): disconnected
    Test point 1	DC-DC converter IG1 relay 4P socket (female terminals) No. 4:
    Test point 2	Body ground

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

    Is there continuity?

    YES 

    The GND wire is OK. Replace the DC-DC converter .

    NO 

    Repair an open or high resistance in the wire between the DC-DC converter IG1 relay and body ground (G306).

16. Open wire check (+B EPS line)

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

    - 2. Disconnect the following connector.

    EPS control unit connector A (11P)

    - 3. 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 (2018-19)
    Test point 2	Body ground

    Is there battery voltage?

    YES 

    The +B EPS wire is OK. Go to step 17.

    NO 

    Repair an open in the wire between the EPS control unit and the No. A1-1 (70A) fuse.

17. Open wire check (GND line) 2

    - 1. 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 (2018-19)
    Test point 2	Body ground

    Is there continuity?

    YES 

    The GND wire is OK. Go to step 18.

    NO 

    Repair an open in the wire between the EPS control unit and body ground (G201).

18. 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 (Bus A) is Not Available 

    Go to step 19.

    Gauge control module (Bus A) is Not Available 

    Go to step  20.

    EPS control unit and gauge control module are Detected 

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

19. 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 16P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    	EPS control unit connector A (11P): disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	EPS control unit connector A (11P) No. 10 - Refer to: EPS Control Unit Connector for Inputs and Outputs (2018-19)
    Test point 2	CAN gateway 16P connector (female terminals) No. 3:

    Test point 1	EPS control unit connector A (11P) No. 11 - Refer to: EPS Control Unit Connector for Inputs and Outputs (2018-19)
    Test point 2	CAN gateway 16P connector (female terminals) No. 11:

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

    Is there continuity?

    YES 

    The F-CAN A_H and the F-CAN A_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS control unit , then recheck. If the symptom/indication goes away with a known-good EPS control unit, replace the original EPS control unit .

    NO 

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

20. 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 16P 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 16P connector: disconnected
    Test point 1	Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Connector for Inputs and Outputs (2018-19)
    Test point 2	CAN gateway 16P connector (female terminals) No. 3:

    Test point 1	Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Connector for Inputs and Outputs (2018-19)
    Test point 2	CAN gateway 16P connector (female terminals) No. 11:

    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 16P 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.

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) .