DTC P2623 (2.4 L Engine) (2017 2018 2019)

DTC P2623  : High Pressure Fuel Pump Spill Valve Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

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

   -4. Start the engine. (If the engine does not start, crank the engine for 20 seconds).

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P0201 No. 1 Cylinder Injector Circuit Malfunction
   P0202 No. 2 Cylinder Injector Circuit Malfunction
   P0203 No. 3 Cylinder Injector Circuit Malfunction
   P0204 No. 4 Cylinder Injector Circuit Malfunction
   P2623 High Pressure Fuel Pump Spill Valve Malfunction

   Are DTC P2623 and P0201, P0202, P0203, or P0204 indicated at the same time?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   The failure is duplicated. Go to step 9.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the high pressure fuel pump and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

2. Relay check

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

   -2. Remove the injector relay .

   -3. Test the injector relay .

   Is the relay OK?

   YES 

   The injector relay is OK. Go to step 3.

   NO 

   Replace the injector relay.

3. Open wire check (FI MAIN RLY OUT line)

   -1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Injector relay: disconnected
   Test point 1	Injector 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 FI MAIN RLY OUT wire is OK. Go to step 4.

   NO 

   Repair an open in the FI MAIN RLY OUT wire between PGM-FI main relay 1 and the injector relay.

4. Open wire check (+B INJ line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Injector relay: disconnected
   Test point 1	Injector relay 4P socket (female terminals) No. 1:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

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

   NO 

   Go to step 5.

5. Fuse check

   -1. Check the following fuse.

   Fuse	No. A10 (20 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Repair an open in the +B INJ wire between the No. A10 (20 A) fuse and the injector relay.

   NO 

   Repair a short in the +B INJ wire between the No. A10 (20 A) fuse and the injector relay. Also replace the No. A10 (20 A) fuse. If needed, replace the under-hood fuse/relay box .

6. Determine possible failure area (INJ RLY CL- line, others)

   -1. Turn the vehicle to the ON mode, and measure the voltage between test points 1 and 2 momentarily.

   Test condition	Momentarily after vehicle in ON mode
   	Injector relay: disconnected
   Test point 1	Injector relay 4P socket (female terminals) No. 3:
   Test point 2	Injector relay 4P socket (female terminals) No. 4:

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

   Is there battery voltage momentarily?

   YES 

   Go to step 8.

   NO 

   Go to step 7.

7. Open wire check (INJ RLY CL- 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 connector.

   PCM connector A (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected

   Test point 1	Injector relay 4P socket (female terminals) No. 4:
   Test point 2	PCM connector A (51P) No. 15

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

   Is there continuity?

   YES 

   The INJ RLY CL- wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Repair an open in the INJ RLY CL- wire between the PCM (A15) and the injector relay.

8. Open wire check (INJ RLY OUT line)

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

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

   Terminal A	Injector relay 4P socket (female terminals) No. 1:
   Terminal B	Injector relay 4P socket (female terminals) No. 2:

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

   -3. Jump the SCS line with the HDS, and wait more than 1 minute.

   -4. Disconnect the following connector.

   PCM connector A (51P)

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Injector relay: disconnected
   	Injector relay 4P socket terminal No. 1 and No. 2: jumped
   	PCM connector A (51P): disconnected
   Test point 1	PCM connector A (51P) No. 6
   Test point 2	Body ground

   Test point 1	PCM connector A (51P) No. 7
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The INJ RLY OUT wire is OK. Go to step 9.

   NO 

   Repair an open in the INJ RLY OUT wire between the PCM (A6, A7) and the injector relay.

9. Open wire check (HPUMP H line, HPUMP L line)

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

   -2. Remove the jumper wire from the injector relay 4P socket as needed.

   -3. Reinstall the injector relay.

   -4. Jump the SCS line with the HDS, and wait more than 1 minute.

   -5. Disconnect the following connector.

   PCM connector C (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 13
   Test point 2	PCM connector C (51P) No. 14

   Is there continuity?

   YES 

   The HPUMP H and HPUMP L wires are not open. Go to step 12.

   NO 

   Go to step 10.

10. Open wire check (HPUMP H line)

    -1. Disconnect the following connector.

    High pressure fuel pump 2P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	PCM connector C (51P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	High pressure fuel pump 2P connector (female terminals) No. 1:
    Test point 2	PCM connector C (51P) No. 13

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

    Is there continuity?

    YES 

    The HPUMP H wire is not open. Go to step 11.

    NO 

    Repair an open in the HPUMP H wire between the PCM (C13) and the high pressure fuel pump.

11. Open wire check (HPUMP L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	PCM connector C (51P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	High pressure fuel pump 2P connector (female terminals) No. 2:
    Test point 2	PCM connector C (51P) No. 14

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

    Is there continuity?

    YES 

    The HPUMP L wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

    NO 

    Repair an open in the HPUMP L wire between the PCM (C14) and the high pressure fuel pump.

12. Shorted wire check (HPUMP H line to power)

    -1. Disconnect the following connector.

    High pressure fuel pump 2P connector

    -2. Exit the SCS mode with the HDS.

    -3. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	PCM connector A (51P): disconnected
    	PCM connector C (51P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector C (51P) No. 13
    Test point 2	Body ground

    Is there any voltage?

    YES 

    Repair a short to power in the HPUMP H wire between the PCM (C13) and the high pressure fuel pump.

    NO 

    Go to step 13.

13. Shorted wire check (HPUMP L line to power)

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

    Test condition	Vehicle ON mode
    	PCM connector A (51P): disconnected
    	PCM connector C (51P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector C (51P) No. 14
    Test point 2	Body ground

    Is there voltage?

    YES 

    Repair a short to power in the HPUMP L wire between the PCM (C14) and the high pressure fuel pump.

    NO 

    Go to step 14.

14. Shorted wire check (HPUMP H 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
    	PCM connector A (51P): disconnected
    	PCM connector C (51P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector C (51P) No. 13
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short in the HPUMP H wire between the PCM (C13) and the high pressure fuel pump.

    NO 

    Go to step 15.

15. Shorted wire check (HPUMP L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	PCM connector C (51P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector C (51P) No. 14
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short in the HPUMP L wire between the PCM (C14) and the high pressure fuel pump.

    NO 

    The HPUMP L wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .