DTC P2623

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

   -4. 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
   P0205 No. 5 Cylinder Injector Circuit Malfunction
   P0206 No. 6 Cylinder Injector Circuit Malfunction
   P2623 High Pressure Fuel Pump Spill Valve Malfunction

   Are DTC P2623 and P0201, P0202, P0203, P0204, P0205, or P0206 indicated at the same time?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   The failure is duplicated. Go to step 8.

   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 

   Go to step 3.

   NO 

   Replace the injector relay.

3. Open wire check (+B INJ line)

   -1. 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. 3 and No. 7:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The +B INJ wires are OK. Go to step  5.

   NO 

   Go to step 4.

4. Fuse check

   -1. Check the following fuse.

   Fuse	No. B31 (20 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Repair an open in the +B INJ wire between the No. B31 (20 A) fuse and the injector relay. If needed, replace the under-hood fuse/relay box .

   NO 

   Repair a short in the +B INJ wire between the No. B31 (20 A) fuse and the injector relay. Also replace the No. B31 (20 A) fuse. If needed, replace the under-hood fuse/relay box .

5. Determine possible failure area (FI MAIN RLY CL- line, others)

   -1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle in ON mode
   	Injector relay: disconnected
   Test point 1	Injector relay 4P socket (female terminals) No. 7:
   Test point 2	Injector relay 4P socket (female terminals) No. 8:

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

   Is there battery voltage?

   YES 

   Go to step  7.

   NO 

   Go to step 6.

6. Open wire check (FI MAIN 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 (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Injector relay: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Injector relay 4P socket (female terminals) No. 8:
   Test point 2	PCM connector A (50P) No. 22

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

   Is there continuity?

   YES 

   The FI MAIN 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 , then recheck. If DTC P2623 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the FI MAIN RLY CL- wire between the PCM (A22) and the injector relay.

7. Open wire check (INJ RLY OUT 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 (50P)

   -4. Connect terminals A and B with a jumper wire.

   Terminal A	Injector relay 4P socket (female terminals) No. 3:
   Terminal B	Injector relay 4P socket (female terminals) No. 4:

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Injector relay: disconnected
   	PCM connector A (50P): disconnected
   	Injector relay 4P socket No. 3 and No. 4: jumped
   Test point 1	PCM connector A (50P) No. 1 and No. 8
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The INJ RLY OUT wires are OK. Go to step 8.

   NO 

   Repair an open in the INJ RLY OUT wire between the PCM (A1, A8) and the injector relay.

8. Open wire check (HP+B1/FP+B1 line, HP-B1/FP-B1 line)

   -1. Remove the jumper wire from the injector relay 4P socket as needed.

   -2. Reinstall the injector relay .

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

   -4. Disconnect the following connector.

   PCM connector E (80P)

   -5. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected (if already done)
   	PCM connector E (80P): disconnected
   Test point 1	PCM connector E (80P) No. 1
   Test point 2	PCM connector E (80P) No. 14

   Is there continuity?

   YES 

   The HP+B1/FP+B1 wire and the HP-B1/FP-B1 wire are not open. Go to step  11.

   NO 

   Go to step 9.

9. Open wire check (HP+B1/FP+B1 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 (50P): disconnected (if already done)
   	PCM connector E (80P): 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 E (80P) No. 14

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

   Is there continuity?

   YES 

   The HP+B1/FP+B1 wire is not open. Go to step 10.

   NO 

   Repair an open in the HP+B1/FP+B1 wire between the PCM (E14) and the high pressure fuel pump.

10. Open wire check (HP-B1/FP-B1 line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (50P): disconnected (if already done)
    	PCM connector E (80P): 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 E (80P) No. 1

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

    Is there continuity?

    YES 

    The HP-B1/FP-B1 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P2623 goes away and the PCM was substituted, replace the original PCM .

    NO 

    Repair an open in the HP-B1/FP-B1 wire between the PCM (E1) and the high pressure fuel pump.

11. Shorted wire check (HP+B1/FP+B1 line to power)

    -1. Disconnect the following connector.

    High pressure fuel pump 2P connector

    -2. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	PCM connector A (50P): disconnected (if already done)
    	PCM connector E (80P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector E (80P) No. 14
    Test point 2	Body ground

    Is there any voltage?

    YES 

    Repair a short to power in the HP+B1/FP+B1 wire between the PCM (E14) and the high pressure fuel pump.

    NO 

    Go to step 12.

12. Shorted wire check (HP-B1/FP-B1 line to power)

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

    Test condition	Vehicle ON mode
    	PCM connector A (50P): disconnected (if already done)
    	PCM connector E (80P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector E (80P) No. 1
    Test point 2	Body ground

    Is there any voltage?

    YES 

    Repair a short to power in the HP-B1/FP-B1 wire between the PCM (E1) and the high pressure fuel pump.

    NO 

    Go to step 13.

13. Shorted wire check (HP+B1/FP+B1 line to ground)

    -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 (50P): disconnected (if already done)
    	PCM connector E (80P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector E (80P) No. 14
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the HP+B1/FP+B1 wire between the PCM (E14) and the high pressure fuel pump.

    NO 

    The HP+B1/FP+B1 wire is OK. Go to step 14.

14. Shorted wire check (HP-B1/FP-B1 line to ground)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (50P): disconnected (if already done)
    	PCM connector E (80P): disconnected
    	High pressure fuel pump 2P connector: disconnected
    Test point 1	PCM connector E (80P) No. 1

    Test point 2

    Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the HP-B1/FP-B1 wire between the PCM (E1) and the high pressure fuel pump.

    NO 

    The HP-B1/FP-B1 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P2623 goes away and the PCM was substituted, replace the original PCM .