DTC P2623: High Pressure Fuel Pump Spill Valve Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .

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	Freeze Frame
  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 freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

• 2. Relay check:

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

  - 2. Remove the injector relay from auxiliary under-hood relay holder A.

  - 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 No. 7
  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 No. 5
  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. A12 (20 A)
  Location	Under-hood fuse/relay box

  Is the fuse OK?

  YES 

  Repair an open in the +B INJ wire between the No. A12 (20 A) fuse and the injector relay.

  NO 

  Repair a short in the +B INJ wire between the No. A12 (20 A) fuse and the injector relay. Also replace the No. A12 (20 A) fuse.

• 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 No. 7
  Test point 2	Injector relay 4P socket No. 8

  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 No. 8
  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. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P2623 goes away and the PCM was updated, troubleshooting is complete. If DTC P2623 goes away and the PCM was substituted, replace the original 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 No. 5
  Terminal B	Injector relay 4P socket No. 6

  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 and 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. Reinstall the injector relay.

  - 2. Disconnect the following connector.

  PCM connector C (51P)

  - 3. 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 10.

  NO 

  Go to step 12.

• 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 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 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. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P2623 goes away and the PCM was updated, troubleshooting is complete. If DTC P2623 goes away and the PCM was substituted, replace the original 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. 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 (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 any 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 

  The HPUMP H wire is OK. 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. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P2623 goes away and the PCM was updated, troubleshooting is complete. If DTC P2623 goes away and the PCM was substituted, replace the original PCM .