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Fuel Pump Circuit Troubleshooting (2.4 L Engine) (2017 2018 2019)

Fuel Pump Circuit Troubleshooting 

If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is on, you will hear some noise if you listen to the fuel fill port. The fuel pump should run for 2 seconds when the vehicle is turned to ON mode. If the fuel pump does not make noise, check as follows:

  1. Determine possible failure area (FI MAIN RLY OUT line, others)

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

    -2. Remove PGM-FI main relay 2 .

    -3. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      PGM-FI main relay 2: disconnected
    Test point 1 PGM-FI main relay 2 4P socket (female terminals) No. 3:
    Test point 2 Body ground
    GHH427891Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 3.

    NO 

    Go to step 2.

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

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

    -2. Disconnect the following connector.

    Relay circuit board connector C (18P)

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

    Test condition Vehicle OFF (LOCK) mode
    PGM-FI main relay 2: disconnected
    Relay circuit board connector C (18P): disconnected
    Test point 1 Relay circuit board connector C (18P) (female terminals) No. 17:
    Test point 2 PGM-FI main relay 2 4P socket (female terminals) No. 3:
    GHH427894Courtesy of HONDA, U.S.A., INC.
    GHH427895Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Remove and test the relay circuit board , and replace it if needed.

    NO 

    Repair an open in the FI MAIN RLY OUT wire between the relay circuit board and PGM-FI main relay 2.

  3. Open wire check (IG1 FUEL PUMP line)

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

    Test condition Vehicle ON mode
      PGM-FI main relay 2: disconnected
    Test point 1 PGM-FI main relay 2 4P socket (female terminals) No. 1:
    Test point 2 Body ground
    GHH427897Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 4.

    NO 

    Check the No. D8 (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair an open in the IG1 FUEL PUMP wire between the No. D8 (15 A) fuse and PGM-FI main relay 2. If needed, replace the under-dash fuse/relay box .

  4. Open wire check (FUEL PUMP 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
      PGM-FI main relay 2: disconnected
      PCM connector A (51P): disconnected
    Test point 1 PGM-FI main relay 2 4P socket (female terminals) No. 4:
    Test point 2 PCM connector A (51P) No. 14
    GHH427899Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The FUEL PUMP RLY CL- wire is OK. Go to step 5.

    NO 

    Repair an open in the FUEL PUMP RLY CL- wire between the PCM (A14) and PGM-FI main relay 2.

  5. Determine possible failure area (PGM-FI main relay 2, others)

    -1. Reinstall PGM-FI main relay 2.

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

    Terminal A PCM connector A (51P) No. 3
    Terminal B Body ground

    -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 A (51P) No. 3: jumped to body ground
    Test point 1 PCM connector A (51P) No. 14
    Test point 2 Body ground

    Is there battery voltage?

    YES 

    Go to step 6.

    NO 

    Replace PGM-FI main relay 2.

  6. PCM operation check

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

    -2. Remove PGM-FI main relay 2 .

    -3. Remove the jumper wire from PCM connector A (50P).

    -4. Reconnect PCM connector A (51P).

    -5. Exit the SCS mode with the HDS.

    -6. Turn the vehicle to the ON mode, and measure the voltage between test points 1 and 2.

    Test condition Within 2 seconds after turning vehicle to ON mode
      PGM-FI main relay 2: disconnected
    Test point 1 PGM-FI main relay 2 4P socket (female terminals) No. 3:
    Test point 2 PGM-FI main relay 2 4P socket (female terminals) No. 4:
    GHH427902Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 7.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .

  7. Determine possible failure area (FUEL PUMP RLY OUT line, GND line)

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

    -2. Disconnect the following connector.

    Fuel tank unit 4P connector

    -3. Reinstall PGM-FI main relay 2.

    -4. Turn the vehicle to the ON mode, and measure the voltage between test points 1 and 2.

    Test condition Within 2 seconds after turning vehicle to ON mode
      Fuel tank unit 4P connector: disconnected
    Test point 1 Fuel tank unit 4P connector (female terminals) No. 1:
    Test point 2 Body ground
    GHH427904Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 9.

    NO 

    Go to step 8.

  8. Open wire check (FUEL PUMP RLY OUT line)

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

    -2. Remove PGM-FI main relay 2 .

    -3. Connect terminals A and B with a jumper wire.

    Terminal A PGM-FI main relay 2 4P socket (female terminals) No. 1:
    Terminal B PGM-FI main relay 2 4P socket (female terminals) No. 2:
    GHH427907Courtesy of HONDA, U.S.A., INC.

    -4. Turn the vehicle to the ON mode.

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

    Test condition Vehicle ON mode
      Fuel tank unit 4P connector: disconnected
      PGM-FI main relay 2 :disconnected
      PGM-FI main relay 2 4P socket No. 1 and No. 2: jumped
    Test point 1 Fuel tank unit 4P connector (female terminals) No. 1:
    Test point 2 Body ground
    GHH427909Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The FUEL PUMP RLY OUT wire is OK. Replace PGM-FI main relay 2.

    NO 

    Repair an open in the FUEL PUMP RLY OUT wire between PGM-FI main relay 2 and the fuel tank unit.

  9. 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
      Fuel tank unit 4P connector: disconnected
    Test point 1 Fuel tank unit 4P connector (female terminals) No. 3:
    Test point 2 Body ground
    GHH427911Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The GND wire is OK. Replace the fuel pump .

    NO 

    Repair an open in the GND wire between the fuel tank unit and G503.

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