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Home >> Honda >> 2021 >> CR-V EX-L, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Fuel And Emissions - Testing & Troubleshooting (Hybrid)) >> Troubleshooting >> Fuel Pump Circuit Troubleshooting

Fuel Pump Circuit Troubleshooting

WARNING: This page is about a different variant/trim than selected.

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
    GHH378899Courtesy 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. Measure the resistance 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:
    GHH378902Courtesy of HONDA, U.S.A., INC.
    GHH378903Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    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
    GHH378905Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 4.

    NO 

    Check the No. D8 fuse . If the fuse is OK, repair an open in the IG1_FUEL_PUMP wire between the No. D8 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 (50P)

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

    Test condition Vehicle OFF (LOCK) mode
      PGM-FI main relay 2: disconnected
      PCM connector A (50P): disconnected
    Test point 1 PGM-FI main relay 2 4P socket (female terminals) No. 4:
    Test point 2 PCM connector A (50P) No. 11
    GHH378907Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    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 (A11) 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 (50P) No. 5
    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 (50P): disconnected
      PCM connector A (50P) No. 5: jumped to body ground
    Test point 1 PCM connector A (50P) No. 11
    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 (50P).

    -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:
    GHH378910Courtesy 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 .

  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
    GHH378912Courtesy 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:
    GHH378915Courtesy 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
    GHH378917Courtesy 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. Measure the resistance 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
    GHH378919Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    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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