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DTC P2602

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DTC P2602  : Electric Engine Coolant Pump Circuit Low Voltage

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

DTC Description Confirmed DTC Pending DTC
P2602 Electric Engine Coolant Pump Circuit Low Voltage    

DTC (PGM-FI)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    -2. Clear the DTC with the HDS.

    -3. Enter the maintenance mode, then start the engine .

    -4. Select the Electric Water Pump TEST in the Function Test Menu with the HDS.

    Electric Water Pump TEST

    Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC
    P2602 Electric Engine Coolant Pump Circuit Low Voltage    

    Is DTC P2602 indicated?

    YES 

    The failure is duplicated. Go to step 2.

    NO 

    Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the electric engine coolant 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. Fuse check

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

    -2. Check the following fuse.

    Fuse No. C1-6

    Is the fuse OK?

    YES 

    Go to step 6.

    NO 

    Go to step 3.

  3. Relay check

    -1. Remove the engine EWP relay .

    -2. Test the engine EWP relay .

    Is the relay OK?

    YES 

    Go to step 4.

    NO 

    Replace the engine EWP relay. Also replace the No. C1-6 fuse .

  4. Shorted wire check (+B_ENG_WATER_PUMP line)

    -1. Remove the blown No. C1-6 fuse .

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
    Test point 1 Engine EWP relay 4P socket (female terminals) No. 1 and No. 3:
    Test point 2 Body ground
    GHH378021Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Go to step 5.

    NO 

    Repair a short in the +B_ENG_WATER_PUMP wire between the No. C1-6 fuse and the engine EWP relay. Also replace the No. C1-6 fuse.

  5. Shorted wire check (IG1(EWP)/ENG W/PUMP RLY OUT line)

    -1. Disconnect the following connector.

    Electric engine coolant pump 5P connector

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      Electric engine coolant pump 5P connector: disconnected
    Test point 1 Engine EWP relay 4P socket (female terminals) No. 2:
    Test point 2 Body ground
    GHH378023Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Replace the electric engine coolant pump . Also replace the No. C1-6 fuse .

    NO 

    Repair a short in the IG1(EWP)/ENG W/PUMP RLY OUT wire between the engine EWP relay and the electric engine coolant pump. Also replace the No. C1-6 fuse.

  6. Relay check

    -1. Remove the engine EWP relay .

    -2. Test the engine EWP relay .

    Is the relay OK?

    YES 

    Go to step 7.

    NO 

    Replace the engine EWP relay.

  7. Open wire check (ENG W/PUMP RLY CL- line)

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

    -2. Disconnect the following connector.

    PCM connector A (50P)

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
    Test point 1 Engine EWP relay 4P socket (female terminals) No. 4:
    Test point 2 PCM connector A (50P) No. 24
    GHH378025Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 8.

    NO 

    Repair an open in the ENG W/PUMP RLY CL- wire between the PCM (A24) and the engine EWP relay.

  8. Open wire check (+B_ENG_WATER_PUMP line)

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
    Test point 1 Engine EWP relay 4P socket (female terminals) No. 1 and No. 3:
    Test point 2 Body ground
    GHH378027Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 9.

    NO 

    Repair an open in the +B_ENG_WATER_PUMP wire between the No. C1-6 fuse and the engine EWP relay.

  9. Open wire check (IG1(EWP)/ENG W/PUMP RLY OUT line)

    -1. Disconnect the following connector.

    Electric engine coolant pump 5P connector

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
      Electric engine coolant pump 5P connector: disconnected
    Test point 1 Engine EWP relay 4P socket (female terminals) No. 2:
    Test point 2 Electric engine coolant pump 5P connector (female terminals) No. 1:
    GHH378030Courtesy of HONDA, U.S.A., INC.
    GHH378031Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 10.

    NO 

    Repair an open in the IG1(EWP)/ENG W/PUMP RLY OUT wire between the engine EWP relay and the electric engine coolant pump.

  10. Open wire check (EWP_PG line)

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
      Electric engine coolant pump 5P connector: disconnected
    Test point 1 Electric engine coolant pump 5P connector (female terminals) No. 5:
    Test point 2 Body ground
    GHH378033Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 11.

    NO 

    Repair an open in the EWP_PG wire between the electric engine coolant pump and G102.

  11. Shorted wire check (EWP_C(SWP) line)

    -1. Disconnect the following connector.

    PCM connector E (80P)

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
      Electric engine coolant pump 5P connector: disconnected
      PCM connector E (80P): disconnected
    Test point 1 PCM connector E (80P) No. 29
    Test point 2 Body ground

    Is there 1 MΩ or more?

    YES 

    Go to step 12.

    NO 

    Repair a short in the EWP_C(SWP) wire between the PCM (E29) and the electric engine coolant pump.

  12. Shorted wire check (EWP_REV(NWP) line)

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
      Electric engine coolant pump 5P connector: disconnected
      PCM connector E (80P): disconnected
    Test point 1 PCM connector E (80P) No. 60
    Test point 2 Body ground

    Is there 1 MΩ or more?

    YES 

    The EWP_REV(NWP) wire is not shorted, go to step 13.

    NO 

    Repair a short in the EWP_REV(NWP) wire between the PCM (E60) and the electric engine coolant pump.

  13. Open wire check (EWP_REV(NWP) line)

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

    Test condition Vehicle OFF (LOCK) mode
      Engine EWP relay: disconnected
      PCM connector A (50P): disconnected
      Electric engine coolant pump 5P connector: disconnected
      PCM connector E (80P): disconnected
    Test point 1 Electric engine coolant pump 5P connector (female terminals) No. 2:
    Test point 2 PCM connector E (80P) No. 60
    GHH378035Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    The EWP_REV(NWP) wire is OK. Go to step 14.

    NO 

    Repair an open in the EWP_REV(NWP) wire between the PCM (E60) and the electric engine coolant pump.

  14. Electric engine coolant pump check

    -1. Substitute a known-good electric engine coolant pump .

    -2. Reconnect all connectors.

    -3. Exit the SCS mode with the HDS.

    -4. Turn the vehicle to the ON mode.

    -5. Clear the DTC with the HDS.

    -6. Enter the maintenance mode, then start the engine .

    -7. Select the Electric Water Pump TEST in the Function Test Menu with the HDS.

    Electric Water Pump TEST

    Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC
    P2602 Electric Engine Coolant Pump Circuit Low Voltage    

    Is DTC P2602 indicated?

    YES 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

    NO 

    Replace the original electric engine coolant pump .

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