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DTC P0117

DTC P0117  : ECT Sensor 1 Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .
DTC Description Confirmed DTC Pending DTC Freeze Frame
P0117 ECT Sensor 1 Circuit Low Voltage      

DTC (PGM-FI)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    -2. Check the parameter(s) below with the HDS.

    Signal Threshold Current conditions
    Values Unit Values Unit
    ECT SENSOR 1 Less than 0.08 V    

    Do the current condition(s) match the threshold?

    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 ECT sensor 1 and the PCM.

  2. ECT sensor 1 performance check

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

    -2. Disconnect the following connector.

    ECT sensor 1 2P connector

    -3. Turn the vehicle to the ON mode.

    -4. Check the parameter(s) below with the HDS.

    Signal Threshold Current conditions
    Values Unit Values Unit
    ECT SENSOR 1 Less than 0.08 V    

    Do the current condition(s) match the threshold?

    YES 

    Go to step 3.

    NO 

    Replace ECT sensor 1 , then do the repair verification.

  3. Shorted wire check (TW line)

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

    -2. Jump the SCS line with the HDS.

    -3. Disconnect the following connector.

    PCM connector C (51P)

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

    Test condition Vehicle OFF (LOCK) mode
      ECT sensor 1 2P connector: disconnected
      PCM connector C (51P): disconnected
    Test circuit TW
    Test point 1 ECT sensor 1 2P connector No. 2 (PNK)
    Test point 2 Body ground
    GHH344401Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the TW wire between the PCM (C48) and ECT sensor 1, then do the repair verification.

    NO 

    The TW wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

  4. Repair verification

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

    -2. Reconnect all connectors.

    -3. Exit the SCS mode with the HDS.

    -4. Turn the vehicle to the ON mode.

    -5. Reset the PCM with the HDS .

    Reset PCM

    -6. Do the PCM idle learn procedure.

    -7. Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC Freeze Frame
    P0117 ECT Sensor 1 Circuit Low Voltage      

    DTC (PGM-FI)

    Is DTC P0117 indicated?

    YES 

    Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM , then recheck. If the PCM was substituted, go to step 1.

    NO 

    Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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