DTC P0117: ECT Sensor 1 Circuit Low Voltage

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. 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. 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. 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 - Refer to: ECT Sensor 1 Removal and InstallationECT Sensor 2 Removal and Installation .

• 3. Shorted wire check (TW 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 B (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 B (51P): disconnected
  Test point 1	ECT sensor 1 2P connector No. 2
  Test point 2	Body ground

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

  Is there continuity?

  YES 

  Repair a short in the TW wire between the PCM (B50) and ECT sensor 1.

  NO 

  The TW wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0117 goes away and the PCM was updated, troubleshooting is complete. If DTC P0117 goes away and the PCM was substituted, replace the original PCM .