DTC P2185 (2014 2015 2016)

DTC P2185  : ECT Sensor 2 Circuit High 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 2	More than 4.92	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 2 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. Determine possible failure area (ECT sensor 2, others)

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

   - 2. Disconnect the following connector.

   ECT sensor 2 2P connector - Refer to: ECT Sensor 1 Removal and Installation, or ECT Sensor 2 Removal and Installation

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

   Terminal A	ECT sensor 2 2P connector No. 1 (GRN)
   Terminal B	ECT sensor 2 2P connector No. 2 (BLU)

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

   - 4. Turn the vehicle to the ON mode.

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

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   ECT SENSOR 2	More than 4.92	V

   Do the current condition(s) match the threshold?

   YES 

   Go to step 3.

   NO 

   Replace ECT sensor 2 - Refer to: ECT Sensor 1 Removal and Installation, or ECT Sensor 2 Removal and Installation .

3. Determine possible failure area (TW2 SNSR/TW2 line, SG7/SG line)

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

   - 2. Remove the jumper wire from the ECT sensor 2 2P connector.

   - 3. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	ECT sensor 2 2P connector: disconnected
   Test circuit	TW2 SNSR/TW2
   Test point 1	ECT sensor 2 2P connector No. 2 (BLU)
   Test point 2	Body ground

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

   Is there about 5.0 V?

   YES 

   The TW2 SNSR/TW2 line is OK. Go to step 4.

   NO 

   Go to step 5.

4. Open wire check (SG7/SG 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 A (51P) - Refer to: How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015)

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

   Test condition	Vehicle OFF (LOCK) mode
   	ECT sensor 2 2P connector: disconnected
   	PCM connector A (51P): disconnected
   Test circuit	SG7/SG
   Test point 2	ECT sensor 2 2P connector No. 1 (GRN)
   Test point 1	PCM connector A (51P) No. 20 (BLK)

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

   Is there continuity?

   YES 

   The SG7/SG wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016) .

   NO 

   Repair an open in the SG7/SG wire between the PCM (A20) and ECT sensor 2.

5. Open wire check (TW2 SNSR/TW2 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 A (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)

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

   Test condition	Vehicle OFF (LOCK) mode
   	ECT sensor 2 2P connector: disconnected
   	PCM connector A (51P): disconnected
   Test circuit	TW2 SNSR/TW2
   Test point 1	ECT sensor 2 2P connector No. 2 (BLU)
   Test point 2	PCM connector A (51P) No. 31 (RED)

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

   Is there continuity?

   YES 

   The TW2 SNSR/TW2 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016), or PCM Removal and Installation (2014 2015) .

   NO 

   Repair an open in the TW2 SNSR/TW2 wire between the PCM (A31) and ECT sensor 2.