DTC P0118

DTC P0118  : ECT Sensor 1 Circuit High Voltage

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

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	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 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 check

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

   -2. Disconnect the following connector.

   ECT sensor 1 2P connector

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

   Terminal A	ECT sensor 1 2P connector No. 1
   Terminal B	ECT sensor 1 2P connector No. 2

   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 1	More than 4.92	V

   Do the current condition (s) match the threshold?

   YES 

   Go to step 3.

   NO 

   Replace ECT sensor 1 .

3. Determine possible failure area (TW line, SG2 line)

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

   -2. Remove the jumper wire.

   -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 1 2P connector: disconnected
   Test point 1	ECT sensor 1 2P connector No. 1
   Test point 2	Body ground

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

   Is there about 5.0 V?

   YES 

   Go to step 4.

   NO 

   Go to step 5.

4. Open wire check (SG2 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 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	PCM connector B (51P) No. 5
   Test point 2	ECT sensor 1 2P connector No. 2

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

   Is there continuity?

   YES 

   The SG2 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0118 goes away and the PCM was updated, troubleshooting is complete. If DTC P0118 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the SG2 wire between the PCM (B5) and ECT sensor 1.

5. Open 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 point 1	PCM connector C (51P) No. 41
   Test point 2	ECT sensor 1 2P connector No. 1

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

   Is there continuity?

   YES 

   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 P0118 goes away and the PCM was updated, troubleshooting is complete. If DTC P0118 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the TW wire between the PCM (C41) and ECT sensor 1.