DTC P0118

DTC P0118  : ECT Sensor 1 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 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.

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 (GRY)
   Terminal B	ECT sensor 1 2P connector No. 2 (PNK)

   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 , then do the repair verification.

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

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

   -2. Remove the jumper wire from the ECT sensor 1 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 1 2P connector: disconnected
   Test circuit	TW
   Test point 1	ECT sensor 1 2P connector No. 2 (PNK)
   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 circuit	SG2
   Test point 1	ECT sensor 1 2P connector No. 1 (GRY)
   Test point 2	PCM connector B (51P) No. 45 (GRY)

   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 do the repair verification.

   NO 

   Repair an open in the SG2 wire between the PCM (B45) and ECT sensor 1, then do the repair verification.

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 circuit	TW
   Test point 1	ECT sensor 1 2P connector No. 2 (PNK)
   Test point 2	PCM connector C (51P) No. 48 (PNK)

   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 do the repair verification.

   NO 

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

6. 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
   P0118 ECT Sensor 1 Circuit High Voltage

   DTC (PGM-FI)

   Is DTC P0118 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.