DTC Troubleshooting: P0118
DTC P0118: ECT Sensor 1 Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0118 ECT Sensor 1 Circuit High Voltage
   

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0118 ECT Sensor 1 Circuit High Voltage
   

Is DTC P0118 indicated?

     
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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Determine possible failure area (ECT sensor 1, others):

Determine possible failure area (ECT sensor 1, others)
?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 (female terminals) No. 1:
Terminal B
ECT sensor 1 2P connector (female terminals) No. 2:


?4.
Turn the vehicle to the ON mode.

?5.
Clear the DTC with the HDS.


?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0118 ECT Sensor 1 Circuit High Voltage
   

Is DTC P0118 indicated?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Determine possible failure area (TW line, others):

Determine possible failure area (TW line, others)
?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 point 1
ECT sensor 1 2P connector (female terminals) No. 2:
Test point 2
Body ground


Is there about 5.0 V?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 5.
4.
Open wire check (SG3 line):

Open wire check (SG3 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 No. 1 (96P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
ECT sensor 1 2P connector: disconnected
 
PCM connector No. 1 (96P): disconnected
Test point 1
ECT sensor 1 2P connector (female terminals) No. 1:
Test point 2
PCM connector No. 1 (96P) No. 91


Is there continuity?

     
YES
     
     
     
The SG3 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0118 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the SG3 wire between PCM connector No. 1 terminal No. 91 and ECT sensor 1.?
5.
Open wire check (TW line):

Open 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 No. 1 (96P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
ECT sensor 1 2P connector: disconnected
 
PCM connector No. 1 (96P): disconnected
Test point 1
ECT sensor 1 2P connector (female terminals) No. 2:
Test point 2
PCM connector No. 1 (96P) No. 49


Is there continuity?

     
YES
     
     
     
The TW wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0118 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the TW wire between PCM connector No. 1 terminal No. 49 and ECT sensor 1.?