DTC Troubleshooting: P2185
DTC P2185: ECT Sensor 2 Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2185 ECT Sensor 2 Circuit High Voltage
      

1.
Problem verification:

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):

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

?3.
Connect terminals A and B with a jumper wire.
Terminal A
ECT sensor 2 2P connector No. 1
Terminal B
ECT sensor 2 2P connector No. 2


?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
     
     
     
3.
Determine possible failure area (TW2 SENSOR line, others):

Determine possible failure area (TW2 SENSOR line, others)
?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 point 1
ECT sensor 2 2P connector No. 1
Test point 2
Body ground


Is there about 5.0 V?

     
YES
     
     
     
The TW2 SENSOR line is OK. Go to step 4.
     
NO
     
     
     
Go to step 5.
4.
Open wire check (SG5 line):

Open wire check (SG5 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)

?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 point 2
ECT sensor 2 2P connector No. 2
Test point 1
PCM connector A (51P) No. 39


Is there continuity?

     
YES
     
     
     
The SG5 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P2185 goes away and the PCM was updated, troubleshooting is complete. If DTC P2185 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the SG5 wire between the PCM (A39) and ECT sensor 2.?
5.
Open wire check (TW2 SENSOR line):

Open wire check (TW2 SENSOR 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)

?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 point 1
ECT sensor 2 2P connector No. 1
Test point 2
PCM connector A (51P) No. 43


Is there continuity?

     
YES
     
     
     
The TW2 SENSOR wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P2185 goes away and the PCM was updated, troubleshooting is complete. If DTC P2185 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the TW2 SENSOR wire between the PCM (A43) and ECT sensor 2.?