DTC Troubleshooting: P0238
DTC P0238: Turbocharger Boost Sensor Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0238 Turbocharger Boost Sensor 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
TC BOOST PRESSURE SENSOR
More than 4.49
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 the turbocharger boost sensor 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 (turbocharger boost sensor, others):

Determine possible failure area (turbocharger boost sensor, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Turbocharger boost sensor 3P connector

?3.
Connect terminals A and B with a jumper wire.
Terminal A
Turbocharger boost sensor 3P connector No. 1
Terminal B
Turbocharger boost sensor 3P 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
TC BOOST PRESSURE SENSOR
More than 4.49
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Determine possible failure area (SG2 line, others):

Determine possible failure area (SG2 line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove the jumper wire from the turbocharger boost sensor 3P connector.

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Turbocharger boost sensor 3P connector: disconnected
Test point 1
Turbocharger boost sensor 3P connector No. 1
Test point 2
Turbocharger boost sensor 3P connector No. 3


Is there about 5.0 V?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 4.
4.
Open wire check (SG2 line):

Open wire check (SG2 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 E (80P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Turbocharger boost sensor 3P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
Turbocharger boost sensor 3P connector No. 1
Test point 2
PCM connector E (80P) No. 78


Is there continuity?

     
YES
     
     
     
The SG2 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 P0238 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the SG2 wire between the PCM (E78) and the turbocharger boost sensor.?
5.
Open wire check (P3 line):

Open wire check (P3 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 E (80P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Turbocharger boost sensor 3P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
Turbocharger boost sensor 3P connector No. 2
Test point 2
PCM connector E (80P) No. 57


Is there continuity?

     
YES
     
     
     
The P3 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 P0238 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the P3 wire between the PCM (E57) and the turbocharger boost sensor.?