DTC Troubleshooting: P0098
DTC P0098: IAT Sensor 2 Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0098 IAT Sensor 2 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
P0098 IAT Sensor 2 Circuit High Voltage
    

Is DTC P0098 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 MAP sensor/IAT sensor 2 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 (IAT sensor 2, others):

Determine possible failure area (IAT sensor 2, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
MAP sensor/IAT sensor 2 4P connector

?3.
Connect terminals A and B with a jumper wire.
Terminal A
MAP sensor/IAT sensor 2 4P connector (female terminals) No. 1:
Terminal B
MAP sensor/IAT sensor 2 4P 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
P0098 IAT Sensor 2 Circuit High Voltage
    

Is DTC P0098 indicated?

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

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

?2.
Remove the jumper wire from the MAP sensor/IAT sensor 2 4P connector.

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
MAP sensor/IAT sensor 2 4P connector: disconnected
Test point 1
MAP sensor/IAT sensor 2 4P 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 (SG5 line):

Open wire check (SG5 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
 
MAP sensor/IAT sensor 2 4P connector: disconnected
 
PCM connector No. 1 (96P): disconnected
Test point 1
MAP sensor/IAT sensor 2 4P connector (female terminals) No. 1:
Test point 2
PCM connector No. 1 (96P) No. 29


Is there continuity?

     
YES
     
     
     
The SG5 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 P0098 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the SG5 wire between PCM connector No. 1 terminal No. 29 and MAP sensor/IAT sensor 2.?
5.
Open wire check (TA line):

Open wire check (TA 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
 
MAP sensor/IAT sensor 2 4P connector: disconnected
 
PCM connector No. 1 (96P): disconnected
Test point 1
MAP sensor/IAT sensor 2 4P connector (female terminals) No. 2:
Test point 2
PCM connector No. 1 (96P) No. 45


Is there continuity?

     
YES
     
     
     
The TA 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 P0098 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the TA wire between PCM connector No. 1 terminal No. 45 and MAP sensor/IAT sensor 2.?