DTC Troubleshooting: P0099
DTC P0099: IAT Sensor 2 Intermittent Interruption
NOTE:
Before you troubleshoot, review the general troubleshooting information.
Check for damage or corrosion at MAP sensor/IAT sensor 2 connector terminals.

DTC Description
Confirmed DTC
Pending DTC
P0099 IAT Sensor 2 Intermittent Interruption
    

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
P0099 IAT Sensor 2 Intermittent Interruption
    

Is DTC P0099 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.
Shorted wire check (TA line):

Shorted 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 connectors.
MAP sensor/IAT sensor 2 4P 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
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the TA wire between PCM connector No. 1 terminal No. 45 and MAP sensor/IAT sensor 2.?
     
NO
     
     
     
The TA wire is not shorted. Go to step 3.
3.
Open wire check (TA line):

Open wire check (TA line)
?1.
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. Go to step 4.
     
NO
     
     
     
Repair an open in the TA wire between PCM connector No. 1 terminal No. 45 and MAP sensor/IAT sensor 2.?
4.
Open wire check (SG5 line):

Open wire check (SG5 line)
?1.
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. Replace MAP sensor/IAT sensor 2.?
     
NO
     
     
     
Repair an open in the SG5 wire between PCM connector No. 1 terminal No. 29 and MAP sensor/IAT sensor 2.?