DTC Troubleshooting: P2176
DTC P2176: Throttle Actuator Control System Idle Position Not Learned
Do not insert your fingers into the installed throttle body when you turn the vehicle to the ON mode, or while the vehicle is in ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P2176 Throttle Actuator Control System Idle Position Not Learned
    

1.
Problem verification:

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

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode, and wait 10 seconds.

?4.
Turn the vehicle to the ON mode.

?5.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P2176 Throttle Actuator Control System Idle Position Not Learned
    

Is DTC P2176 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 the throttle body and the PCM, then clean the throttle body. 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.
Throttle body operation check:

Throttle body operation check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the throttle body inlet pipe and the throttle body connector tube from the throttle body.

?3.
Turn the vehicle to the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Visually check the throttle valve operation while doing the ETCS TEST in the INSPECTION MENU with the HDS.

  

Does the throttle valve move to its fully closed position?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 4.
3.
Throttle body condition check:

Throttle body condition check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove the throttle body.

?3.
Check for sludge or carbon on the throttle valve.

Is there sludge or carbon on the throttle valve?

     
YES
     
     
     
     
NO
     
     
     
4.
Open wire check (MTR1 line, MTR2 line):

Open wire check (MTR1 line, MTR2 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.
PCM connector No. 1 (96P)
Throttle body 6P connector

?4.
Connect terminals A and B with a jumper wire.
Terminal A
Throttle body 6P connector (female terminals) No. 1:
Terminal B
Throttle body 6P connector (female terminals) No. 2:


?5.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector No. 1 (96P): disconnected
 
Throttle body 6P connector: disconnected
 
Throttle body 6P connector No. 1 and No. 2: jumped
Test point 1
PCM connector No. 1 (96P) No. 3
Test point 2
PCM connector No. 1 (96P) No. 8

Is there continuity?

     
YES
     
     
     
The MTR1 wire and the MTR2 wire are OK. Substitute a known-good throttle body, then recheck:?
If DTC P2176 is not indicated, replace the original throttle body.
If DTC P2176 is indicated again, replace the PCM.
     
NO
     
     
     
Repair an open in the MTR1 wire and/or the MTR2 wire between PCM connector No. 1 terminals (No. 3, No. 8) and the throttle body.?