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 press the engine start/stop button to select the ON mode, or while the vehicle is in the ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.

NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
If DTC P2135 is stored at the same time as DTC P2176, troubleshoot DTC P2135 first, then recheck for DTC P2176.

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

1.
Problem verification:

Problem verification
?1.
Press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Press the engine start/stop button to select the OFF mode.

?4.
Press the engine start/stop button to select the ON mode, and wait for 10 seconds.

?5.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
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.?
2.
Throttle body operation check:

Throttle body operation check
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the intake air duct from the throttle body.

?3.
Press the engine start/stop button to select 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.
Press the engine start/stop button to select the OFF 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.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connectors.

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


?5.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
PCM connector C (51P): disconnected
 
Throttle body 6P connector: disconnected
 
Throttle body 6P connector No. 1 and No. 2: jumped
Test circuit
MTR1, MTR2
Test point 1
PCM connector C (51P) No. 2 (LT BLU)
Test point 2
PCM connector C (51P) No. 3 (WHT)


Is there continuity?

     
YES
     
     
     
The MTR1 and MTR2 wires are OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
     
NO
     
     
     
Repair an open in the MTR1 wire and/or the MTR2 wire between the PCM (C2, C3) and the throttle body, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
Press the engine start/stop button to select the ON mode.

?5.
Reset the PCM with the HDS.


?6.
Do the PCM idle learn procedure.

?7.
Press the engine start/stop button to select the OFF mode.

?8.
Press the engine start/stop button to select the ON mode, and wait for 10 seconds.

?9.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2176 Throttle Actuator Control System Idle Position Not Learned
      


Is DTC P2176 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at the throttle body and the PCM, and clean the throttle body, then go to step 1. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?