DTC P2176

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
P2176: Throttle Actuator Control System – Idle Position Not Learned This DTC is detected if any one of the following conditions is met. •TP sensor (main) or TP sensor (sub) signal voltage at default position is out of specified range for specified time. •Electric throttle control system calibration is not completed. (1 D/C detection logic)	•TP sensor and/or its circuit •Electric throttle body assembly •ECM

Circuit Diagram

[A]:	ECM connector (View: [a])	B3:	TP sensor (sub) signal circuit	4.	Throttle actuator
A1:	Throttle actuator control circuit (close)	B4:	TP sensor ground circuit	5.	ECM
A2:	Throttle actuator control circuit (open)	1.	Electric throttle body assembly	6.	Shield wire
B1:	TP sensor power supply circuit	2.	TP sensor (main)
B2:	TP sensor (main) signal circuit	3.	TP sensor (sub)

DTC Confirmation Procedure

NOTE:

Check that the following conditions are met in this “DTC Confirmation Procedure”.

•Battery voltage > 10 V
•6°C (43°F) < ECT < 100°C (212°F)
•IAT-1 > 6°C (43°F)

1)Set ignition “ON” with accelerator pedal released for 1 min.

2)Set ignition “OFF”.

DTC Troubleshooting

Step	Action	Yes	No
1	Was “Engine and Emission Control System Check” performed?	Go to Step 2.	Go to Engine and Emission Control System Check:K14C.
2	Electric throttle control system calibration 1)Perform electric throttle control system calibration. 2)Recheck DTC. Is DTC P2176 still detected?	Go to Step 3.	End.
3	Wire harness check 1)Check the following points. •“B1”, “B2” and “B4” circuits: Refer to Step 2 – 4 under DTC P0122 / P0123:K14C. •“B3” circuit: Refer to Step 4 under DTC P0222 / P0223:K14C. Is check result OK?	Go to Step 4.	Repair or replace defective wire harness.
4	TP sensor check 1)Check TP sensor referring to “TP Sensor Performance Check” under Electric Throttle Body Assembly On-Vehicle Inspection:K14C. Is check result OK?	Replace ECM and recheck DTC.	Replace electric throttle body assembly.